{"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":"2026-09-02T01:20:52.335Z","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-31358","name":"PGC 31358","class":"elliptical_galaxy","category":"galaxy","object_type":"Elliptical galaxy","mag":13.784,"mag_band":"B","abs_mag":-21.102855038729317,"abs_mag_band":"B","distance_ly":309597099.2635389,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":158.985458,"dec_deg":72.616272,"epoch_ra_deg":159.504795,"epoch_dec_deg":72.477323,"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 Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-31358","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.784,"h_mag":10.597,"j_mag":11.324,"k_mag":10.325,"redshift":0.02196,"hubble_type":"-4.9","redshift_cmb":0.0218039435808399,"uncertainties":{"distance_ly":[16854254.24367854,16858856.0372195],"stellar_mass_solar":[6538924852.28657,6538924852.28657]},"major_axis_arcmin":1.26878,"minor_axis_arcmin":1.15141,"morphology_source":"SIMBAD (2001ApJ...560..566K, quality D)","position_angle_deg":0,"stellar_mass_solar":52311398818.29256},"designations":[{"catalog":"2MASX","designation":"2MASX 10355650+7236585"},{"catalog":"PGC","designation":"PGC 31358"},{"catalog":"WISExSCOS","designation":"WISExSCOS J103556.52+723658.9"}],"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":"2026-09-01T22:58:55.274Z","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."}