{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T21:57:50.478Z","years_from_j2000":26.654,"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-52953","name":"PGC 52953","class":"lenticular_galaxy","category":"galaxy","object_type":"Lenticular galaxy","mag":15.835,"mag_band":"B","abs_mag":-18.14260639008846,"abs_mag_band":"B","distance_ly":203679421.69661373,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":222.43663,"dec_deg":50.710968,"epoch_ra_deg":222.659386,"epoch_dec_deg":50.599306,"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-52953","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.835,"h_mag":12.588,"j_mag":13.188,"k_mag":12.247,"redshift":0.01342,"hubble_type":"-1.35","redshift_cmb":0.0144233866039561,"uncertainties":{"distance_ly":[10422982.782796232,10424677.005326936],"stellar_mass_solar":[1868351005.2223938,1868351005.2223938]},"major_axis_arcmin":0.367937,"minor_axis_arcmin":0.328862,"morphology_source":"SIMBAD (2022MNRAS.513..389R, quality C)","position_angle_deg":1,"stellar_mass_solar":3736702010.4447875},"designations":[{"catalog":"2MASX","designation":"2MASX 14494479+5042394"},{"catalog":"PGC","designation":"PGC 52953"},{"catalog":"WISExSCOS","designation":"WISExSCOS J144944.82+504239"}],"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":"2026-08-27T19:16:43.430Z","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."}