{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T15:36:40.526Z","years_from_j2000":26.67,"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-16826","name":"PGC 16826","class":"irregular_galaxy_irr","category":"galaxy","object_type":"Irregular galaxy Irr","mag":13.99,"mag_band":"B","abs_mag":-18.141552970518283,"abs_mag_band":"B","distance_ly":87043524.79695179,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":77.2895,"dec_deg":-9.26017,"epoch_ra_deg":77.609854,"epoch_dec_deg":-9.225441,"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":"Eridanus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-16826","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.99,"redshift":0.00751086375543,"hubble_type":"Irr","redshift_cmb":0.0062021302664198,"uncertainties":{"distance_ly":[21709311.65375166,21755900.265584707],"stellar_mass_solar":[28026714.7887249,28026714.7887249]},"major_axis_arcmin":2.24,"minor_axis_arcmin":0.59,"morphology_source":"SIMBAD (2003A&A...412...45P, quality E)","position_angle_deg":115,"stellar_mass_solar":46711191.314541504},"designations":[{"catalog":"PGC","designation":"PGC 16826"},{"catalog":"WISExSCOS","designation":"WISExSCOS J050909.42-091537.8"}],"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."}