{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T15:07:30.533Z","years_from_j2000":26.67,"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-38634","name":"PGC 38634","class":"spiral_galaxy_sa_e","category":"galaxy","object_type":"Spiral galaxy Sa/E","mag":14.304,"mag_band":"B","abs_mag":-20.662009949035557,"abs_mag_band":"B","distance_ly":321090802.0854776,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":182.387161,"dec_deg":17.014179,"epoch_ra_deg":182.729845,"epoch_dec_deg":16.86475,"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-38634","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.304,"h_mag":11.045,"j_mag":11.767,"k_mag":10.811,"redshift":0.02236,"hubble_type":"Sa/E","redshift_cmb":0.0226001147436538,"uncertainties":{"distance_ly":[18249220.32577601,18253708.0303605],"stellar_mass_solar":[5604764713.662053,5604764713.662053]},"major_axis_arcmin":0.906583,"minor_axis_arcmin":0.77803,"morphology_source":"SIMBAD (2015MNRAS.446.3749Y, quality D)","position_angle_deg":45,"stellar_mass_solar":44838117709.296425},"designations":[{"catalog":"2MASX","designation":"2MASX 12093291+1700510"},{"catalog":"PGC","designation":"PGC 38634"},{"catalog":"WISExSCOS","designation":"WISExSCOS J120932.91+170051.3"}],"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":"2026-09-01T22:58:55.274Z","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."}