{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T04:56:56.144Z","years_from_j2000":26.666,"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-42884","name":"PGC 42884","class":"elliptical_galaxy_e_e_s0","category":"galaxy","object_type":"Elliptical galaxy E-E/S0","mag":15.643,"mag_band":"B","abs_mag":-14.435788024155606,"abs_mag_band":"B","distance_ly":33820769.147334665,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":191.049927,"dec_deg":12.941845,"epoch_ra_deg":191.387782,"epoch_dec_deg":12.794791,"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":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-42884","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.643,"h_mag":13.399,"j_mag":14.042,"k_mag":13.226,"redshift":0.00314,"hubble_type":"E-E/S0","redshift_cmb":0.0024167682537776,"uncertainties":{"distance_ly":[5181425.2210994605,5181468.68358237],"stellar_mass_solar":[6539723.177319081,6539723.177319081]},"major_axis_arcmin":0.581663,"minor_axis_arcmin":0.554092,"morphology_source":"SIMBAD (2014A&A...569A.124V, quality C)","position_angle_deg":8,"stellar_mass_solar":52317785.418552645},"designations":[{"catalog":"2MASX","designation":"2MASX 12441198+1256306"},{"catalog":"PGC","designation":"PGC 42884"},{"catalog":"WISExSCOS","designation":"WISExSCOS J124412.02+125630.5"}],"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":"2026-08-30T09:56:50.739Z","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."}