{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T13:22:34.185Z","years_from_j2000":26.667,"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-31949","name":"PGC 31949","class":"spiral_galaxy_sb","category":"galaxy","object_type":"Spiral galaxy Sb","mag":14.554,"mag_band":"B","abs_mag":-21.30290163092078,"abs_mag_band":"B","distance_ly":483956359.77910775,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":160.792191,"dec_deg":39.038734,"epoch_ra_deg":161.177337,"epoch_dec_deg":38.898182,"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":"Leo Minor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-31949","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.554,"h_mag":11.75,"j_mag":12.452,"k_mag":11.515,"redshift":0.03389,"hubble_type":"Sb","redshift_cmb":0.033785683673905,"uncertainties":{"distance_ly":[25107545.16788871,25118937.11624151],"stellar_mass_solar":[9340618262.700281,9340618262.700281]},"major_axis_arcmin":0.66972,"minor_axis_arcmin":0.592233,"morphology_source":"SIMBAD (2013AJ....146..151O, quality D)","position_angle_deg":152,"stellar_mass_solar":28021854788.100845},"designations":[{"catalog":"2MASX","designation":"2MASX 10431012+3902194"},{"catalog":"PGC","designation":"PGC 31949"},{"catalog":"WISExSCOS","designation":"WISExSCOS J104310.11+390219.2"}],"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":"2026-08-30T09:56:50.739Z","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."}