{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.690","julian_year":2026.69,"time":"2026-09-09T21:01:58.163Z","years_from_j2000":26.69,"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-3911254","name":"PGC 3911254","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":15.94,"mag_band":"B","abs_mag":-19.0643090735963,"abs_mag_band":"B","distance_ly":326804245.5979342,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":295.719,"dec_deg":-30.38984,"epoch_ra_deg":296.142734,"epoch_dec_deg":-30.326514,"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":"Sagittarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-3911254","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.94,"h_mag":12.807,"j_mag":13.518,"k_mag":12.626,"redshift":0.0222850011425,"redshift_cmb":0.0229955466876813,"uncertainties":{"distance_ly":[65732045.359792866,66135489.62282379],"stellar_mass_solar":[3736500535.930522,3736500535.930522]},"stellar_mass_solar":6538875937.878414},"designations":[{"catalog":"2MASX","designation":"2MASX 19425261-3023236"},{"catalog":"Other","designation":"2MASXJ19425261-3023236"},{"catalog":"PGC","designation":"PGC 3911254"},{"catalog":"WISExSCOS","designation":"WISExSCOS J194252.63-302323.2"}],"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":"2026-09-09T11:17:28.634Z","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."}