{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T20:23:09.664Z","years_from_j2000":26.654,"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":"ugc04305","name":"UGC04305","class":"irregular_galaxy_i","category":"galaxy","object_type":"Irregular galaxy I","mag":10.75,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":124.77074999999999,"dec_deg":70.72002777777777,"epoch_ra_deg":125.467123,"epoch_dec_deg":70.635947,"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/ugc04305","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":11.16,"h_mag":8.92,"j_mag":10.09,"k_mag":8.8,"v_mag":10.75,"redshift":0.000524,"hubble_type":"I","redshift_cmb":0.0006781783142428832,"ngc_type_code":"G","major_axis_arcmin":7.94,"minor_axis_arcmin":5.62,"position_angle_deg":15,"surface_brightness":24.08,"radial_velocity_km_s":157},"designations":[{"catalog":"2MASX","designation":"2MASX J08190497+7043121"},{"catalog":"IRAS","designation":"IRAS 08140+7052"},{"catalog":"MCG","designation":"MCG +12-08-033"},{"catalog":"OpenNGC","designation":"UGC04305"},{"catalog":"PGC","designation":"PGC 23324"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}