{ "schema_version": "1.2.0", "registry": "datasets", "updated": "2026-09-30", "notice": "Dataset and source registry for the EMXplore Radio Astronomy project. Sources with visibility 'private' are research files that are not distributed. They are referenced only by opaque logical IDs; storage locations and checksums are kept in a private local-source manifest outside this public registry. Private project records are never quoted; they may only support neutral 'inferred' notes. Historical products keep their original calibration epoch (see calibration-epochs.json).", "data_levels": { "L0": "Native spectral acquisition: averaged power spectra as written by the acquisition software (NOT raw I/Q), or the same values resampled to a common grid (product_class resampled_spectra).", "L1": "Observation organisation: scan manifests, pointing tracks, session metadata.", "L2": "Reduced spectra: baseline/bandpass removed, quality-gated, still on a relative scale.", "L3": "Calibrated spectra: values on a temperature scale of a named calibration epoch.", "L4": "Spectral cubes: gridded position-position-velocity data.", "L5": "Derived science products: peak/velocity/moment maps, catalogues, velocity tables, fitted calibration constants.", "L6": "Curated / corrected products: selection rules, stray-radiation or other corrections, multi-session composites.", "L7": "Visualization: figures and renderings made from lower levels.", "L8": "Independently reproduced publication products: regenerated from L0/L1 by documented code with a recorded lineage." }, "sources": [ { "source_id": "src-cal-report-20260923", "kind": "research_file", "title": "DISH222 absolute brightness-temperature calibration report (23 Sep 2026)", "visibility": "private" }, { "source_id": "src-yfactor-record-20260902", "kind": "research_file", "title": "Y-factor calibration record written by the acquisition software (2 Sep 2026)", "visibility": "private" }, { "source_id": "src-kelvin-map-figure-20260901", "kind": "research_file", "title": "First kelvin-calibrated map of the 1 Sep 2026 scan (figure)", "visibility": "private" }, { "source_id": "src-lab-comparison-note-20260828", "kind": "research_file", "title": "DISH222 vs LAB survey comparison note (28 Aug 2026)", "visibility": "private" }, { "source_id": "src-session-archive-20260826", "kind": "research_file", "title": "26 Aug 2026 outer-Galaxy session archive (native spectra, raster manifest, stitched figures)", "visibility": "private" }, { "source_id": "src-fits-products-20260826", "kind": "research_file", "title": "26 Aug 2026 FITS products (cube, peak map, velocity map, catalog)", "visibility": "private" }, { "source_id": "src-fullband-table-20260826", "kind": "research_file", "title": "26 Aug 2026 un-baselined averaged spectra on a common grid (table)", "visibility": "private" }, { "source_id": "src-reduced-spectra-table-20260826", "kind": "research_file", "title": "26 Aug 2026 reduced spectra, dB above fitted baseline (table)", "visibility": "private" }, { "source_id": "src-workbook-20260826", "kind": "research_file", "title": "26 Aug 2026 workbook: measurements, spectra and session definitions", "visibility": "private" }, { "source_id": "src-velocity-table-20260826", "kind": "research_file", "title": "26 Aug 2026 strong-line LSR velocity table", "visibility": "private" }, { "source_id": "src-gc-products-20260902", "kind": "research_file", "title": "2 Sep 2026 galactic-centre area-scan products (FITS and figures)", "visibility": "private" }, { "source_id": "src-ac-products-20260903", "kind": "research_file", "title": "3 Sep 2026 anticentre-side scan products (FITS and figure)", "visibility": "private" }, { "source_id": "src-allsky-products", "kind": "research_file", "title": "All-sky TRUSTED composite products (FITS and LAB overlay figure)", "visibility": "private" }, { "source_id": "src-legacy-dish1-v69", "kind": "legacy_software", "title": "Legacy acquisition/control application, DISH1 V69 (operational snapshot)", "visibility": "private", "note": "Private legacy software snapshot; locators refer to line numbers in that snapshot." }, { "source_id": "src-legacy-dish222-v75", "kind": "legacy_software", "title": "Legacy acquisition/control application, DISH222 V75 one-app (operational snapshot)", "visibility": "private", "note": "Private legacy software snapshot; locators refer to line numbers in that snapshot." }, { "source_id": "src-phase0-audit", "kind": "project_record", "title": "Phase 0 audit report (analysis and measurements made during the audit)", "visibility": "private", "note": "Audit analysis of the supplied archive. Measurements made by the audit are flagged 'inferred'; statements about what the archive does or does not contain are documented." }, {"source_id": "src-project-decisions", "kind": "project_record", "title": "Project decisions log (D1-D5)", "visibility": "private"}, { "source_id": "src-private-project-records", "kind": "project_record", "title": "Private project records (restricted)", "visibility": "private", "evidence_limit": "inferred_only", "note": "May only support neutral inferred notes. AI-generated analyses contained in these records are not treated as evidence." }, { "source_id": "src-site-index", "kind": "public_site_page", "title": "Radio Astronomy member portal Start page", "visibility": "public", "path": "radio-astronomy/portal/start.html" }, { "source_id": "src-site-project", "kind": "public_site_page", "title": "PSU Fixed Telescope page: historical fixed system and signal chain (formerly part of the Project Story page)", "visibility": "public", "path": "radio-astronomy/portal/telescope-psu-fixed.html" }, { "source_id": "src-site-log", "kind": "public_site_page", "title": "Project Log page: background timeline (formerly part of the Project Story page)", "visibility": "public", "path": "radio-astronomy/portal/log.html" }, { "source_id": "src-site-lecture", "kind": "public_site_page", "title": "Interactive lecture (52 slides)", "visibility": "public", "path": "radio-astronomy/lecture.html" }, { "source_id": "src-ieee-2025", "kind": "external_publication", "title": "An Educational Radio Telescope Optimized for Hydrogen Line Astronomy (IEEE Antennas and Propagation Magazine 67(6):72-95, Dec 2025)", "visibility": "public", "doi": "10.1109/MAP.2025.3621127" } ], "datasets": [ { "dataset_id": "ds-20260826-og-native-spectra", "title": "26 Aug 2026 outer-Galaxy raster: native averaged spectra (776 NPZ)", "campaign": "2026-08-26-outer-galaxy", "instrument_id": "dish222", "observation_time": { "start": "2026-08-26T02:48:00Z", "end": "2026-08-26T05:48:00Z", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "NPZ __meta__ saved_utc_iso (first and last chunk)"}], "note": "Chunk timestamps are the save time at the END of each averaging window. The folder name '0547' is local time (UTC+3)." }, "target": { "value": "Outer Galaxy / outer spiral arm", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Session info: 'morning, outer arm'"}] }, "coverage": { "frame": "galactic", "lon_min_deg": 146, "lon_max_deg": 226, "lat_min_deg": -10, "lat_max_deg": 20, "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "raster manifest track"}] }, "observing_mode": { "value": "raster_scan", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "manifest 'mode': 'raster'"}] }, "coordinate_system": { "value": "not_applicable", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "NPZ keys"}], "note": "NPZ files carry no pointing; positions come from the manifest by time association." }, "velocity_frame": { "value": "topocentric", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "NPZ freqAxis (sky frequency)"}], "note": "Frequency axis only; no velocity correction applied." }, "velocity_definition": {"value": "not_applicable", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826"}]}, "spectral_line": { "name": "H I 21 cm", "rest_frequency_mhz": { "value": 1420.40575, "unit": "MHz", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "RESTFRQ = 1420405750.0 Hz"}] } }, "product_class": "native_spectra", "data_level": "L0", "file_formats": ["zip", "npz"], "native_availability": "available", "missing_source": false, "calibration_id": null, "calibration_assignment": { "value": "Uncalibrated power (arbitrary units); calibration-independent", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "NPZ avg_lin/avg_dB"}] }, "processing_status": { "value": "Welch-averaged power spectra only; schema A additionally divided by a stored background", "evidence": "documented", "sources": [ {"source_id": "src-session-archive-20260826", "locator": "NPZ keys and __meta__.bg_present"}, {"source_id": "src-legacy-dish222-v75", "locator": "lines 6160-6258, 12651-12713"} ] }, "portal_status": "reference", "recommended_for_students": true, "student_notes": "Strongest supplied end-to-end reproducible campaign: native spectra + manifest + every downstream product level. Recommended first dataset for reduction, repeatability and velocity work.", "scientific_purpose": { "value": "Map outer-arm H I brightness and velocity structure across l = 146-226 deg", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Session info"}, {"source_id": "src-lab-comparison-note-20260828", "locator": "section 1"}] }, "files": [ { "source_id": "src-session-archive-20260826", "artifact_id": "art-20260826-native-spectra-set", "role": "native_spectra", "data_level": "L0", "format": "npz", "member_count": 776, "note": "Two schemas: see facts. Checksums are held in the private local-source manifest." } ], "lineage": { "derived_from": [], "produced_by": { "value": "Legacy acquisition software (V62 native accumulator and original autosave path)", "evidence": "inferred", "sources": [{"source_id": "src-legacy-dish222-v75", "locator": "lines 6160-6258 and 12651-12713"}], "note": "Exact build used on 26 Aug is not recorded in the files; schema A/B match the two code paths." } }, "facts": [ { "key": "npz_schema_a_count", "value": 