{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T23:04:45.973Z","years_from_j2000":26.668,"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-28409","name":"PGC 28409","class":"barred_spiral_galaxy_sb","category":"galaxy","object_type":"Barred spiral galaxy SB","mag":15.078,"mag_band":"B","abs_mag":-20.258298535233198,"abs_mag_band":"B","distance_ly":380790041.6349187,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":147.974243,"dec_deg":14.932043,"epoch_ra_deg":148.339696,"epoch_dec_deg":14.806291,"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-28409","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.078,"h_mag":13.114,"j_mag":13.784,"k_mag":12.862,"redshift":0.0269,"hubble_type":"SB","redshift_cmb":0.0267209165792721,"uncertainties":{"distance_ly":[79517763.53021067,80104616.80742499],"stellar_mass_solar":[2802309813.6218657,2802309813.6218657]},"major_axis_arcmin":0.999907,"minor_axis_arcmin":0.557148,"morphology_source":"SIMBAD (2019MNRAS.488.2175B, quality C)","position_angle_deg":89,"stellar_mass_solar":4670516356.036443},"designations":[{"catalog":"2MASX","designation":"2MASX 09515381+1455553"},{"catalog":"PGC","designation":"PGC 28409"},{"catalog":"WISExSCOS","designation":"WISExSCOS J095153.84+145555.7"}],"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."}