{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.689","julian_year":2026.689,"time":"2026-09-09T15:19:08.741Z","years_from_j2000":26.689,"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-2775","name":"UGC 2775","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":15.001,"mag_band":"B","abs_mag":-18.546684811026672,"abs_mag_band":"B","distance_ly":167094762.51782998,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":53.023491,"dec_deg":41.591431,"epoch_ra_deg":53.473144,"epoch_dec_deg":41.682816,"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":"Perseus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ugc-2775","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.001,"h_mag":11.29,"j_mag":12.039,"k_mag":11.02,"redshift":0.01468,"hubble_type":"Sc","redshift_cmb":0.0118554446405817,"uncertainties":{"distance_ly":[25517735.794572506,25518640.847534895],"stellar_mass_solar":[934190567.9819404,934190567.9819404]},"major_axis_arcmin":0.75,"minor_axis_arcmin":0.525,"morphology_source":"SIMBAD (2003A&A...412...45P, quality E)","position_angle_deg":150,"stellar_mass_solar":2802571703.945821},"designations":[{"catalog":"2MASX","designation":"2MASX 03320563+4135291"},{"catalog":"PGC","designation":"PGC 13113"},{"catalog":"WISExSCOS","designation":"WISExSCOS J033205.61+413529"}],"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":"2026-09-09T11:17:28.634Z","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."}