459, "unit": "count", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826"}], "note": "301 channels, 1420.10-1420.80 MHz, L_used 50, background-divided corr_lin/corr_dB present; spectral span follows the GUI zoom grid." }, { "key": "npz_schema_b_count", "value": 317, "unit": "count", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826"}], "note": "1024 channels, 1418.70-1421.10 MHz, L_used 10-70, no background." }, { "key": "centre_frequency_mhz", "value": 1419.9, "unit": "MHz", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "__meta__ fc_hz"}] }, { "key": "sample_rate_mhz", "value": 2.4, "unit": "MHz", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "__meta__ fs_hz"}] }, { "key": "recorded_gain_metadata", "value": "lna_db 20, vga_db 7", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "__meta__"}], "note": "Recorded values may not equal the hardware state (audit finding S7)." }, { "key": "stores_raw_iq", "value": false, "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "NPZ keys"}] } ], "limitations": [ {"value": "Not raw I/Q: Welch-averaged power spectra", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826"}]}, { "value": "lst_hours is 0.0 and device is empty in every file; NPZ files carry no pointing", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "__meta__"}] }, { "value": "__meta__ is a pickled object array (requires allow_pickle when reading)", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826"}] }, { "value": "Schema A background (corr) is on a different power scale (corr/avg about 0.005-0.007) and the background file is not supplied", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826"}] }, { "value": "HackRF sample-format conversion unverified", "evidence": "inferred", "sources": [{"source_id": "src-legacy-dish222-v75", "locator": "lines 826-860"}], "note": "Audit finding S1." }, { "value": "Morning session; the Sun may contribute through sidelobes late in the session", "evidence": "inferred", "sources": [{"source_id": "src-allsky-products", "locator": "FITS HISTORY 'dawn Sun band removed'"}], "note": "Only the all-sky product mentions a dawn Sun band; its effect on this session is not quantified." } ] }, { "dataset_id": "ds-20260826-og-raster-manifest", "title": "26 Aug 2026 outer-Galaxy raster manifest (313 waypoints)", "campaign": "2026-08-26-outer-galaxy", "instrument_id": "dish222", "observation_time": { "start": "2026-08-26T02:49:06Z", "end": "2026-08-26T05:19:26Z", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "manifest track[0].t and track[-1].t"}] }, "coverage": { "frame": "galactic", "lon_min_deg": 146, "lon_max_deg": 226, "lat_min_deg": -10, "lat_max_deg": 20, "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "manifest track"}], "note": "Longitude step 4 deg, latitude step 2 deg." }, "observing_mode": {"value": "raster_scan", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "manifest 'mode'"}]}, "coordinate_system": { "value": "galactic_and_equatorial", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "track keys l, b, ra_h, dec_d"}], "note": "Computed with fixed J2000 transformation constants in the legacy software." }, "product_class": "observation_manifest", "data_level": "L1", "file_formats": ["json"], "native_availability": "available", "missing_source": false, "calibration_id": null, "calibration_assignment": {"value": "Not applicable (pointing record)", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826"}]}, "portal_status": "reference", "recommended_for_students": true, "student_notes": "Use with the native spectra to associate each chunk with a sky position.", "files": [ { "source_id": "src-session-archive-20260826", "artifact_id": "art-20260826-raster-manifest", "role": "observation_manifest", "data_level": "L1", "format": "json" } ], "lineage": { "derived_from": [], "produced_by": { "value": "Legacy raster engine (incremental manifest writer)", "evidence": "documented", "sources": [{"source_id": "src-legacy-dish222-v75", "locator": "_v44_raster_save_manifest, lines 12064-12080"}] } }, "facts": [ {"key": "track_points", "value": 313, "unit": "count", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826"}]}, { "key": "partial", "value": false, "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "manifest 'partial'"}] } ], "limitations": [ { "value": "Positions are the COMMANDED waypoints, time-stamped at the end of each dwell; waypoints reached by timeout are not flagged", "evidence": "documented", "sources": [{"source_id": "src-legacy-dish222-v75", "locator": "lines 12023-12041"}] }, { "value": "created_utc is rewritten on each incremental save (05:19:28Z), not the start time", "evidence": "documented", "sources": [{"source_id": "src-legacy-dish222-v75", "locator": "line 12074"}] }, { "value": "No precession to date in the RA/Dec to Az/El step used for pointing (about 0.36 deg in 2026)", "evidence": "inferred", "sources": [{"source_id": "src-legacy-dish222-v75", "locator": "_v44_radec_to_azel_now, line 11855"}], "note": "Audit finding S13; magnitude estimated from general precession of about 50 arcsec per year." } ] }, { "dataset_id": "ds-20260826-og-fullband-resampled", "title": "26 Aug 2026 un-baselined averaged spectra resampled to a common grid (CSV)", "campaign": "2026-08-26-outer-galaxy", "instrument_id": "dish222", "observation_time": { "start": "2026-08-26T02:48:00Z", "end": "2026-08-26T05:21:40Z", "evidence": "inferred", "sources": [{"source_id": "src-fits-products-20260826", "locator": "DATE-OBS / DATE-END"}], "note": "Same 661 accepted chunks as the FITS catalog." }, "coverage": { "frame": "galactic", "lon_min_deg": 146, "lon_max_deg": 226, "lat_min_deg": -10, "lat_max_deg": 20, "evidence": "documented", "sources": [{"source_id": "src-fullband-table-20260826", "locator": "gal_l_deg, gal_b_deg columns"}] }, "observing_mode": {"value": "raster_scan", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "manifest"}]}, "coordinate_system": {"value": "galactic_and_equatorial", "evidence": "documented", "sources": [{"source_id": "src-fullband-table-20260826", "locator": "header"}]}, "velocity_frame": { "value": "topocentric", "evidence": "documented", "sources": [{"source_id": "src-fullband-table-20260826", "locator": "frequency columns 1418.70000-1421.10000 MHz"}] }, "product_class": "resampled_spectra", "data_level": "L0", "file_formats": ["csv"], "native_availability": "available", "missing_source": false, "calibration_id": null, "calibration_assignment": { "value": "Uncalibrated averaged power in dB", "evidence": "inferred", "sources": [{"source_id": "src-fullband-table-20260826"}, {"source_id": "src-session-archive-20260826"}], "note": "Values equal the NPZ avg_dB within about 0.01 dB after regridding (checked on sample rows in the Phase 0 audit)." }, "processing_status": { "value": "Native avg_dB interpolated onto 1418.700-1421.100 MHz; channels outside each chunk's span left empty; accepted-chunk subset (661 of 776)", "evidence": "inferred", "sources": [{"source_id": "src-fullband-table-20260826"}, {"source_id": "src-phase0-audit", "locator": "section C.2 DS-2"}], "note": "392 rows come from 301-channel chunks, 269 rows from 1024-channel chunks." }, "portal_status": "reference", "recommended_for_students": true, "student_notes": "Easiest entry to the native values without reading NPZ files. Despite being labelled 'raw', this is not raw SDR data.", "files": [{"source_id": "src-fullband-table-20260826", "role": "resampled_spectra", "data_level": "L0", "format": "csv"}], "lineage": { "derived_from": ["ds-20260826-og-native-spectra", "ds-20260826-og-raster-manifest"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "limitations": [ { "value": "Labelled 'raw' but contains averaged power spectra, not raw SDR samples", "evidence": "documented", "sources": [{"source_id": "src-fullband-table-20260826"}] }, { "value": "The chunk acceptance rule (661 of 776) is described but its code is not supplied", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Session info 'Chunks'"}] } ] }, { "dataset_id": "ds-20260826-og-reduced-spectra", "title": "26 Aug 2026 reduced spectra, dB above fitted baseline (CSV, 701 channels)", "campaign": "2026-08-26-outer-galaxy", "instrument_id": "dish222", "observation_time": { "start": "2026-08-26T02:48:00Z", "end": "2026-08-26T05:21:40Z", "evidence": "inferred", "sources": [{"source_id": "src-fits-products-20260826", "locator": "DATE-OBS / DATE-END"}], "note": "Same 661 accepted chunks." }, "coverage": { "frame": "galactic", "lon_min_deg": 146, "lon_max_deg": 226, "lat_min_deg": -10, "lat_max_deg": 20, "evidence": "documented", "sources": [{"source_id": "src-reduced-spectra-table-20260826"}] }, "observing_mode": {"value": "raster_scan", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "manifest"}]}, "coordinate_system": { "value": "galactic_and_equatorial", "evidence": "documented", "sources": [{"source_id": "src-reduced-spectra-table-20260826", "locator": "header"}] }, "velocity_frame": { "value": "topocentric", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Session info 'Velocity conversion'"}] }, "product_class": "reduced_spectra", "data_level": "L2", "file_formats": ["csv"], "native_availability": "available", "missing_source": false, "calibration_id": "C0", "calibration_assignment": { "value": "dB above fitted baseline (relative)", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Session info 'Spectrum definition'"}] }, "processing_status": { "value": "Bandpass self-flattening and line-free re-zeroing; not smoothed; not notched (1420.000 MHz spur visible, ignore 1419.96-1420.04 MHz); grid 1419.300-1421.050 MHz at 2.5 kHz", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Session info"}] }, "portal_status": "historical", "recommended_for_students": true, "student_notes": "Target product for the independent-reduction track: reproduce it from the native spectra and document every