{"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":"2026-09-02T12:12:01.255Z","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-4012887","name":"PGC 4012887","class":"lenticular_galaxy_s0","category":"galaxy","object_type":"Lenticular galaxy S0","mag":17.39,"mag_band":"B","abs_mag":-17.20063130849295,"abs_mag_band":"B","distance_ly":270117136.3581376,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":232.197,"dec_deg":44.27974,"epoch_ra_deg":232.427222,"epoch_dec_deg":44.186534,"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":"Boötes","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-4012887","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":17.39,"redshift":0.0188172694086,"hubble_type":"S0","redshift_cmb":0.019062159658094,"uncertainties":{"distance_ly":[55255749.25737517,55544465.32308794],"stellar_mass_solar":[186829645.92388943,186829645.92388943]},"major_axis_arcmin":0.45445,"minor_axis_arcmin":0.152513,"morphology_source":"SIMBAD (2018MNRAS.477.4711G, quality E)","position_angle_deg":88,"stellar_mass_solar":373659291.84777886},"designations":[{"catalog":"PGC","designation":"PGC 4012887"},{"catalog":"SDSSJ","designation":"SDSSJ 152847.26+441647.3"},{"catalog":"WISExSCOS","designation":"WISExSCOS J152847.30+441647.3"}],"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."}