{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T15:32:30.035Z","years_from_j2000":26.667,"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-66634","name":"PGC 66634","class":"elliptical_galaxy","category":"galaxy","object_type":"Elliptical galaxy","mag":14.458,"mag_band":"B","abs_mag":-19.995123827980443,"abs_mag_band":"B","distance_ly":253542425.58059987,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":320.453644,"dec_deg":10.656183,"epoch_ra_deg":320.779351,"epoch_dec_deg":10.770237,"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":"Equuleus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-66634","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.458,"h_mag":11.217,"j_mag":11.928,"k_mag":11.02,"redshift":0.01671,"hubble_type":"-5","redshift_cmb":0.0179078288461923,"uncertainties":{"distance_ly":[12927187.960993066,12929828.148739824],"stellar_mass_solar":[2802465012.7635055,2802465012.7635055]},"major_axis_arcmin":1.07414,"minor_axis_arcmin":0.759954,"morphology_source":"SIMBAD (2010ApJS..186..427N, quality D)","position_angle_deg":139,"stellar_mass_solar":20551410093.59904},"designations":[{"catalog":"2MASX","designation":"2MASX 21214887+1039222"},{"catalog":"PGC","designation":"PGC 66634"},{"catalog":"WISExSCOS","designation":"WISExSCOS J212148.84+103921.8"}],"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":"2026-08-30T09:56:50.739Z","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."}