{"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":"2026-09-03T12:27:03.473Z","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-2992","name":"NGC 2992","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":13.1,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":118721913.27418584,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":146.42520833333333,"dec_deg":-14.32638888888889,"epoch_ra_deg":146.747649,"epoch_dec_deg":-14.449907,"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":"Hydra","discovered":"1785","featured":false,"url":"https://spacecatalog.org/object/ngc-2992","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.06,"h_mag":8.93,"j_mag":9.67,"k_mag":8.6,"v_mag":13.1,"redshift":0.007296,"hubble_type":"Sa","wikidata_id":"Q1102305","redshift_cmb":0.00844500096819445,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14858775.271957042,14858775.271957042]},"major_axis_arcmin":2.92,"minor_axis_arcmin":0.69,"wikipedia_article":"NGC 2992","position_angle_deg":17,"surface_brightness":23.55,"radial_velocity_km_s":2179},"designations":[{"catalog":"2MASX","designation":"2MASX J09454204-1419348"},{"catalog":"IRAS","designation":"IRAS 09432-1405"},{"catalog":"LEDA","designation":"LEDA 27982"},{"catalog":"MCG","designation":"MCG -02-25-014"},{"catalog":"NGC","designation":"NGC 2992"},{"catalog":"PGC","designation":"PGC 27982"}],"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."}