{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T23:15:25.987Z","years_from_j2000":26.679,"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-3818547","name":"PGC 3818547","class":"lenticular_galaxy_sb0","category":"galaxy","object_type":"Lenticular galaxy SB0","mag":15.93,"mag_band":"B","abs_mag":-18.85319665190964,"abs_mag_band":"B","distance_ly":295165235.8680553,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":210.82,"dec_deg":-25.47407,"epoch_ra_deg":211.200053,"epoch_dec_deg":-25.603422,"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-3818547","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.93,"h_mag":12.41,"j_mag":13.062,"k_mag":12.032,"redshift":0.0213005206503,"hubble_type":"SB0","redshift_cmb":0.0208029483368357,"uncertainties":{"distance_ly":[63144692.576830626,63511239.694867045],"stellar_mass_solar":[4670690048.125326,4670690048.125326]},"major_axis_arcmin":0.347,"minor_axis_arcmin":0.291,"morphology_source":"SIMBAD (quality D)","position_angle_deg":100,"stellar_mass_solar":12143794125.125849},"designations":[{"catalog":"2MASX","designation":"2MASX 14031673-2528263"},{"catalog":"Other","designation":"2MASXJ14031673-2528263"},{"catalog":"PGC","designation":"PGC 3818547"},{"catalog":"WISExSCOS","designation":"WISExSCOS J140316.73-252826.2"}],"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":"2026-09-02T19:50:56.720Z","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."}