{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-05T00:16:45.444Z","years_from_j2000":26.676,"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-1391833","name":"PGC 1391833","class":"spiral_galaxy","category":"galaxy","object_type":"Spiral galaxy","mag":15.823,"mag_band":"B","abs_mag":-19.155297103386665,"abs_mag_band":"B","distance_ly":322912826.35749346,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":178.759262,"dec_deg":11.316465,"epoch_ra_deg":179.104396,"epoch_dec_deg":11.167011,"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":"Leo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-1391833","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.823,"h_mag":12.031,"j_mag":12.879,"k_mag":11.741,"redshift":0.02199,"hubble_type":"3","redshift_cmb":0.0227262429257146,"uncertainties":{"distance_ly":[18380981.319416482,18385219.509557195],"stellar_mass_solar":[5604760282.7672205,5604760282.7672205]},"major_axis_arcmin":0.88623,"minor_axis_arcmin":0.188678,"morphology_source":"SIMBAD (2019MNRAS.487.5572M, quality D)","position_angle_deg":38,"stellar_mass_solar":13077773993.123514},"designations":[{"catalog":"2MASX","designation":"2MASX 11550222+1118592"},{"catalog":"PGC","designation":"PGC 1391833"},{"catalog":"WISExSCOS","designation":"WISExSCOS J115502.24+111859.2"}],"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."}