{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T23:08:46.177Z","years_from_j2000":26.665,"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-31599","name":"PGC 31599","class":"lenticular_galaxy_sb0_r","category":"galaxy","object_type":"Lenticular galaxy SB0:r","mag":15.426,"mag_band":"B","abs_mag":-19.254486013831944,"abs_mag_band":"B","distance_ly":281528961.2839088,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":159.505051,"dec_deg":-27.451296,"epoch_ra_deg":159.820827,"epoch_dec_deg":-27.59063,"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-31599","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.426,"h_mag":12.023,"j_mag":12.71,"k_mag":11.772,"redshift":0.01745,"hubble_type":"SB0:r","redshift_cmb":0.0198558016765068,"uncertainties":{"distance_ly":[13999184.187164892,14001962.433272175],"stellar_mass_solar":[1868287143.1258762,1868287143.1258762]},"major_axis_arcmin":0.353,"minor_axis_arcmin":0.233,"morphology_source":"SIMBAD (quality D)","position_angle_deg":105,"stellar_mass_solar":15880440716.569948},"designations":[{"catalog":"2MASX","designation":"2MASX 10380121-2727046"},{"catalog":"PGC","designation":"PGC 31599"},{"catalog":"WISExSCOS","designation":"WISExSCOS J103801.21-272704.1"}],"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."}