difference.", "files": [{"source_id": "src-reduced-spectra-table-20260826", "role": "reduced_spectra", "data_level": "L2", "format": "csv"}], "lineage": { "derived_from": ["ds-20260826-og-native-spectra", "ds-20260826-og-raster-manifest"], "produced_by": { "value": "External processing following the V65 method (code not supplied)", "evidence": "inferred", "sources": [{"source_id": "src-workbook-20260826", "locator": "Session info"}], "note": "No CSV writer exists in the legacy applications." } }, "limitations": [ { "value": "Depends on the bandpass template, which may have been persisted from other sessions and was not supplied", "evidence": "inferred", "sources": [{"source_id": "src-legacy-dish222-v75", "locator": "lines 13663-13715"}], "note": "Audit finding S8." } ] }, { "dataset_id": "ds-20260826-og-measurements-workbook", "title": "26 Aug 2026 workbook: per-chunk measurements, spectra and session definitions (XLSX)", "campaign": "2026-08-26-outer-galaxy", "instrument_id": "dish222", "observation_time": { "start": "2026-08-26T02:48:00Z", "end": "2026-08-26T05:21:40Z", "evidence": "inferred", "sources": [{"source_id": "src-workbook-20260826", "locator": "Measurements 'UTC date-time'"}], "note": "Same 661 accepted chunks." }, "coverage": { "frame": "galactic", "lon_min_deg": 146, "lon_max_deg": 226, "lat_min_deg": -10, "lat_max_deg": 20, "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Measurements"}] }, "observing_mode": {"value": "raster_scan", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "manifest"}]}, "coordinate_system": { "value": "galactic_and_equatorial", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Measurements columns"}] }, "velocity_frame": { "value": "LSR_kind_unspecified", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Session info 'Velocity conversion'"}], "note": "Barycentric correction plus 20 km/s toward 18h03m50s +30d00m17s (standard solar motion)." }, "velocity_definition": { "value": "peak_of_smoothed_spectrum", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Session info 'Measurements sheet'"}], "note": "Peak of the 100 kHz-smoothed spectrum within 1420.15-1420.95 MHz." }, "spectral_line": { "name": "H I 21 cm", "rest_frequency_mhz": { "value": 1420.40575, "unit": "MHz", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Session info 'Velocity conversion'"}] } }, "product_class": "derived_science_product", "data_level": "L5", "additional_levels": ["L2"], "file_formats": ["xlsx"], "native_availability": "available", "missing_source": false, "calibration_id": "C0", "calibration_assignment": { "value": "Peak power in dB above baseline (relative)", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Measurements 'HI peak power (dB)'"}] }, "portal_status": "historical", "recommended_for_students": true, "student_notes": "Contains worked velocity conversions (topocentric, barycentric correction, LSR) that make good regression checks.", "files": [ { "source_id": "src-workbook-20260826", "role": "derived_table", "data_level": "L5", "format": "xlsx", "note": "Sheets: Measurements (661 rows, L5), Spectra dB (351 channels at 5 kHz, L2), Session info." } ], "lineage": { "derived_from": ["ds-20260826-og-native-spectra", "ds-20260826-og-raster-manifest"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "facts": [ { "key": "accepted_chunks", "value": 661, "unit": "count", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Session info 'Chunks: 661 clean (of 776 recorded)'"}] }, { "key": "strong_line_rows", "value": 453, "unit": "count", "evidence": "documented", "sources": [{"source_id": "src-workbook-20260826", "locator": "Measurements 'strong line (>=0.3 dB)' = YES"}] } ], "limitations": [ { "value": "Peak-velocity metric compresses the Galactic rotation amplitude (reported about 4x) because it follows the brightest, usually local, component", "evidence": "documented", "sources": [{"source_id": "src-lab-comparison-note-20260828", "locator": "section 2.2"}] } ] }, { "dataset_id": "ds-20260826-og-velocity-table", "title": "26 Aug 2026 strong-line LSR velocity table (CSV)", "campaign": "2026-08-26-outer-galaxy", "instrument_id": "dish222", "observation_time": { "start": "2026-08-26T02:48:00Z", "end": "2026-08-26T05:21:40Z", "evidence": "inferred", "sources": [{"source_id": "src-workbook-20260826"}], "note": "Subset of the workbook measurements." }, "coverage": { "frame": "galactic", "lon_min_deg": 146, "lon_max_deg": 226, "lat_min_deg": -10, "lat_max_deg": 20, "evidence": "documented", "sources": [{"source_id": "src-velocity-table-20260826"}] }, "coordinate_system": {"value": "galactic", "evidence": "documented", "sources": [{"source_id": "src-velocity-table-20260826", "locator": "header"}]}, "velocity_frame": { "value": "LSR_kind_unspecified", "evidence": "documented", "sources": [{"source_id": "src-velocity-table-20260826", "locator": "column v_lsr_kms"}] }, "velocity_definition": { "value": "peak_of_smoothed_spectrum", "evidence": "inferred", "sources": [{"source_id": "src-workbook-20260826"}], "note": "Values match the workbook's peak-based v_LSR." }, "product_class": "derived_science_product", "data_level": "L5", "file_formats": ["csv"], "native_availability": "available", "missing_source": false, "calibration_id": "C0", "calibration_assignment": { "value": "hi_peak_db in dB above baseline (relative)", "evidence": "documented", "sources": [{"source_id": "src-velocity-table-20260826", "locator": "column hi_peak_db"}] }, "portal_status": "historical", "recommended_for_students": true, "files": [{"source_id": "src-velocity-table-20260826", "role": "derived_table", "data_level": "L5", "format": "csv"}], "lineage": { "derived_from": ["ds-20260826-og-measurements-workbook"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "facts": [{"key": "rows", "value": 452, "unit": "count", "evidence": "documented", "sources": [{"source_id": "src-velocity-table-20260826"}]}], "limitations": [ { "value": "452 rows versus 453 'strong line' rows in the workbook: one-row discrepancy", "evidence": "documented", "sources": [{"source_id": "src-velocity-table-20260826"}, {"source_id": "src-workbook-20260826"}] }, { "value": "Peak-velocity metric; see the workbook limitation", "evidence": "documented", "sources": [{"source_id": "src-lab-comparison-note-20260828", "locator": "section 2.2"}] } ] }, { "dataset_id": "ds-20260826-og-fits-cube", "title": "26 Aug 2026 outer-Galaxy spectral cube in dB (FITS)", "campaign": "2026-08-26-outer-galaxy", "instrument_id": "dish222", "observation_time": { "start": "2026-08-26T02:48:00", "end": "2026-08-26T05:21:40", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "DATE-OBS / DATE-END ('first chunk UTC')"}], "note": "UTC per header comment." }, "coverage": { "frame": "galactic", "lon_min_deg": 146, "lon_max_deg": 228, "lat_min_deg": -12, "lat_max_deg": 22, "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "CRVAL/CDELT/NAXIS (165 x 69 at 0.5 deg)"}] }, "observing_mode": {"value": "raster_scan", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "manifest"}]}, "coordinate_system": { "value": "galactic", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "CTYPE1/2 GLON-CAR, GLAT-CAR"}] }, "velocity_frame": {"value": "LSRK", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "SPECSYS"}]}, "spectral_line": { "name": "H I 21 cm", "rest_frequency_mhz": {"value": 1420.40575, "unit": "MHz", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "RESTFRQ"}]} }, "product_class": "derived_science_product", "data_level": "L4", "file_formats": ["zip", "fits"], "native_availability": "available", "missing_source": false, "calibration_id": "C0", "calibration_assignment": { "value": "BUNIT dB, 'HI line power above baseline (uncalibrated)'. A header comment gives the C1 conversion T_B ~ T_sys*(10^(dB/10)-1) with T_sys_eff 330-480 K, but values are not converted.", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "BUNIT and COMMENT cards"}] }, "processing_status": { "value": "V65/V67 pipeline: bandpass self-flattened, baseline removed; velocity axis -120..+60 km/s at 1 km/s", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "COMMENT; CRVAL3/CDELT3/NAXIS3"}] }, "portal_status": "historical", "recommended_for_students": true, "student_notes": "Opened in SAOImage DS9 by the project; good for learning cubes, channel maps and WCS.", "files": [{"source_id": "src-fits-products-20260826", "artifact_id": "art-20260826-cube", "role": "spectral_cube", "data_level": "L4", "format": "fits"}], "lineage": { "derived_from": ["ds-20260826-og-reduced-spectra"], "produced_by": { "value": "External processing ('V65/V67 pipeline'); code not supplied", "evidence": "inferred", "sources": [{"source_id": "src-fits-products-20260826", "locator": "COMMENT"}], "note": "No FITS writer exists in the legacy applications." } }, "facts": [ { "key": "finite_fraction", "value": 0.802, "unit": "dimensionless", "evidence": "inferred", "sources": [{"source_id": "src-phase0-audit", "locator": "section C.2"}], "note": "Measured in the Phase 0 audit." }, { "key": "pointing_residual_deg", "value": 1.1, "unit": "deg", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "COMMENT 'Pointing calibrated via Sun shadow 25 Aug 2026'"}] } ], "limitations": [ { "value": "Uncalibrated (dB); comparisons in kelvin require an explicit epoch", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "BUNIT"}] }, { "value": "Beam FWHM given as approximately 3 deg (not measured)", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "BMAJ"}] } ] }, { "dataset_id": "ds-20260826-og-fits-maps", "title": "26 Aug 2026 peak map, peak-velocity map and catalog (FITS)", "campaign": "2026-08-26-outer-galaxy", "instrument_id": "dish222", "observation_time": { "start": "2026-08-26T02:48:00", "end": "2026-08-26T05:21:40", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "DATE-OBS / DATE-END"}], "note": "UTC per header comment." }, "coverage": { "frame": "galactic", "lon_min_deg": 146, "lon_max_deg": 228, "lat_min_deg": -12, "lat_max_deg": 