{"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":"2026-09-03T08:23:00.745Z","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-3073","name":"NGC 3073","class":"elliptical_galaxy_e_s0","category":"galaxy","object_type":"Elliptical galaxy E-S0","mag":13.43,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":62661364.37490651,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":150.217,"dec_deg":55.618833333333335,"epoch_ra_deg":150.671464,"epoch_dec_deg":55.489931,"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":"1790","featured":false,"url":"https://spacecatalog.org/object/ngc-3073","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.1,"h_mag":11.01,"j_mag":11.8,"k_mag":10.8,"v_mag":13.43,"redshift":0.003933,"hubble_type":"E-S0","wikidata_id":"Q1102810","redshift_cmb":0.004470682415568694,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14251122.235608347,14251122.235608347]},"major_axis_arcmin":1.2,"minor_axis_arcmin":1.07,"wikipedia_article":"NGC 3073","position_angle_deg":130,"surface_brightness":23.25,"radial_velocity_km_s":1177},"designations":[{"catalog":"2MASX","designation":"2MASX J10005204+5537081"},{"catalog":"LEDA","designation":"LEDA 28974"},{"catalog":"MCG","designation":"MCG +09-17-007"},{"catalog":"NGC","designation":"NGC 3073"},{"catalog":"PGC","designation":"PGC 28974"},{"catalog":"SDSS","designation":"SDSS J100052.08+553707.7"},{"catalog":"SDSS","designation":"SDSS J100052.08+553707.8"},{"catalog":"UGC","designation":"UGC 5374"}],"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."}