{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T12:42:41.640Z","years_from_j2000":26.678,"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-6955","name":"UGC 6955","class":"spiral_galaxy_sa_b","category":"galaxy","object_type":"Spiral galaxy SA_B","mag":12.9,"mag_band":"B","abs_mag":-17.765280541439488,"abs_mag_band":"B","distance_ly":44307983.3148731,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":179.625,"dec_deg":38.07605,"epoch_ra_deg":179.971353,"epoch_dec_deg":37.926524,"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-6955","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.9,"redshift":0.00374094187047,"hubble_type":"SA_B","redshift_cmb":0.0031643655550885,"uncertainties":{"distance_ly":[11992732.60145755,12003147.122604266],"stellar_mass_solar":[6539691.632818195,6539691.632818195]},"major_axis_arcmin":2.36835,"minor_axis_arcmin":0.937394,"morphology_source":"SIMBAD (2019MNRAS.488..590B, quality C)","position_angle_deg":68,"stellar_mass_solar":9342416.618311707},"designations":[{"catalog":"PGC","designation":"PGC 37689"},{"catalog":"WISExSCOS","designation":"WISExSCOS J115829.91+380434.7"}],"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."}