{"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":"2026-09-07T01:13:19.533Z","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-10249","name":"UGC 10249","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":15.693,"mag_band":"B","abs_mag":-20.122423413810225,"abs_mag_band":"B","distance_ly":474799833.4828023,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":242.820862,"dec_deg":13.866058,"epoch_ra_deg":243.13255,"epoch_dec_deg":13.796054,"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":"Hercules","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ugc-10249","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.693,"h_mag":11.546,"j_mag":12.325,"k_mag":11.144,"redshift":0.03481,"redshift_cmb":0.0331614852006404,"uncertainties":{"distance_ly":[28733147.648547016,28743933.709451053],"stellar_mass_solar":[28021964731.9054,28021964731.9054]},"stellar_mass_solar":56043929463.8108},"designations":[{"catalog":"2MASX","designation":"2MASX 16111700+1351578"},{"catalog":"WISExSCOS","designation":"WISExSCOS J161117.00+135157.7"}],"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":"2026-09-02T19:50:56.720Z","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."}