{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T07:08:44.946Z","years_from_j2000":26.669,"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-3798696","name":"PGC 3798696","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":16.801243,"mag_band":"B","abs_mag":-17.418552382784448,"abs_mag_band":"B","distance_ly":227711493.5192679,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":194.016,"dec_deg":-29.71462,"epoch_ra_deg":194.379709,"epoch_dec_deg":-29.860091,"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":"Hydra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-3798696","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.801243,"h_mag":14.072,"j_mag":14.954,"k_mag":13.99,"redshift":0.0152993476497,"redshift_cmb":0.0161049743617198,"uncertainties":{"distance_ly":[44757887.99954649,44949361.03505294],"stellar_mass_solar":[653915917.5820748,653915917.5820748]},"stellar_mass_solar":1027582156.2004031},"designations":[{"catalog":"2MASX","designation":"2MASX 12560390-2942525"},{"catalog":"Other","designation":"2MASXJ12560390-2942525"},{"catalog":"PGC","designation":"PGC 3798696"},{"catalog":"WISExSCOS","designation":"WISExSCOS J125603.87-294252.5"}],"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":"2026-09-01T22:58:55.274Z","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."}