{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T14:08:46.218Z","years_from_j2000":26.681,"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-1849639","name":"PGC 1849639","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":16.249,"mag_band":"B","abs_mag":-18.35634723561081,"abs_mag_band":"B","distance_ly":271953919.45172155,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":195.92572,"dec_deg":28.905529,"epoch_ra_deg":196.248329,"epoch_dec_deg":28.76119,"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-1849639","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.249,"h_mag":13.006,"j_mag":13.689,"k_mag":12.771,"redshift":0.02232,"hubble_type":"Sa","redshift_cmb":0.0191899615741018,"uncertainties":{"distance_ly":[19024920.658278145,19029197.739754114],"stellar_mass_solar":[653903244.3335124,653903244.3335124]},"major_axis_arcmin":0.518987,"minor_axis_arcmin":0.278021,"morphology_source":"SIMBAD (quality D)","position_angle_deg":162,"stellar_mass_solar":5418055453.049103},"designations":[{"catalog":"2MASX","designation":"2MASX 13034217+2854199"},{"catalog":"PGC","designation":"PGC 1849639"},{"catalog":"WISExSCOS","designation":"WISExSCOS J130342.19+285420.9"}],"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."}