{"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":"2026-09-02T04:16:24.581Z","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-43739","name":"PGC 43739","class":"irregular_galaxy_di","category":"galaxy","object_type":"Irregular galaxy dI","mag":16.6,"mag_band":"B","abs_mag":-13.882401718742393,"abs_mag_band":"B","distance_ly":40729231.808063485,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":193.246,"dec_deg":14.40041,"epoch_ra_deg":193.581718,"epoch_dec_deg":14.254483,"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":"Coma Berenices","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-43739","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.6,"redshift":0.00371511185756,"hubble_type":"dI","redshift_cmb":0.0029093439182761,"uncertainties":{"distance_ly":[12272167.845559819,12282135.123356191],"stellar_mass_solar":[2802729.4996228996,2802729.4996228996]},"major_axis_arcmin":0.358503,"minor_axis_arcmin":0.180972,"morphology_source":"SIMBAD (2015ApJS..217...27A, quality C)","position_angle_deg":26,"stellar_mass_solar":3736972.666163867},"designations":[{"catalog":"PGC","designation":"PGC 43739"},{"catalog":"WISExSCOS","designation":"WISExSCOS J125259.11+142401.8"}],"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."}