{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T13:34:08.169Z","years_from_j2000":26.686,"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-8409","name":"UGC 8409","class":"spiral_galaxy_sadm","category":"galaxy","object_type":"Spiral galaxy SAdm","mag":14.1,"mag_band":"B","abs_mag":-18.909074858309445,"abs_mag_band":"B","distance_ly":130388967.66233158,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":200.753571,"dec_deg":23.306301,"epoch_ra_deg":201.075868,"epoch_dec_deg":23.165734,"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":"Coma Berenices","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ugc-8409","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.1,"h_mag":14.531,"j_mag":15.126,"k_mag":14.175,"redshift":0.00910203455102,"hubble_type":"SAdm","redshift_cmb":0.0092691516106941,"uncertainties":{"distance_ly":[26482833.16994521,26550867.13718277],"stellar_mass_solar":[93420577.72057973,93420577.72057973]},"major_axis_arcmin":1.11869,"minor_axis_arcmin":0.663833,"morphology_source":"SIMBAD (2015ApJS..217...27A, quality C)","position_angle_deg":76,"stellar_mass_solar":186841155.44115946},"designations":[{"catalog":"2MASX","designation":"2MASX 13230085+2318226"},{"catalog":"PGC","designation":"PGC 46753"},{"catalog":"WISExSCOS","designation":"WISExSCOS J132300.86+231822.9"}],"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."}