{"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":"2026-09-08T15:49:26.362Z","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-4238","name":"UGC 4238","class":"spiral_galaxy_sd_im","category":"galaxy","object_type":"Spiral galaxy Sd-Im","mag":12.6,"mag_band":"B","abs_mag":-19.183428370790445,"abs_mag_band":"B","distance_ly":74150067.27074045,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":122.903145,"dec_deg":76.421738,"epoch_ra_deg":123.768598,"epoch_dec_deg":76.34146,"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":"Camelopardalis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ugc-4238","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.6,"h_mag":11.745,"j_mag":12.365,"k_mag":11.587,"redshift":0.00483735241868,"hubble_type":"Sd-Im","redshift_cmb":0.0052870909479635,"uncertainties":{"distance_ly":[5860021.418701528,5860162.085143677],"stellar_mass_solar":[93422919.03405586,93422919.03405586]},"major_axis_arcmin":3.58005,"minor_axis_arcmin":1.29526,"morphology_source":"SIMBAD (2018ApJ...864..123M, quality D)","position_angle_deg":77,"stellar_mass_solar":186845838.06811172},"designations":[{"catalog":"2MASX","designation":"2MASX 08113675+7625182"},{"catalog":"PGC","designation":"PGC 22969"},{"catalog":"WISExSCOS","designation":"WISExSCOS J081136.69+762516.8"}],"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."}