{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-06T22:28:13.294Z","years_from_j2000":26.682,"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-12830","name":"UGC 12830","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy Sab","mag":15.394,"mag_band":"B","abs_mag":-19.207703187771678,"abs_mag_band":"B","distance_ly":271497923.7776444,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":358.457703,"dec_deg":10.944665,"epoch_ra_deg":358.800788,"epoch_dec_deg":11.094135,"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":"Pegasus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ugc-12830","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.394,"h_mag":11.414,"j_mag":12.338,"k_mag":11.048,"redshift":0.01759,"hubble_type":"Sab","redshift_cmb":0.0191582359695119,"uncertainties":{"distance_ly":[13836758.307122963,13839636.700522866],"stellar_mass_solar":[8407329010.062722,8407329010.062722]},"major_axis_arcmin":0.958793,"minor_axis_arcmin":0.256477,"morphology_source":"SIMBAD (2003A&A...412...45P, quality E)","position_angle_deg":42,"stellar_mass_solar":18682953355.69494},"designations":[{"catalog":"2MASX","designation":"2MASX 23534984+1056407"},{"catalog":"PGC","designation":"PGC 72759"},{"catalog":"WISExSCOS","designation":"WISExSCOS J235349.87+105640.9"}],"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."}