{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-02T02:47:04.585Z","years_from_j2000":26.668,"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-21241","name":"PGC 21241","class":"spiral_galaxy_scd","category":"galaxy","object_type":"Spiral galaxy Scd","mag":15.314,"mag_band":"B","abs_mag":-20.898614935327423,"abs_mag_band":"B","distance_ly":570097139.9805474,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":113.136261,"dec_deg":36.201771,"epoch_ra_deg":113.581259,"epoch_dec_deg":36.144629,"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":"Lynx","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-21241","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.314,"h_mag":13.074,"j_mag":13.778,"k_mag":12.699,"redshift":0.040284,"hubble_type":"Scd","redshift_cmb":0.0396314621778578,"uncertainties":{"distance_ly":[120904530.4506038,122202993.90444225],"stellar_mass_solar":[9340275821.325535,9340275821.325535]},"major_axis_arcmin":0.846067,"minor_axis_arcmin":0.214139,"morphology_source":"SIMBAD (2006A&A...445..765K, quality D)","position_angle_deg":131,"stellar_mass_solar":18680551642.65107},"designations":[{"catalog":"2MASX","designation":"2MASX 07323270+3612063"},{"catalog":"PGC","designation":"PGC 21241"},{"catalog":"WISExSCOS","designation":"WISExSCOS J073232.76+361205.8"}],"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."}