22, "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "WCS"}] }, "coordinate_system": {"value": "galactic", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "CTYPE1/2"}]}, "velocity_frame": { "value": "LSRK", "evidence": "inferred", "sources": [{"source_id": "src-fits-products-20260826", "locator": "velocity BUNIT 'LSR velocity of the HI peak'"}], "note": "SPECSYS appears only in the cube header." }, "velocity_definition": { "value": "peak_of_smoothed_spectrum", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "velocity map BUNIT comment 'LSR velocity of the HI peak'"}] }, "product_class": "derived_science_product", "data_level": "L5", "file_formats": ["zip", "fits"], "native_availability": "available", "missing_source": false, "calibration_id": "C0", "calibration_assignment": { "value": "Peak in dB (relative)", "evidence": "documented", "sources": [{"source_id": "src-fits-products-20260826", "locator": "peak map BUNIT"}] }, "portal_status": "historical", "recommended_for_students": true, "files": [ { "source_id": "src-fits-products-20260826", "artifact_id": "art-20260826-peak-map", "role": "derived_map", "data_level": "L5", "format": "fits" }, { "source_id": "src-fits-products-20260826", "artifact_id": "art-20260826-velocity-map", "role": "derived_map", "data_level": "L5", "format": "fits" }, { "source_id": "src-fits-products-20260826", "artifact_id": "art-20260826-catalog", "role": "catalog", "data_level": "L5", "format": "fits", "note": "BINTABLE, 661 rows: UTC, RA, DEC, GLON, GLAT, PEAK_DB, VLSR." } ], "lineage": { "derived_from": ["ds-20260826-og-fits-cube", "ds-20260826-og-measurements-workbook"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "limitations": [ { "value": "Peak-velocity metric (see workbook); not comparable with the first-moment velocity maps of 2-3 Sep", "evidence": "documented", "sources": [ {"source_id": "src-fits-products-20260826", "locator": "velocity BUNIT"}, {"source_id": "src-gc-products-20260902", "locator": "velocity HISTORY 'intensity-weighted LSR velocity'"} ] } ] }, { "dataset_id": "ds-20260826-og-stitched-figures", "title": "26 Aug 2026 stitched sky-chart and strip figures from the legacy stitcher", "campaign": "2026-08-26-outer-galaxy", "instrument_id": "dish222", "observation_time": { "start": "2026-08-26T02:48:00Z", "end": "2026-08-26T05:48:00Z", "evidence": "inferred", "sources": [{"source_id": "src-session-archive-20260826"}], "note": "Made from the session folder; figures generated 26 Aug and re-generated 27 Aug." }, "coverage": { "frame": "equatorial", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "stitched sky-chart figure (RA/Dec)"}] }, "product_class": "visualization", "data_level": "L7", "file_formats": ["png"], "native_availability": "available", "missing_source": false, "calibration_id": "C0", "calibration_assignment": { "value": "H I line peak in dB above baseline", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "stitched sky-chart colour bar"}] }, "portal_status": "historical", "recommended_for_students": false, "student_notes": "Processing diagnostic (313 beam-stacked positions, V65 flatten+stack).", "files": [ { "source_id": "src-session-archive-20260826", "artifact_id": "art-20260826-skymap-figure-a", "role": "visualization", "data_level": "L7", "format": "png" }, { "source_id": "src-session-archive-20260826", "artifact_id": "art-20260826-skymap-figure-b", "role": "visualization", "data_level": "L7", "format": "png", "note": "Byte-identical to the 26 Aug file." }, { "source_id": "src-session-archive-20260826", "artifact_id": "art-20260826-strip-figure-a", "role": "visualization", "data_level": "L7", "format": "png" }, { "source_id": "src-session-archive-20260826", "artifact_id": "art-20260826-strip-figure-b", "role": "visualization", "data_level": "L7", "format": "png", "note": "Byte-identical to the 26 Aug file." } ], "public_assets": [ { "asset_id": "pub-fig-20260826-outer-galaxy-skymap", "path": "radio-astronomy/assets/images/research/dish222-2026-08-26-outer-galaxy-skymap.png", "media_type": "image/png", "sha256": "855ffc90cc245e35924acf3153f1ec9c4183b25fe7c90e296d1a0b67b2c20d48", "bytes": 556907, "rendition": "Resized to 1600 px width and re-encoded as PNG without embedded metadata.", "calibration": { "calibration_id": "C0", "epoch_status": "historical", "evidence": "documented", "sources": [{"source_id": "src-session-archive-20260826", "locator": "stitched sky-chart colour bar"}] }, "caption": "26 Aug 2026 outer-Galaxy raster projected on the sky: 313 beam-stacked positions, H I line peak in dB above the fitted baseline (C0, relative scale). Generated by the legacy stitcher on the day of the observation. A historical relative-scale product, not a temperature map.", "alt": "Sky chart in right ascension and declination with the Galactic plane as a red curve; a contour map of H I line peak in dB covers the outer-Galaxy region near RA 4-8 h scanned on 26 Aug 2026.", "used_on": ["index.html", "portal/data.html"] } ], "lineage": { "derived_from": ["ds-20260826-og-native-spectra", "ds-20260826-og-raster-manifest"], "produced_by": { "value": "Legacy V65 stitcher inside the acquisition app", "evidence": "documented", "sources": [{"source_id": "src-legacy-dish222-v75", "locator": "_v44_run_stitch, _v44_build_skymap"}] } }, "limitations": [ { "value": "Stitched galaxy-scan figure shows only a small part of the session in its time axis", "evidence": "inferred", "sources": [{"source_id": "src-session-archive-20260826"}], "note": "Visual inspection in the Phase 0 audit." } ] }, { "dataset_id": "ds-20260901-gc-kelvin-map-figure", "title": "First kelvin-calibrated map of the 1 Sep 2026 scan with LAB comparison (figure)", "campaign": "2026-09-01-galactic-plane", "instrument_id": "dish222", "observation_time": { "start": "2026-09-01", "end": "2026-09-01", "evidence": "documented", "sources": [{"source_id": "src-kelvin-map-figure-20260901", "locator": "title 'DISH222 1 Sep scan'"}] }, "coverage": { "frame": "galactic", "lon_min_deg": -30, "lon_max_deg": 25, "lat_min_deg": -15, "lat_max_deg": 60, "evidence": "inferred", "sources": [{"source_id": "src-kelvin-map-figure-20260901", "locator": "map axes"}], "note": "Read approximately from the figure axes." }, "product_class": "visualization", "data_level": "L7", "file_formats": ["png"], "native_availability": "derived_only", "missing_source": true, "calibration_id": "C2", "calibration_assignment": { "value": "Based on the 1 Sep 2026 observation, re-derived using the C2 calibration established on 2 Sep 2026 (T_sys = 179.5 K; eta = 0.30 from the LAB comparison). Historical; not on the current C4 scale.", "evidence": "documented", "sources": [{"source_id": "src-kelvin-map-figure-20260901", "locator": "title and panel legends"}] }, "rederivation": { "of_dataset_id": "ds-20260901-gc-plane-scan", "original_calibration_id": null, "created": "2026-09-02", "created_by": "DISH222 project, historically (before this registry existed)", "method_note": "The 2 Sep Y-factor T_sys was applied retroactively to the 1 Sep scan, and eta = 0.30 was derived from this same map's comparison with LAB. Recorded as a historical re-derivation so the retroactive use stays visible." }, "portal_status": "historical", "recommended_for_students": false, "student_notes": "Calibration diagnostic of the superseded C2 epoch. It shows where eta = 0.30 came from.", "files": [{"source_id": "src-kelvin-map-figure-20260901", "role": "visualization", "data_level": "L7", "format": "png"}], "public_assets": [ { "asset_id": "pub-fig-20260901-kelvin-map", "path": "radio-astronomy/portal/assets/images/research/dish222-2026-09-01-kelvin-map-c2.png", "media_type": "image/png", "sha256": "136d59f9e2a59692241d80a21bad4cba716bc226174f43e662686397dea7b2fd", "bytes": 410513, "rendition": "Resized to 1600 px width and re-encoded as PNG without embedded metadata.", "calibration": { "calibration_id": "C2", "epoch_status": "historical", "evidence": "documented", "sources": [ {"source_id": "src-kelvin-map-figure-20260901", "locator": "title and panel legends"}, {"source_id": "src-yfactor-record-20260902", "locator": "date"} ], "note": "Based on the 1 Sep 2026 observation; re-derived using the C2 calibration established on 2 Sep 2026." }, "caption": "Peak H I brightness map based on the 1 Sep 2026 observation, re-derived using the C2 calibration established on 2 Sep 2026 (T_sys = 179.5 K, eta = 0.30), with a comparison against the LAB survey. Historical product: it is not on the current C4 scale.", "alt": "Map of H I peak brightness in kelvin over Galactic longitude -30 to 25 deg and latitude -15 to 60 deg, with two panels comparing DISH222 with the LAB survey.", "used_on": ["portal/calibration.html"] } ], "lineage": { "derived_from": ["ds-20260901-gc-plane-scan"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "provenance_notes": [ { "value": "The figure file is supplied; the 1 Sep data it is made from are not.", "evidence": "documented", "sources": [{"source_id": "src-kelvin-map-figure-20260901"}] } ], "limitations": [ { "value": "A calibration measured on 2 Sep is applied to a 1 Sep scan", "evidence": "documented", "sources": [{"source_id": "src-kelvin-map-figure-20260901", "locator": "title"}, {"source_id": "src-yfactor-record-20260902", "locator": "date"}] }, {"value": "Superseded calibration epoch (C2)", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923"}]} ] }, { "dataset_id": "ds-20260902-cal-yfactor-record", "title": "2 Sep 2026 wall-to-zenith Y-factor calibration record", "campaign": "2026-09-02-calibration", "instrument_id": "dish222", "observation_time": { "start": "2026-09-02T11:13:14", "end": "2026-09-02T11:13:14", "evidence": "documented", "sources": [{"source_id": "src-yfactor-record-20260902", "locator": "date"}], "note": "Local time without zone, as written by the software." }, "observing_mode": { "value": "hot_cold_calibration", "evidence": "documented", "sources": [{"source_id": "src-legacy-dish222-v75", "locator": "V70, lines 