{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-02T01:55:43.901Z","years_from_j2000":26.668,"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-20229","name":"PGC 20229","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":15.469,"mag_band":"B","abs_mag":-18.92968315340608,"abs_mag_band":"B","distance_ly":247264919.68133575,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":107.100807,"dec_deg":50.136662,"epoch_ra_deg":107.616343,"epoch_dec_deg":50.094273,"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":"Lynx","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-20229","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.469,"h_mag":11.635,"j_mag":12.343,"k_mag":11.319,"redshift":0.01917,"redshift_cmb":0.0174701304062844,"uncertainties":{"distance_ly":[14072824.046926063,14076485.21187552],"stellar_mass_solar":[2802472788.4973984,2802472788.4973984]},"stellar_mass_solar":17748994327.15019},"designations":[{"catalog":"2MASX","designation":"2MASX 07082419+5008119"},{"catalog":"PGC","designation":"PGC 20229"},{"catalog":"WISExSCOS","designation":"WISExSCOS J070824.17+500811.5"}],"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":"2026-09-01T22:58:55.274Z","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."}