{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T05:47:00.405Z","years_from_j2000":26.669,"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-47301","name":"PGC 47301","class":"intermediate_spiral_galaxy_sabd","category":"galaxy","object_type":"Intermediate spiral galaxy SABd","mag":15.641,"mag_band":"B","abs_mag":-17.516381762481195,"abs_mag_band":"B","distance_ly":139605403.33869028,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":202.203735,"dec_deg":45.730083,"epoch_ra_deg":202.491764,"epoch_dec_deg":45.590962,"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":"Canes Venatici","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-47301","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.641,"h_mag":13.9,"j_mag":14.714,"k_mag":13.643,"redshift":0.00853,"hubble_type":"SABd","redshift_cmb":0.0099194776226358,"uncertainties":{"distance_ly":[7356253.409147156,7356868.885554166],"stellar_mass_solar":[93420197.24674048,93420197.24674048]},"major_axis_arcmin":0.754363,"minor_axis_arcmin":0.276474,"morphology_source":"SIMBAD (2015ApJS..217...27A, quality C)","position_angle_deg":172,"stellar_mass_solar":280260591.74022144},"designations":[{"catalog":"2MASX","designation":"2MASX 13284889+4543482"},{"catalog":"PGC","designation":"PGC 47301"},{"catalog":"WISExSCOS","designation":"WISExSCOS J132848.88+454347.9"}],"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."}