16849-16858"}] }, "product_class": "calibration_record", "data_level": null, "file_formats": ["json"], "native_availability": "not_applicable", "missing_source": false, "calibration_id": "C2", "calibration_assignment": {"value": "Defines C2 T_sys", "evidence": "documented", "sources": [{"source_id": "src-yfactor-record-20260902"}]}, "portal_status": "historical", "recommended_for_students": true, "student_notes": "Recompute T_sys from p_wall and p_zenith with both Y-factor formulas (179.6 K versus 171.6 K).", "files": [{"source_id": "src-yfactor-record-20260902", "role": "calibration_record", "data_level": null, "format": "json"}], "lineage": { "derived_from": [], "produced_by": { "value": "V70 Kelvin calibration in a build before V72", "evidence": "inferred", "sources": [{"source_id": "src-legacy-dish222-v75", "locator": "V70/V72"}], "note": "The record lacks the eta_mb key that V72+ builds write." } }, "facts": [ { "key": "y_factor_db", "value": 4.4, "unit": "dB", "evidence": "documented", "sources": [{"source_id": "src-yfactor-record-20260902", "locator": "y_db"}] }, { "key": "t_wall_degc", "value": 50.0, "evidence": "documented", "sources": [{"source_id": "src-yfactor-record-20260902", "locator": "t_wall_C"}] }, { "key": "p_wall_over_p_zenith", "value": 2.7555, "unit": "dimensionless", "evidence": "inferred", "sources": [{"source_id": "src-yfactor-record-20260902", "locator": "p_wall, p_zenith"}], "note": "Ratio computed from the recorded powers; equals 4.40 dB." } ], "limitations": [ { "value": "Superseded; see C2 limitations in calibration-epochs.json", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923"}] } ] }, { "dataset_id": "ds-20260902-gc-ta-cube", "title": "2 Sep 2026 galactic-centre area scan: antenna-temperature cube (FITS)", "campaign": "2026-09-02-galactic-center", "instrument_id": "dish222", "observation_time": { "start": "2026-09-02", "end": "2026-09-02", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "product naming and products-figure title '2 Sep 2026 area scan'"}], "note": "Time of day not recorded in the FITS headers (no DATE-OBS)." }, "target": { "value": "Galactic-centre region", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "products-figure title"}] }, "coverage": { "frame": "equatorial", "lon_min_deg": 240, "lon_max_deg": 297, "lat_min_deg": -31, "lat_max_deg": -1, "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "cube_TA WCS (39 x 61 at 1.5 x 0.5 deg)"}], "note": "RA 16.0-19.8 h." }, "observing_mode": { "value": "area_scan", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "products-figure title 'area scan'"}] }, "coordinate_system": { "value": "equatorial_equinox_unspecified", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "CTYPE RA---CAR/DEC--CAR; no RADESYS/EQUINOX"}] }, "velocity_frame": { "value": "LSR_kind_unspecified", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "HISTORY '... LSR'"}], "note": "No SPECSYS keyword." }, "spectral_line": {"name": "H I 21 cm"}, "product_class": "calibrated_product", "data_level": "L4", "additional_levels": ["L3"], "file_formats": ["zip", "fits"], "native_availability": "derived_only", "missing_source": true, "calibration_id": "C2", "calibration_assignment": { "value": "BUNIT K; TSYS = 179.5 'wall-zenith Y-factor cal 2026-09-02'; cube values are T_A = f x T_sys", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "cube_TA header"}] }, "processing_status": { "value": "RFI-excised, centre-mode baseline, de-ramped, LSR; velocity axis -120..+60 km/s at 1 km/s", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "HISTORY; axis 3"}] }, "portal_status": "historical", "recommended_for_students": true, "student_notes": "Historical C2 product. Because the cube is T_A = f x 179.5 K, f can be recovered and a NEW, separately labelled C4 re-derivation created (never overwrite this product).", "scientific_purpose": { "value": "H I brightness and velocity field around the Galactic centre", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "figure titles"}] }, "files": [ { "source_id": "src-gc-products-20260902", "artifact_id": "art-20260902-ta-cube", "role": "calibrated_cube", "data_level": "L4", "format": "fits" } ], "lineage": { "derived_from": ["ds-20260902-gc-native-spectra"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "facts": [ { "key": "finite_fraction", "value": 0.645, "unit": "dimensionless", "evidence": "inferred", "sources": [{"source_id": "src-phase0-audit", "locator": "section C.2 DS-4"}], "note": "Measured in the Phase 0 audit." } ], "limitations": [ { "value": "Native spectra and manifest not supplied: cannot be re-reduced", "evidence": "documented", "sources": [{"source_id": "src-phase0-audit", "locator": "section C"}] }, { "value": "Header lacks DATE-OBS, TELESCOP, RESTFRQ, SPECSYS and equinox", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "headers"}] }, {"value": "Superseded calibration epoch (C2)", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923"}]} ] }, { "dataset_id": "ds-20260902-gc-maps", "title": "2 Sep 2026 galactic-centre peak brightness (T_B) and first-moment velocity maps (FITS)", "campaign": "2026-09-02-galactic-center", "instrument_id": "dish222", "observation_time": { "start": "2026-09-02", "end": "2026-09-02", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "file names"}] }, "coverage": { "frame": "equatorial", "lon_min_deg": 240, "lon_max_deg": 297, "lat_min_deg": -31, "lat_max_deg": -1, "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "WCS"}] }, "coordinate_system": { "value": "equatorial_equinox_unspecified", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "CTYPE"}] }, "velocity_frame": { "value": "LSR_kind_unspecified", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "velocity HISTORY"}] }, "velocity_definition": { "value": "intensity_weighted_first_moment", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "velocity HISTORY 'intensity-weighted LSR velocity'"}] }, "product_class": "derived_science_product", "data_level": "L5", "file_formats": ["zip", "fits"], "native_availability": "derived_only", "missing_source": true, "calibration_id": "C2", "calibration_assignment": { "value": "Peak T_B = T_A / 0.30 with 4-sigma detection", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "peak_TB HISTORY; TSYS, ETA_MB"}] }, "portal_status": "historical", "recommended_for_students": true, "student_notes": "Good for velocity-field and LAB-comparison exercises; brightness is on the superseded C2 scale.", "files": [ { "source_id": "src-gc-products-20260902", "artifact_id": "art-20260902-peak-tb-map", "role": "derived_map", "data_level": "L5", "format": "fits" }, { "source_id": "src-gc-products-20260902", "artifact_id": "art-20260902-velocity-map", "role": "derived_map", "data_level": "L5", "format": "fits" } ], "lineage": { "derived_from": ["ds-20260902-gc-ta-cube"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "facts": [ { "key": "peak_tb_median_k", "value": 90.3, "unit": "K", "evidence": "inferred", "sources": [{"source_id": "src-phase0-audit", "locator": "section C.2 DS-4"}], "note": "Measured in the Phase 0 audit on the C2 scale." }, { "key": "peak_tb_max_k", "value": 777, "unit": "K", "evidence": "inferred", "sources": [{"source_id": "src-phase0-audit", "locator": "section C.2 DS-4"}], "note": "Physically implausible outliers present." } ], "limitations": [ { "value": "Brightness about 1.6 times LAB; latitude profile does not fall off the plane as expected", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "products figure, checks 1 and 2"}] }, { "value": "'No detection' pixels are stored as 0, not NaN", "evidence": "inferred", "sources": [{"source_id": "src-phase0-audit", "locator": "finding S15"}], "note": "Inferred from the value distribution." }, { "value": "Stray radiation through sidelobes is a proposed but unverified explanation for the off-plane excess", "evidence": "inferred", "sources": [{"source_id": "src-private-project-records"}], "note": "Summarised from AI-assisted analysis in private project records; not independent expert evidence." } ] }, { "dataset_id": "ds-20260902-gc-figures", "title": "2 Sep 2026 galactic-centre product and velocity figures", "campaign": "2026-09-02-galactic-center", "instrument_id": "dish222", "observation_time": { "start": "2026-09-02", "end": "2026-09-02", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "figure titles"}] }, "product_class": "visualization", "data_level": "L7", "file_formats": ["png"], "native_availability": "derived_only", "missing_source": true, "calibration_id": "C2", "calibration_assignment": { "value": "Brightness panels labelled 'Kelvin, T_sys 179.5 K / eta 0.30'", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "products figure"}] }, "portal_status": "historical", "recommended_for_students": false, "files": [ { "source_id": "src-gc-products-20260902", "artifact_id": "art-20260902-products-figure", "role": "visualization", "data_level": "L7", "format": "png", "note": "Includes validation panels versus LAB." }, { "source_id": "src-gc-products-20260902", "artifact_id": "art-20260902-velocity-figure", "role": "visualization", "data_level": "L7", "format": "png" } ], "public_assets": [ { "asset_id": "pub-fig-20260902-galactic-centre", "path": "radio-astronomy/portal/assets/images/research/dish222-2026-09-02-galactic-centre-c2.png", "media_type": "image/png", "sha256": "15e488a605a4519dfcb83f28dc26b886a79d7f6463705899af1d8100ca213a68", "bytes": 376022, "rendition": "Resized to 1600 px width and re-encoded as PNG without embedded metadata.", "calibration": { "calibration_id": "C2", "epoch_status": "historical", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "products figure, brightness panel title"}] }, "caption": "2 Sep 2026 Galactic-centre area scan with two checks against the LAB survey, on the historical C2 scale (T_sys = 179.5 K, eta = 0.30). Velocities look