{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T05:50:37.978Z","years_from_j2000":26.674,"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-12539","name":"PGC 12539","class":"barred_spiral_galaxy_sba","category":"galaxy","object_type":"Barred spiral galaxy SBa","mag":14.298,"mag_band":"B","abs_mag":-20.478165726507676,"abs_mag_band":"B","distance_ly":294211077.4697401,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":50.189228,"dec_deg":-1.044659,"epoch_ra_deg":50.531337,"epoch_dec_deg":-0.947517,"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":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-12539","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.298,"h_mag":10.841,"j_mag":11.574,"k_mag":10.548,"redshift":0.02139,"hubble_type":"SBa","redshift_cmb":0.0207367167640681,"uncertainties":{"distance_ly":[15671775.086991083,15676347.058392819],"stellar_mass_solar":[9341383953.23752,9341383953.23752]},"major_axis_arcmin":1.18477,"minor_axis_arcmin":0.68148,"morphology_source":"SIMBAD (quality D)","position_angle_deg":171,"stellar_mass_solar":28024151859.712563},"designations":[{"catalog":"2MASX","designation":"2MASX 03204541-0102407"},{"catalog":"PGC","designation":"PGC 12539"},{"catalog":"WISExSCOS","designation":"WISExSCOS J032045.41-010240.9"}],"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."}