{"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":"2026-09-02T12:18:38.785Z","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-53694","name":"PGC 53694","class":"spiral_galaxy","category":"galaxy","object_type":"Spiral galaxy","mag":16.32,"mag_band":"B","abs_mag":-17.94991364266692,"abs_mag_band":"B","distance_ly":233028266.11429286,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":225.59317,"dec_deg":41.921738,"epoch_ra_deg":225.842715,"epoch_dec_deg":41.815726,"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":"Boötes","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-53694","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.32,"h_mag":14.773,"j_mag":15.178,"k_mag":14.148,"redshift":0.0164730382365,"hubble_type":"5.24","redshift_cmb":0.0164764437556289,"uncertainties":{"distance_ly":[48138110.12166205,48360324.67966663],"stellar_mass_solar":[373665368.4754472,373665368.4754472]},"major_axis_arcmin":0.73843,"minor_axis_arcmin":0.357326,"morphology_source":"SIMBAD (2022MNRAS.513..389R, quality C)","position_angle_deg":105,"stellar_mass_solar":653914394.8320327},"designations":[{"catalog":"2MASX","designation":"2MASX 15022236+4155182"},{"catalog":"PGC","designation":"PGC 53694"},{"catalog":"WISExSCOS","designation":"WISExSCOS J150222.17+415518.6"}],"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."}