{"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":"2026-09-06T15:32:15.867Z","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-12347","name":"UGC 12347","class":"irregular_galaxy_irr","category":"galaxy","object_type":"Irregular galaxy Irr","mag":15,"mag_band":"B","abs_mag":-17.013825225695868,"abs_mag_band":"B","distance_ly":82450049.43032327,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":346.301,"dec_deg":18.86796,"epoch_ra_deg":346.632438,"epoch_dec_deg":19.012832,"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-12347","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15,"redshift":0.00542472271236,"hubble_type":"Irr","redshift_cmb":0.0058762790394275,"uncertainties":{"distance_ly":[15890873.249708012,15914857.232886277],"stellar_mass_solar":[56053543.97885461,56053543.97885461]},"major_axis_arcmin":0.68309,"minor_axis_arcmin":0.582607,"morphology_source":"SIMBAD (2003A&A...412...45P, quality E)","position_angle_deg":63,"stellar_mass_solar":93422573.29809101},"designations":[{"catalog":"PGC","designation":"PGC 70426"},{"catalog":"WISExSCOS","designation":"WISExSCOS J230512.07+185203.4"}],"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":"2026-09-02T19:50:56.720Z","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."}