# ASTR 430 Reference Log

## Exact anchors and verification

- NASA ADS API Help: https://ui.adsabs.harvard.edu/help/api/ . Official URL; content extraction was unavailable this session, so human spot-check is required.
- Gaia EDR3 Documentation, Chapters 4, 8, 9, 12, and 13: https://gea.esac.esa.int/archive/documentation/GEDR3/ . The landing page was fetched; archive access, data model, cross-match, validation, and credit instructions were inspected.
- MAST Missions and Data: https://archive.stsci.edu/missions-and-data/ . Fetched this session; active/legacy mission products, data collections, policies, and credits were inspected.
- SDSS SkyServer DR18: https://skyserver.sdss.org/dr18/en/ . Official URL; content extraction was unavailable, so human spot-check is required.
- NASA Exoplanet Archive documentation: https://exoplanetarchive.ipac.caltech.edu/docs/ . Official URL; HTTP 403 occurred, so archive-specific details require human spot-check.
- SIMBAD: https://simbad.cds.unistra.fr/simbad/ and User Guide: http://simbad.cds.unistra.fr/guide/simbad.htx . Fetched this session; identifiers, bibliography, coordinate/TAP queries, ODbL status, and acknowledgment guidance were inspected.
- Astropy stable documentation: https://docs.astropy.org/en/stable/ . Fetched this session; user guide, installation, project, and citation links were inspected.
- NASA Open Science Overview: https://science.nasa.gov/open-science-overview/ . Official policy anchor; human spot-check required.
- AAS Code of Ethics: https://aas.org/about/governance/ethics . Official ethics anchor; human spot-check required.

## Provenance levels

- **Level 1, live-verified this session:** official documentation facts explicitly identified above where fetch content was available; incomplete extraction is disclosed per source.
- **Level 2, standard published or policy value not fully re-verified:** common archive conventions, statistical guidance, software behavior, and ethics interpretations named in artifacts; human spot-check is required.
- **Level 3, synthetic/instructor-provided:** compact CSVs, worked-example inputs, SVGs, rubric scores, and query manifests generated by `src/generate_astr430_package.py`; they are not archive results or new observations.

No external image is embedded. All lecture figures are original, lecture-specific SVG reasoning diagrams. Students must cite the official service even when using a supplied level-3 teaching record.