{"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":"2026-08-31T21:57:16.474Z","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-41831","name":"PGC 41831","class":"elliptical_galaxy_den","category":"galaxy","object_type":"Elliptical galaxy dEn","mag":15.769,"mag_band":"B","abs_mag":-17.958091202439945,"abs_mag_band":"B","distance_ly":181486412.41969797,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":188.634018,"dec_deg":16.032558,"epoch_ra_deg":188.972106,"epoch_dec_deg":15.884506,"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":"Coma Berenices","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-41831","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.769,"h_mag":13.872,"j_mag":14.447,"k_mag":13.567,"redshift":0.012273,"hubble_type":"dEn","redshift_cmb":0.0128667814920444,"uncertainties":{"distance_ly":[35804961.39713855,35928430.665414095],"stellar_mass_solar":[373673855.4009336,373673855.4009336]},"major_axis_arcmin":0.553697,"minor_axis_arcmin":0.405361,"morphology_source":"SIMBAD (2015ApJS..217...27A, quality C)","position_angle_deg":175,"stellar_mass_solar":653929246.9516339},"designations":[{"catalog":"2MASX","designation":"2MASX 12343216+1601572"},{"catalog":"PGC","designation":"PGC 41831"},{"catalog":"WISExSCOS","designation":"WISExSCOS J123432.18+160157.4"}],"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."}