{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T19:33:57.433Z","years_from_j2000":26.665,"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-56045","name":"PGC 56045","class":"spiral_galaxy","category":"galaxy","object_type":"Spiral galaxy","mag":15.07,"mag_band":"B","abs_mag":-19.208495506855748,"abs_mag_band":"B","distance_ly":233951038.08549052,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":236.884,"dec_deg":21.70741,"epoch_ra_deg":237.178662,"epoch_dec_deg":21.624131,"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":"Serpens","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-56045","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.07,"h_mag":13.322,"j_mag":13.978,"k_mag":13.153,"redshift":0.0166248683124,"hubble_type":"3","redshift_cmb":0.0165408949327862,"uncertainties":{"distance_ly":[48525096.91034354,48751688.693129726],"stellar_mass_solar":[934163047.6918005,934163047.6918005]},"major_axis_arcmin":0.69068,"minor_axis_arcmin":0.670996,"morphology_source":"SIMBAD (2005ApJS..160..149S, quality D)","position_angle_deg":81,"stellar_mass_solar":1868326095.383601},"designations":[{"catalog":"2MASX","designation":"2MASX 15473226+2142273"},{"catalog":"PGC","designation":"PGC 56045"}],"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":"2026-08-30T09:56:50.739Z","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."}