{
  "retrieved": "2026-09-14",
  "gaia": {
    "url": "https://gea.esac.esa.int/tap-server/tap/sync",
    "release": "Gaia DR3",
    "query": "TOP 20000 gaia_source: parallax>10, parallax_over_error>20, phot_g_mean_mag>10, teff_gspphot IS NOT NULL; ORDER BY phot_g_mean_mag ASC. Join astrophysical_parameters by source_id for radius_gspphot, mass_flame, lum_flame.",
    "downloaded": 20000,
    "added": 19231,
    "positionalMatches": 769,
    "citation": "ESA Gaia / DPAC; Gaia Collaboration (2023), A&A 674, A1.",
    "crossmatch": "Approximate 5 arcsec + 20% distance match to HYG, not an official crossmatch. Other aliases may remain."
  },
  "exoplanets": {
    "url": "https://exoplanetarchive.ipac.caltech.edu/docs/API_PS_columns.html",
    "table": "pscomppars",
    "downloaded": 6366,
    "withPositions": 6338,
    "massNote": "pl_bmassprov distinguishes Mass, Msini and M-R relationship; composite values may come from different studies."
  },
  "asteroids": {
    "url": "https://ssd-api.jpl.nasa.gov/doc/sbdb_query.html",
    "query": "sb-kind=a, diameter>0, sort=-diameter, limit=20000; full_name,a,e,i,om,w,ma,diameter,GM,spec_B,spec_T,albedo",
    "addedCatalogSize": 19995,
    "positionNote": "Existing positions retained where names match; new orbital phases use catalog elements at their epochs and are illustrative, not current ephemerides.",
    "massNote": "GM converted from km^3/s^2 to kg; absent GM, scenario density estimates are explicitly labeled."
  },
  "featuredAsteroids": {
    "url": "https://ssd-api.jpl.nasa.gov/doc/sbdb.html",
    "ids": [
      "101955",
      "162173",
      "25143"
    ],
    "fields": "phys_par: GM, density, spec_B/spec_T",
    "note": "Bennu, Ryugu and Itokawa physical parameters; GM-based masses."
  },
  "deepSky": {
    "retrieved": "2026-09-14",
    "count": 40,
    "galaxies": 17,
    "nebulae": 11,
    "clusters": 12,
    "coordinates": "https://github.com/mattiaverga/OpenNGC",
    "files": [
      "database_files/NGC.csv",
      "database_files/addendum.csv"
    ],
    "license": "CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/",
    "distances": "https://science.nasa.gov/mission/hubble/science/explore-the-night-sky/hubble-messier-catalog/",
    "conversion": "J2000 RA/Dec to galactic Cartesian light years; extentLy = distanceLy * tan(major angular diameter in radians / 2). NASA distances are rounded estimates.",
    "data": "deep-sky.json",
    "images": "deep-sky-images/manifest.json",
    "model": "Procedural internal structure and colors; no resolved member-star catalog; orientation is illustrative."
  },
  "refresh20260915": {
    "retrieved": "2026-09-15",
    "gaia": {
      "downloaded": 120000,
      "additional": 102646,
      "totalGaia": 121877,
      "query": "TOP 120000 source_id,ra,dec,parallax,teff_gspphot,phot_g_mean_mag FROM gaiadr3.gaia_source WHERE parallax>5 AND parallax_over_error>20 AND phot_g_mean_mag>10 AND teff_gspphot IS NOT NULL ORDER BY phot_g_mean_mag ASC",
      "note": "5 arcsec + 20% distance approximate HYG deduplication; unknown mass/radius kept null. Representative nearby subset, not full Gaia."
    },
    "planets": {
      "total": 6366,
      "withDistance": 6338,
      "extraFields": [
        "eccentricity",
        "discovery year",
        "discovery method",
        "insolation",
        "stellar age",
        "planet count"
      ]
    },
    "pulsars": {
      "version": "2.8.1",
      "records": 4393,
      "url": "https://www.atnf.csiro.au/research/pulsar/psrcat/",
      "citation": "Manchester et al. (2005), AJ 129, 1993",
      "distance": "Independent estimate, inverse positive parallax, or dispersion measure model; missing distances remain unplaced."
    },
    "blackholes": {
      "total": 73,
      "located": 37,
      "dynamicallyConfirmed": 20,
      "massKnown": 15,
      "url": "https://www.astro.puc.cl/BlackCAT/",
      "catalogUpdated": "2025-09-22",
      "citation": "Corral-Santana et al. (2016), A&A 587, A61",
      "note": "Candidates marked; ranges use midpoint only for illustrative models, original text retained. Accretion views illustrate an outburst, not present activity."
    }
  }
}