{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T12:34:20.652Z","years_from_j2000":26.672,"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":"ngc-3301","name":"NGC 3301","class":"lenticular_galaxy_s0_a","category":"galaxy","object_type":"Lenticular galaxy S0-a","mag":11.41,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":77463701.8840674,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":159.2335,"dec_deg":21.88213888888889,"epoch_ra_deg":159.599446,"epoch_dec_deg":21.742999,"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":"Leo","discovered":"1784","featured":false,"url":"https://spacecatalog.org/object/ngc-3301","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.29,"h_mag":8.75,"j_mag":9.39,"k_mag":8.52,"v_mag":11.41,"redshift":0.00445,"hubble_type":"S0-a","wikidata_id":"Q1104130","redshift_cmb":0.0055223774866159925,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14379658.304738915,14379658.304738915]},"major_axis_arcmin":3.63,"minor_axis_arcmin":1.06,"wikipedia_article":"NGC 3301","position_angle_deg":53,"surface_brightness":23.66,"radial_velocity_km_s":1331},"designations":[{"catalog":"2MASX","designation":"2MASX J10365603+2152557"},{"catalog":"IRAS","designation":"IRAS 10341+2208"},{"catalog":"IRAS","designation":"IRAS F10342+2208"},{"catalog":"LEDA","designation":"LEDA 31497"},{"catalog":"MCG","designation":"MCG +04-25-035"},{"catalog":"NGC","designation":"NGC 3301"},{"catalog":"NGC","designation":"NGC 3760"},{"catalog":"PGC","designation":"PGC 31497"},{"catalog":"UGC","designation":"UGC 5767"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"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."}