{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T23:37:11.964Z","years_from_j2000":26.676,"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-941637","name":"PGC 941637","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":14.896,"mag_band":"B","abs_mag":-19.949704175049135,"abs_mag_band":"B","distance_ly":303785268.83737004,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":203.161346,"dec_deg":-13.179832,"epoch_ra_deg":203.518923,"epoch_dec_deg":-13.318025,"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":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-941637","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.896,"h_mag":12.227,"j_mag":12.881,"k_mag":11.876,"redshift":0.0223,"redshift_cmb":0.0214010085960172,"uncertainties":{"distance_ly":[17627331.7722179,17631938.74085306],"stellar_mass_solar":[3736537963.337593,3736537963.337593]},"stellar_mass_solar":9341344908.343983},"designations":[{"catalog":"2MASX","designation":"2MASX 13323872-1310473"},{"catalog":"PGC","designation":"PGC 941637"},{"catalog":"WISExSCOS","designation":"WISExSCOS J133238.73-131047.5"}],"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":"2026-09-02T19:50:56.720Z","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."}