{"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":"2026-09-02T04:33:45.674Z","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-2639","name":"PGC 2639","class":"lenticular_galaxy_so","category":"galaxy","object_type":"Lenticular galaxy SO","mag":14.967,"mag_band":"B","abs_mag":-19.217769692698475,"abs_mag_band":"B","distance_ly":224067987.6307068,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":11.107462,"dec_deg":16.813349,"epoch_ra_deg":11.459654,"epoch_dec_deg":16.960381,"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":"Pisces","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-2639","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.967,"h_mag":11.462,"j_mag":12.17,"k_mag":11.223,"redshift":0.01497,"hubble_type":"SO","redshift_cmb":0.0158502951572767,"uncertainties":{"distance_ly":[12444809.537423948,12446780.127704235],"stellar_mass_solar":[1868334227.750528,1868334227.750528]},"major_axis_arcmin":0.56802,"minor_axis_arcmin":0.535529,"morphology_source":"SIMBAD (2003A&A...412...45P, quality E)","position_angle_deg":17,"stellar_mass_solar":17749175163.630016},"designations":[{"catalog":"2MASX","designation":"2MASX 00442579+1648480"},{"catalog":"PGC","designation":"PGC 2639"},{"catalog":"WISExSCOS","designation":"WISExSCOS J004425.77+164848.4"}],"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."}