reasonable; brightness is about 1.6 times LAB and does not fall off away from the plane. Not on the current C4 scale.", "alt": "Four panels from the 2 Sep 2026 Galactic-centre area scan: brightness map, velocity map, brightness against Galactic latitude compared with LAB, and a scatter of DISH222 against LAB brightness with a median ratio of 1.62.", "used_on": ["portal/data-to-science.html"] } ], "lineage": { "derived_from": ["ds-20260902-gc-maps"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "limitations": [{"value": "Superseded calibration epoch (C2)", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923"}]}] }, { "dataset_id": "ds-20260903-ac-ta-cube", "title": "3 Sep 2026 morning anticentre-side scans: antenna-temperature cube (FITS)", "campaign": "2026-09-03-anticenter", "instrument_id": "dish222", "observation_time": { "start": "2026-09-03", "end": "2026-09-03", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "velocity-figure title '3 Sep 2026 morning scans'"}], "note": "Time of day not recorded in headers." }, "target": { "value": "Galactic anticentre side (RA 5.3-8.4 h per figure title)", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "figure title; HISTORY 'anticenter scans 3 Sep'"}] }, "coverage": { "frame": "equatorial", "lon_min_deg": 78, "lon_max_deg": 127.5, "lat_min_deg": -16, "lat_max_deg": 35, "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "cube_TA WCS (34 x 103 at 1.5 x 0.5 deg)"}] }, "observing_mode": {"value": null, "evidence": "unknown", "note": "Scan mode not recorded."}, "coordinate_system": { "value": "equatorial_equinox_unspecified", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "CTYPE; no RADESYS/EQUINOX"}] }, "velocity_frame": { "value": "LSR_kind_unspecified", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "HISTORY '... LSR'"}] }, "spectral_line": {"name": "H I 21 cm"}, "product_class": "calibrated_product", "data_level": "L4", "additional_levels": ["L3"], "file_formats": ["zip", "fits"], "native_availability": "derived_only", "missing_source": true, "calibration_id": "C2", "calibration_assignment": { "value": "BUNIT K; TSYS = 179.5, ETA_MB = 0.3", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "cube_TA header"}] }, "processing_status": {"value": "RFI-excised, de-ramped, LSR", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "HISTORY"}]}, "portal_status": "historical", "recommended_for_students": false, "student_notes": "Artefact-dominated; not a starting point.", "files": [ { "source_id": "src-ac-products-20260903", "artifact_id": "art-20260903-ta-cube", "role": "calibrated_cube", "data_level": "L4", "format": "fits" } ], "lineage": { "derived_from": ["ds-20260903-ac-am-native-spectra"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "facts": [ { "key": "finite_fraction", "value": 0.185, "unit": "dimensionless", "evidence": "inferred", "sources": [{"source_id": "src-phase0-audit", "locator": "section C.2 DS-5"}], "note": "Measured in the Phase 0 audit." }, { "key": "cube_max_k", "value": 9850, "unit": "K", "evidence": "inferred", "sources": [{"source_id": "src-phase0-audit", "locator": "section C.2 DS-5"}], "note": "Artefacts; physically implausible." } ], "limitations": [ { "value": "Header lacks TELESCOP, DATE-OBS, RESTFRQ, SPECSYS and equinox", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "headers"}] }, {"value": "Superseded calibration epoch (C2)", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923"}]} ] }, { "dataset_id": "ds-20260903-ac-maps", "title": "3 Sep 2026 anticentre-side peak T_B and first-moment velocity maps (FITS)", "campaign": "2026-09-03-anticenter", "instrument_id": "dish222", "observation_time": { "start": "2026-09-03", "end": "2026-09-03", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "file names"}] }, "coverage": { "frame": "equatorial", "lon_min_deg": 78, "lon_max_deg": 127.5, "lat_min_deg": -16, "lat_max_deg": 35, "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "WCS"}] }, "coordinate_system": { "value": "equatorial_equinox_unspecified", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "CTYPE"}] }, "velocity_frame": { "value": "LSR_kind_unspecified", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "velocity HISTORY"}] }, "velocity_definition": { "value": "intensity_weighted_first_moment", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "velocity HISTORY 'intensity-weighted LSR velocity'"}] }, "product_class": "derived_science_product", "data_level": "L5", "file_formats": ["zip", "fits"], "native_availability": "derived_only", "missing_source": true, "calibration_id": "C2", "calibration_assignment": { "value": "Peak T_B = T_A / 0.30 with 4-sigma detection", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "peak_TB HISTORY"}] }, "portal_status": "historical", "recommended_for_students": false, "files": [ { "source_id": "src-ac-products-20260903", "artifact_id": "art-20260903-peak-tb-map", "role": "derived_map", "data_level": "L5", "format": "fits" }, { "source_id": "src-ac-products-20260903", "artifact_id": "art-20260903-velocity-map", "role": "derived_map", "data_level": "L5", "format": "fits" } ], "lineage": { "derived_from": ["ds-20260903-ac-ta-cube"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "limitations": [ { "value": "Peak T_B uses 0 for 'no detection'; only about 8% of velocity pixels are finite", "evidence": "inferred", "sources": [{"source_id": "src-phase0-audit", "locator": "section C.2 DS-5"}], "note": "Measured in the Phase 0 audit." }, {"value": "Superseded calibration epoch (C2)", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923"}]} ] }, { "dataset_id": "ds-20260903-ac-figure", "title": "3 Sep 2026 smoothed brightness and velocity figure", "campaign": "2026-09-03-anticenter", "instrument_id": "dish222", "observation_time": { "start": "2026-09-03", "end": "2026-09-03", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "figure title"}] }, "product_class": "visualization", "data_level": "L7", "file_formats": ["png"], "native_availability": "derived_only", "missing_source": true, "calibration_id": "C2", "calibration_assignment": { "value": "Brightness in K on the C2 scale", "evidence": "inferred", "sources": [{"source_id": "src-ac-products-20260903"}], "note": "Made from the C2 maps in the same archive." }, "portal_status": "historical", "recommended_for_students": false, "files": [ { "source_id": "src-ac-products-20260903", "artifact_id": "art-20260903-velocity-figure", "role": "visualization", "data_level": "L7", "format": "png" } ], "lineage": { "derived_from": ["ds-20260903-ac-maps"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "limitations": [ { "value": "Smoothed rendering of an artefact-dominated dataset", "evidence": "inferred", "sources": [{"source_id": "src-phase0-audit", "locator": "section C.2 DS-5"}], "note": "See the cube facts." } ] }, { "dataset_id": "ds-allsky-trusted-maps", "title": "All-sky 'TRUSTED' composite: peak T_B and velocity (FITS)", "campaign": "full-survey", "instrument_id": "dish222", "observation_time": { "start": "2026-08-26", "end": "2026-09-03", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "overlay figure session labels: 26 Aug, 30 Aug, 1 Sep, 2 Sep, 3 Sep am, 3 Sep pm"}] }, "coverage": { "frame": "equatorial", "lon_min_deg": 0, "lon_max_deg": 358.5, "lat_min_deg": -45, "lat_max_deg": 90, "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "WCS (240 x 271 at 1.5 x 0.5 deg)"}], "note": "Grid extent; data fill about 9.9% of pixels (RA about 3.8-8 h and 14-20.5 h)." }, "observing_mode": { "value": "multi_session_composite", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "overlay session boxes"}] }, "coordinate_system": { "value": "equatorial_equinox_unspecified", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "CTYPE; no RADESYS/EQUINOX"}] }, "velocity_frame": { "value": "LSR_kind_unspecified", "evidence": "inferred", "sources": [{"source_id": "src-allsky-products", "locator": "overlay colour bar 'V_LSR'"}], "note": "Not stated in the FITS header." }, "velocity_definition": {"value": null, "evidence": "unknown", "note": "Not stated."}, "product_class": "curated_product", "data_level": "L6", "file_formats": ["zip", "fits"], "native_availability": "partial", "missing_source": true, "calibration_id": "C2", "calibration_assignment": { "value": "Calibration not recorded in the product metadata (no calibration keywords in the headers); C2 is inferred from project chronology", "evidence": "inferred", "sources": [ {"source_id": "src-allsky-products", "locator": "headers (no TSYS/ETA_MB)"}, {"source_id": "src-gc-products-20260902", "locator": "C2 headers of contemporaneous products"} ], "note": "C2 was the scale in use when the composite was made (about 4 Sep 2026). Needs confirmation from whoever produced the composite." }, "processing_status": { "value": "TRUSTED selection: 40 <= T_B <= 160 K, |v| <= 35 km/s, dawn Sun band removed, speckles removed ('LAB-validated rule')", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "FITS HISTORY"}] }, "portal_status": "showcase", "recommended_for_students": false, "student_notes": "Showcase and LAB-comparison illustration only. Its native lineage is incomplete in the supplied archive and its selection cuts remove faint and high-velocity gas by construction.", "files": [ {"source_id": "src-allsky-products", "artifact_id": "art-allsky-peak-tb-map", "role": "curated_map", "data_level": "L6", "format": "fits"}, {"source_id": "src-allsky-products", "artifact_id": "art-allsky-velocity-map", "role": "curated_map", "data_level": "L6", "format": "fits"} ], "lineage": { "derived_from": [ "ds-20260826-og-native-spectra", "ds-20260830-session", "ds-20260901-gc-plane-scan", "ds-20260902-gc-native-spectra", "ds-20260903-ac-am-native-spectra", "ds-20260903-pm-session" ], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."