{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T20:46:15.719Z","years_from_j2000":26.681,"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":"ugc-9878","name":"UGC 9878","class":"spiral_galaxy_sbc","category":"galaxy","object_type":"Spiral galaxy Sbc","mag":14.225,"mag_band":"B","abs_mag":-20.746018064345918,"abs_mag_band":"B","distance_ly":321832195.5903434,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":231.13588,"dec_deg":83.077019,"epoch_ra_deg":230.543484,"epoch_dec_deg":82.980786,"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":"Ursa Minor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ugc-9878","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.225,"h_mag":10.951,"j_mag":11.733,"k_mag":10.595,"redshift":0.02189,"hubble_type":"Sbc","redshift_cmb":0.0226514398832516,"uncertainties":{"distance_ly":[17806168.25384911,17810483.7194328],"stellar_mass_solar":[18682543018.38955,18682543018.38955]},"major_axis_arcmin":1.03956,"minor_axis_arcmin":0.406989,"morphology_source":"SIMBAD (2003A&A...412...45P, quality E)","position_angle_deg":86,"stellar_mass_solar":37365086036.7791},"designations":[{"catalog":"2MASX","designation":"2MASX 15243261+8304372"},{"catalog":"PGC","designation":"PGC 55015"},{"catalog":"WISExSCOS","designation":"WISExSCOS J152432.79+830437"}],"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":"2026-09-02T19:50:56.720Z","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."}