{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T09:00:07.974Z","years_from_j2000":26.672,"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-47949","name":"PGC 47949","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":14.432,"mag_band":"B","abs_mag":-19.498673333405115,"abs_mag_band":"B","distance_ly":199324435.0748183,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":203.971069,"dec_deg":-4.92703,"epoch_ra_deg":204.320275,"epoch_dec_deg":-5.064379,"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-47949","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.432,"h_mag":12.161,"j_mag":12.694,"k_mag":11.934,"redshift":0.014343,"redshift_cmb":0.0141182116271389,"uncertainties":{"distance_ly":[41754243.83726033,41923260.85697779],"stellar_mass_solar":[934177283.9619863,934177283.9619863]},"stellar_mass_solar":1868354567.9239726},"designations":[{"catalog":"2MASX","designation":"2MASX 13355305-0455373"},{"catalog":"PGC","designation":"PGC 47949"},{"catalog":"WISExSCOS","designation":"WISExSCOS J133553.10-045536.3"}],"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."}