}, "note": "Only the 26 Aug native spectra are supplied. In the overlap with the 2 Sep peak map the composite is about 0.81 times the 2 Sep values (median) and matches it in only 0.3% of pixels, so it was reprocessed rather than mosaicked from the supplied FITS (Phase 0 audit measurement)." }, "limitations": [ { "value": "Native lineage incomplete: three of six source sessions have no supplied data at any level and two are derived-only", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "overlay session labels"}, {"source_id": "src-phase0-audit", "locator": "section C.4"}] }, { "value": "Selection cuts (40-160 K, |v| <= 35 km/s) bias any statistics drawn from it", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "HISTORY"}] }, { "value": "The 'LAB-validated rule' is not documented beyond the HISTORY card", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "HISTORY"}] } ] }, { "dataset_id": "ds-allsky-trusted-overlay", "title": "All-sky 'TRUSTED' values overlaid on the LAB survey (figure)", "campaign": "full-survey", "instrument_id": "dish222", "observation_time": { "start": "2026-08-26", "end": "2026-09-03", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "overlay session labels"}] }, "product_class": "visualization", "data_level": "L7", "file_formats": ["png"], "native_availability": "partial", "missing_source": true, "calibration_id": "C2", "calibration_assignment": { "value": "Calibration not recorded in the product metadata (no calibration keywords in the headers); C2 is inferred from project chronology", "evidence": "inferred", "sources": [{"source_id": "src-allsky-products"}], "note": "C2 was the scale in use when the composite was made (about 4 Sep 2026). Needs confirmation from whoever produced the composite." }, "portal_status": "showcase", "recommended_for_students": false, "files": [{"source_id": "src-allsky-products", "artifact_id": "art-allsky-overlay-figure", "role": "visualization", "data_level": "L7", "format": "png"}], "public_assets": [ { "asset_id": "pub-fig-allsky-trusted-overlay", "path": "radio-astronomy/portal/assets/images/research/dish222-allsky-trusted-overlay.png", "media_type": "image/png", "sha256": "57965ebf3989a9c0d80bbc7fc639857cea0fbe4daa8ebce54901adbcdf1f7abf", "bytes": 791621, "rendition": "Resized to 1600 px width and re-encoded as PNG without embedded metadata.", "calibration": { "calibration_id": "C2", "epoch_status": "historical", "evidence": "inferred", "sources": [{"source_id": "src-allsky-products", "locator": "FITS headers (no calibration keywords)"}], "note": "The calibration is not recorded in the product metadata; C2 is inferred from project chronology (the scale in use when the composite was made, about 4 Sep 2026)." }, "caption": "All-sky TRUSTED composite values over the LAB survey, combining six sessions from 26 Aug to 3 Sep 2026. A showcase product with incomplete native lineage. Its calibration is not recorded in the product metadata; the historical C2 scale is inferred from project chronology.", "alt": "Two sky maps in right ascension and declination: DISH222 velocity and brightness values that passed the TRUSTED selection, drawn over the faded LAB survey, with boxes marking the source sessions.", "used_on": ["portal/data.html"] } ], "lineage": { "derived_from": ["ds-allsky-trusted-maps"], "produced_by": {"value": null, "evidence": "unknown", "note": "External processing; code not supplied."} }, "limitations": [{"value": "Inherits all limitations of the composite", "evidence": "documented", "sources": [{"source_id": "src-allsky-products"}]}] }, { "dataset_id": "ds-20260828-validation-dish222-vs-lab", "title": "DISH222 vs LAB comparison note (survey of 13-26 Aug 2026)", "campaign": "2026-08-survey", "instrument_id": "dish222", "observation_time": { "start": "2026-08-13", "end": "2026-08-26", "evidence": "documented", "sources": [{"source_id": "src-lab-comparison-note-20260828", "locator": "subtitle"}] }, "product_class": "validation_report", "data_level": null, "file_formats": ["docx"], "native_availability": "not_applicable", "missing_source": false, "calibration_id": "C1", "calibration_assignment": { "value": "Comparisons made in relative dB and with the LAB-anchored T_sys_eff of 330-480 K", "evidence": "documented", "sources": [{"source_id": "src-lab-comparison-note-20260828", "locator": "sections 1 and 2.4"}] }, "portal_status": "historical", "recommended_for_students": true, "student_notes": "Historical state of knowledge on 28 Aug. Its correlation figures (r = 0.82, 0.81, 0.96) predate the Kelvin calibrations and their computation is not supplied.", "files": [{"source_id": "src-lab-comparison-note-20260828", "role": "validation_report", "data_level": null, "format": "docx"}], "lineage": { "derived_from": ["ds-20260813-20260825-survey-sessions", "ds-20260826-og-native-spectra"], "produced_by": {"value": null, "evidence": "unknown", "note": "Author and analysis code not recorded."} }, "facts": [ { "key": "brightness_correlation_outer_arm", "value": 0.82, "unit": "dimensionless", "evidence": "documented", "sources": [{"source_id": "src-lab-comparison-note-20260828", "locator": "table"}] }, { "key": "brightness_correlation_l190_cut", "value": 0.81, "unit": "dimensionless", "evidence": "documented", "sources": [{"source_id": "src-lab-comparison-note-20260828", "locator": "table"}] }, { "key": "velocity_longitude_correlation_26aug", "value": 0.96, "unit": "dimensionless", "evidence": "documented", "sources": [{"source_id": "src-lab-comparison-note-20260828", "locator": "table"}] } ], "limitations": [ { "value": "Computation inputs and code not supplied; claims cannot be reproduced yet", "evidence": "documented", "sources": [{"source_id": "src-phase0-audit", "locator": "section C.2 DS-8"}] } ] }, { "dataset_id": "ds-20260923-cal-report", "title": "Absolute brightness-temperature calibration report, 20-23 Sep 2026 (defines C3 and C4)", "campaign": "2026-09-20-calibration", "instrument_id": "dish222", "observation_time": { "start": "2026-09-20", "end": "2026-09-23", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923", "locator": "title block 'Measurements 20 - 23 September 2026'"}] }, "observing_mode": {"value": "sky_reference_calibration", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923", "locator": "section 4"}]}, "product_class": "calibration_report", "data_level": null, "file_formats": ["pdf"], "native_availability": "not_applicable", "missing_source": false, "calibration_id": "C4", "calibration_assignment": { "value": "Defines C4 (and documents C3)", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923", "locator": "sections 1, 3, 6"}] }, "portal_status": "current", "recommended_for_students": true, "student_notes": "Table 1 (eight points) is the smallest self-contained calibration dataset; the published fit is exactly reproducible (see calibration-epochs.json C4).", "files": [{"source_id": "src-cal-report-20260923", "role": "calibration_report", "data_level": null, "format": "pdf"}], "lineage": { "derived_from": ["ds-20260920-20260923-calibration-measurements", "ds-20260922-gc-survey"], "produced_by": {"value": null, "evidence": "unknown", "note": "Author metadata 'DISH222 / 7Z1EC'; analysis code not supplied."} }, "limitations": [ { "value": "The underlying measurements (15-sample medians, hot-load powers, solar transit) are not supplied as data files", "evidence": "documented", "sources": [{"source_id": "src-phase0-audit", "locator": "section L"}] } ] }, { "dataset_id": "ds-20260813-20260825-survey-sessions", "title": "DISH222 survey sessions 13-25 Aug 2026 (not supplied)", "campaign": "2026-08-survey", "instrument_id": "dish222", "observation_time": { "start": "2026-08-13", "end": "2026-08-25", "evidence": "documented", "sources": [{"source_id": "src-lab-comparison-note-20260828", "locator": "subtitle (13-26 August 2026)"}], "note": "26 Aug is registered separately." }, "product_class": "native_spectra", "data_level": "L0", "native_availability": "not_supplied", "missing_source": true, "calibration_id": null, "calibration_assignment": {"value": null, "evidence": "unknown"}, "portal_status": "unavailable", "recommended_for_students": false, "files": [], "lineage": {"derived_from": [], "produced_by": {"value": null, "evidence": "unknown"}}, "provenance_notes": [ { "value": "Sessions on 20 and 22 Aug are referenced in legacy code comments about bandpass and stitching fixes", "evidence": "documented", "sources": [{"source_id": "src-legacy-dish222-v75", "locator": "lines 13499, 13608-13618"}] }, { "value": "Sessions on 24-25 Aug carried 5-10 deg pointing errors before the Sun-shadow calibration", "evidence": "documented", "sources": [{"source_id": "src-lab-comparison-note-20260828", "locator": "section 2.5"}] }, { "value": "Private project records indicate that session data from 13 Aug 2026 (morning and evening) existed but were not supplied", "evidence": "inferred", "sources": [{"source_id": "src-private-project-records"}], "note": "Neutral summary of private project records." } ], "limitations": [{"value": "No data supplied", "evidence": "documented", "sources": [{"source_id": "src-phase0-audit", "locator": "section L.1"}]}] }, { "dataset_id": "ds-20260830-session", "title": "DISH222 session 30 Aug 2026 (not supplied)", "campaign": "full-survey", "instrument_id": "dish222", "observation_time": { "start": "2026-08-30", "end": "2026-08-30", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "overlay label '30 Aug'"}] }, "product_class": "native_spectra", "data_level": "L0", "native_availability": "not_supplied", "missing_source": true, "calibration_id": null, "calibration_assignment": {"value": null, "evidence": "unknown"}, "portal_status": "unavailable", "recommended_for_students": false, "files": [], "lineage": {"derived_from": [], "produced_by": {"value": null, "evidence": "unknown"}}, "limitations": [ { "value": "Known only as a source of the all-sky composite", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "overlay"}] } ] }, { "dataset_id": "ds-20260901-gc-plane-scan", "title": "DISH222 galactic-plane scan 1 Sep 2026 (native data and FITS not supplied)", "campaign": "2026-09-01-galactic-plane", "instrument_id": "dish222", "observation_time": { "start": "2026-09-01", "end": "2026-09-01", "evidence": "documented", "sources": [ {"source_id": "src-kelvin-map-figure-20260901", "locator": "title"}, {"source_id": "src-allsky-products", "locator": "overlay label '1 Sep'"} ] }, "product_class": "native_spectra", "data_level": "L0", "native_availability": "not_supplied", "missing_source": true, "calibration_id": null, "calibration_assignment": {"value": null, "evidence": "unknown", "note": "Its products were expressed on C2 (see the kelvin-map figure)."