{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T05:04:52.152Z","years_from_j2000":26.685,"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-11818","name":"UGC 11818","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy SAb","mag":13.345,"mag_band":"B","abs_mag":-19.5739809334331,"abs_mag_band":"B","distance_ly":125089847.16418085,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":326.817291,"dec_deg":72.472122,"epoch_ra_deg":326.895491,"epoch_dec_deg":72.596113,"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":"Cepheus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ugc-11818","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.345,"h_mag":10.109,"j_mag":10.92,"k_mag":9.675,"redshift":0.00801,"hubble_type":"SAb","redshift_cmb":0.0088949519188431,"uncertainties":{"distance_ly":[7208291.2832895415,7208811.187510596],"stellar_mass_solar":[1868415965.4058561,1868415965.4058561]},"major_axis_arcmin":1.12,"minor_axis_arcmin":0.739,"morphology_source":"SIMBAD (2015ApJS..217...27A, quality C)","position_angle_deg":125,"stellar_mass_solar":4671039913.51464},"designations":[{"catalog":"2MASX","designation":"2MASX 21471614+7228196"},{"catalog":"PGC","designation":"PGC 67347"},{"catalog":"WISExSCOS","designation":"WISExSCOS J214716.11+722819.9"}],"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."}