{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T09:18:33.544Z","years_from_j2000":26.666,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"pgc-100730","name":"PGC 100730","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":17.66,"mag_band":"B","abs_mag":-14.843308908168144,"abs_mag_band":"B","distance_ly":103296987.66133535,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":154.465,"dec_deg":-33.40037,"epoch_ra_deg":154.765241,"epoch_dec_deg":-33.534407,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Antlia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-100730","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":17.66,"redshift":0.00829605414803,"redshift_cmb":0.0073538376109943,"uncertainties":{"distance_ly":[24227569.17026324,24283844.325360898],"stellar_mass_solar":[28026511.474615317,28026511.474615317]},"stellar_mass_solar":46710852.45769219},"designations":[{"catalog":"PGC","designation":"PGC 100730"},{"catalog":"WISExSCOS","designation":"WISExSCOS J101751.58-332402.7"}],"source":{"id":"glade_plus","name":"GLADE+ (Galaxy List for the Advanced Detector Era)","url":"https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/291","license":"VizieR terms; cite Dalya+ 2022 (2022MNRAS.514.1403D)"},"updated_at":"2026-08-30T09:56:50.739Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}