}, "portal_status": "unavailable", "recommended_for_students": false, "files": [], "lineage": {"derived_from": [], "produced_by": {"value": null, "evidence": "unknown"}}, "provenance_notes": [ { "value": "The eta = 0.30 of C2 was derived from this scan's comparison with LAB", "evidence": "documented", "sources": [ {"source_id": "src-kelvin-map-figure-20260901", "locator": "LAB comparison panels"}, {"source_id": "src-legacy-dish222-v75", "locator": "V72 comment, lines 17109-17117"} ] }, { "value": "Private project records indicate FITS products of this scan existed but were not supplied", "evidence": "inferred", "sources": [{"source_id": "src-private-project-records"}], "note": "Neutral summary of private project records." } ], "limitations": [{"value": "No data supplied", "evidence": "documented", "sources": [{"source_id": "src-phase0-audit", "locator": "section L.1"}]}] }, { "dataset_id": "ds-20260901-gc-stray-corrected-products", "title": "1 Sep 2026 first-order stray-radiation-corrected products (not supplied)", "campaign": "2026-09-01-galactic-plane", "instrument_id": "dish222", "observation_time": { "start": "2026-09-01", "end": "2026-09-01", "evidence": "inferred", "sources": [{"source_id": "src-private-project-records"}], "note": "Neutral summary of private project records." }, "product_class": "curated_product", "data_level": "L6", "native_availability": "not_supplied", "missing_source": true, "calibration_id": null, "calibration_assignment": {"value": null, "evidence": "unknown", "note": "Presumably C2, but not supplied."}, "portal_status": "unavailable", "recommended_for_students": false, "files": [], "lineage": {"derived_from": ["ds-20260901-gc-plane-scan"], "produced_by": {"value": null, "evidence": "unknown"}}, "provenance_notes": [ { "value": "Private project records indicate an experimental first-order stray-radiation correction (plane-template subtraction) was applied to the 1 Sep cube by AI-assisted analysis. The method is unverified and the products were not supplied.", "evidence": "inferred", "sources": [{"source_id": "src-private-project-records"}], "note": "Not independent expert evidence." } ], "limitations": [ { "value": "No data supplied; method unverified", "evidence": "inferred", "sources": [{"source_id": "src-private-project-records"}], "note": "See provenance note." } ] }, { "dataset_id": "ds-20260902-gc-native-spectra", "title": "2 Sep 2026 galactic-centre area scan: native spectra and manifest (not supplied)", "campaign": "2026-09-02-galactic-center", "instrument_id": "dish222", "observation_time": { "start": "2026-09-02", "end": "2026-09-02", "evidence": "documented", "sources": [{"source_id": "src-gc-products-20260902", "locator": "file names"}] }, "product_class": "native_spectra", "data_level": "L0", "native_availability": "not_supplied", "missing_source": true, "calibration_id": null, "calibration_assignment": {"value": null, "evidence": "unknown"}, "portal_status": "unavailable", "recommended_for_students": false, "files": [], "lineage": {"derived_from": [], "produced_by": {"value": null, "evidence": "unknown"}}, "limitations": [ { "value": "Needed to re-reduce the 2 Sep products", "evidence": "documented", "sources": [{"source_id": "src-phase0-audit", "locator": "section L.1"}] } ] }, { "dataset_id": "ds-20260903-ac-am-native-spectra", "title": "3 Sep 2026 morning anticentre-side scans: native spectra (not supplied)", "campaign": "2026-09-03-anticenter", "instrument_id": "dish222", "observation_time": { "start": "2026-09-03", "end": "2026-09-03", "evidence": "documented", "sources": [{"source_id": "src-ac-products-20260903", "locator": "figure title '3 Sep 2026 morning scans'"}] }, "product_class": "native_spectra", "data_level": "L0", "native_availability": "not_supplied", "missing_source": true, "calibration_id": null, "calibration_assignment": {"value": null, "evidence": "unknown"}, "portal_status": "unavailable", "recommended_for_students": false, "files": [], "lineage": {"derived_from": [], "produced_by": {"value": null, "evidence": "unknown"}}, "limitations": [ { "value": "Needed to re-reduce the 3 Sep products", "evidence": "documented", "sources": [{"source_id": "src-phase0-audit", "locator": "section L.1"}] } ] }, { "dataset_id": "ds-20260903-pm-session", "title": "3 Sep 2026 afternoon/evening session (not supplied)", "campaign": "full-survey", "instrument_id": "dish222", "observation_time": { "start": "2026-09-03", "end": "2026-09-03", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "overlay label '3 Sep pm'"}] }, "product_class": "native_spectra", "data_level": "L0", "native_availability": "not_supplied", "missing_source": true, "calibration_id": null, "calibration_assignment": {"value": null, "evidence": "unknown"}, "portal_status": "unavailable", "recommended_for_students": false, "files": [], "lineage": {"derived_from": [], "produced_by": {"value": null, "evidence": "unknown"}}, "limitations": [ { "value": "Known only as a source of the all-sky composite", "evidence": "documented", "sources": [{"source_id": "src-allsky-products", "locator": "overlay"}] } ] }, { "dataset_id": "ds-20260908-cygnus-session", "title": "8 Sep 2026 Cygnus-region session (not supplied)", "campaign": "2026-09-cygnus", "instrument_id": "dish222", "observation_time": { "start": "2026-09-08", "end": "2026-09-08", "evidence": "inferred", "sources": [{"source_id": "src-private-project-records"}], "note": "Neutral summary of private project records." }, "product_class": "native_spectra", "data_level": "L0", "native_availability": "not_supplied", "missing_source": true, "calibration_id": null, "calibration_assignment": {"value": null, "evidence": "unknown", "note": "Private records indicate products on the C2 scale (T_sys 180 K, eta 0.3)."}, "portal_status": "unavailable", "recommended_for_students": false, "files": [], "lineage": {"derived_from": [], "produced_by": {"value": null, "evidence": "unknown"}}, "limitations": [ { "value": "No data supplied; existence known only from private records", "evidence": "inferred", "sources": [{"source_id": "src-private-project-records"}], "note": "Neutral summary." } ] }, { "dataset_id": "ds-20260913-area-scan", "title": "13 Sep 2026 area scan, RA about 19.4-23.1 h, Dec about 32-66 deg (not supplied)", "campaign": "2026-09-cygnus", "instrument_id": "dish222", "observation_time": { "start": "2026-09-13", "end": "2026-09-13", "evidence": "inferred", "sources": [{"source_id": "src-private-project-records"}], "note": "Neutral summary of private project records." }, "product_class": "native_spectra", "data_level": "L0", "native_availability": "not_supplied", "missing_source": true, "calibration_id": null, "calibration_assignment": {"value": null, "evidence": "unknown", "note": "Private records indicate products on the C2 scale."}, "portal_status": "unavailable", "recommended_for_students": false, "files": [], "lineage": {"derived_from": [], "produced_by": {"value": null, "evidence": "unknown"}}, "limitations": [ { "value": "No data supplied; existence known only from private records", "evidence": "inferred", "sources": [{"source_id": "src-private-project-records"}], "note": "Neutral summary." } ] }, { "dataset_id": "ds-20260920-20260923-calibration-measurements", "title": "20-23 Sep 2026 calibration measurements: hot loads, solar transit, eight sky-reference positions (not supplied)", "campaign": "2026-09-20-calibration", "instrument_id": "dish222", "observation_time": { "start": "2026-09-20", "end": "2026-09-23", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923", "locator": "title block and sections 3-4"}] }, "product_class": "calibration_record", "data_level": null, "native_availability": "not_supplied", "missing_source": true, "calibration_id": null, "calibration_assignment": {"value": null, "evidence": "unknown", "note": "These measurements define C3 and C4."}, "portal_status": "unavailable", "recommended_for_students": false, "files": [], "lineage": {"derived_from": [], "produced_by": {"value": null, "evidence": "unknown"}}, "limitations": [ { "value": "Only the summary values in the report are available", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923", "locator": "Table 1"}] } ] }, { "dataset_id": "ds-20260922-gc-survey", "title": "22 Sep 2026 galactic-centre survey, 392 spectra (not supplied)", "campaign": "2026-09-20-calibration", "instrument_id": "dish222", "observation_time": { "start": "2026-09-22", "end": "2026-09-22", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923", "locator": "section 5"}] }, "product_class": "native_spectra", "data_level": "L0", "native_availability": "not_supplied", "missing_source": true, "calibration_id": null, "calibration_assignment": {"value": null, "evidence": "unknown"}, "portal_status": "unavailable", "recommended_for_students": false, "files": [], "lineage": {"derived_from": [], "produced_by": {"value": null, "evidence": "unknown"}}, "facts": [ { "key": "spectra", "value": 392, "unit": "count", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923", "locator": "section 5"}] } ], "limitations": [ { "value": "Used for the archival check of C4 (HI4PI surrogate); data not supplied", "evidence": "documented", "sources": [{"source_id": "src-cal-report-20260923", "locator": "section 5"}] } ] } ] }