{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T14:00:24.881Z","years_from_j2000":26.67,"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-23907","name":"PGC 23907","class":"spiral_galaxy_sm_im","category":"galaxy","object_type":"Spiral galaxy Sm/Im","mag":15.9,"mag_band":"B","abs_mag":-16.48283141159981,"abs_mag_band":"B","distance_ly":97721957.42074847,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":127.84,"dec_deg":6.99999,"epoch_ra_deg":128.198551,"epoch_dec_deg":6.90974,"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":"Cancer","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-23907","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.9,"redshift":0.00598731299366,"hubble_type":"Sm/Im","redshift_cmb":0.0069590195655959,"uncertainties":{"distance_ly":[17553189.823526602,17582392.791146945],"stellar_mass_solar":[37368775.93078284,37368775.93078284]},"major_axis_arcmin":0.5466,"minor_axis_arcmin":0.421046,"morphology_source":"SIMBAD (2015ApJS..217...27A, quality C)","position_angle_deg":176,"stellar_mass_solar":65395357.878869966},"designations":[{"catalog":"PGC","designation":"PGC 23907"},{"catalog":"WISExSCOS","designation":"WISExSCOS J083121.60+070000.6"}],"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."}