{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T19:58:08.730Z","years_from_j2000":26.67,"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-4672","name":"NGC 4672","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":14.25,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":168868226.1472215,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":191.565625,"dec_deg":-41.70597222222222,"epoch_ra_deg":191.934831,"epoch_dec_deg":-41.852787,"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":"Centaurus","discovered":"1834","featured":false,"url":"https://spacecatalog.org/object/ngc-4672","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.04,"h_mag":10.03,"j_mag":10.81,"k_mag":9.75,"v_mag":14.25,"redshift":0.011033,"hubble_type":"Sa","wikidata_id":"Q1113358","redshift_cmb":0.011980152064473781,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15660252.221539259,15660252.221539259]},"major_axis_arcmin":2.06,"minor_axis_arcmin":0.5,"position_angle_deg":59,"surface_brightness":23.74,"radial_velocity_km_s":3290},"designations":[{"catalog":"2MASX","designation":"2MASX J12461573-4142214"},{"catalog":"ESO","designation":"ESO 322-073"},{"catalog":"ESO","designation":"ESO 322-73"},{"catalog":"ESO-LV","designation":"ESO-LV 322-0730"},{"catalog":"IRAS","designation":"IRAS 12435-4125"},{"catalog":"IRAS","designation":"IRAS 12435-4126"},{"catalog":"LEDA","designation":"LEDA 43073"},{"catalog":"MCG","designation":"MCG -07-26-041"},{"catalog":"NGC","designation":"NGC 4672"},{"catalog":"PGC","designation":"PGC 43073"}],"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."}