{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T04:11:53.924Z","years_from_j2000":26.682,"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":"ugc-6528","name":"UGC 6528","class":"intermediate_spiral_galaxy_sab","category":"galaxy","object_type":"Intermediate spiral galaxy SAB","mag":14.13,"mag_band":"B","abs_mag":-19.43016885828205,"abs_mag_band":"B","distance_ly":168058176.46343166,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":173.183441,"dec_deg":61.826805,"epoch_ra_deg":173.564055,"epoch_dec_deg":61.678496,"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":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ugc-6528","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.13,"h_mag":11.799,"j_mag":12.429,"k_mag":11.645,"redshift":0.01084,"hubble_type":"SAB","redshift_cmb":0.0119231933860368,"uncertainties":{"distance_ly":[9222071.322750723,9223079.627674658],"stellar_mass_solar":[467095095.3307081,467095095.3307081]},"major_axis_arcmin":1.19125,"minor_axis_arcmin":1.08809,"morphology_source":"SIMBAD (2019MNRAS.488..590B, quality C)","position_angle_deg":160,"stellar_mass_solar":1027609209.7275578},"designations":[{"catalog":"2MASX","designation":"2MASX 11324402+6149364"},{"catalog":"PGC","designation":"PGC 35626"},{"catalog":"WISExSCOS","designation":"WISExSCOS J113244.04+614937.1"}],"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."}