{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T20:18:07.242Z","years_from_j2000":26.673,"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-2997","name":"NGC 2997","class":"intermediate_spiral_galaxy_sabc","category":"galaxy","object_type":"Intermediate spiral galaxy SABc","mag":9.41,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":65415259.95113736,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":146.41162500000002,"dec_deg":-31.191083333333335,"epoch_ra_deg":146.70453,"epoch_dec_deg":-31.314567,"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":"Antlia","discovered":"1793","featured":false,"url":"https://spacecatalog.org/object/ngc-2997","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":10.04,"h_mag":6.67,"j_mag":7.33,"k_mag":6.41,"v_mag":9.41,"redshift":0.003611,"hubble_type":"SABc","wikidata_id":"Q178829","redshift_cmb":0.004666470943087475,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14273238.36922876,14273238.36922876]},"major_axis_arcmin":10.26,"minor_axis_arcmin":6.21,"wikipedia_article":"NGC 2997","position_angle_deg":97,"surface_brightness":23.42,"radial_velocity_km_s":1081},"designations":[{"catalog":"2MASX","designation":"2MASX J09453879-3111279"},{"catalog":"ESO","designation":"ESO 434-035"},{"catalog":"ESO","designation":"ESO 434-35"},{"catalog":"ESO-LV","designation":"ESO-LV 434-0350"},{"catalog":"LEDA","designation":"LEDA 27978"},{"catalog":"MCG","designation":"MCG -05-23-012"},{"catalog":"NGC","designation":"NGC 2997"},{"catalog":"PGC","designation":"PGC 27978"},{"catalog":"UGCA","designation":"UGCA 181"}],"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."}