{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-05T00:08:54.605Z","years_from_j2000":26.676,"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-4943","name":"NGC 4943","class":"lenticular_galaxy_s0","category":"galaxy","object_type":"Lenticular galaxy S0","mag":15.46,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":278860641.3409641,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":195.93725,"dec_deg":28.08422222222222,"epoch_ra_deg":196.260488,"epoch_dec_deg":27.939928,"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":"Coma Berenices","discovered":"1865","featured":false,"url":"https://spacecatalog.org/object/ngc-4943","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.46,"h_mag":11.62,"j_mag":12.36,"k_mag":11.4,"redshift":0.01877,"hubble_type":"S0","wikidata_id":"Q1115811","redshift_cmb":0.019670313672668138,"discovered_by":"Heinrich Louis d'Arrest","ngc_type_code":"G","uncertainties":{"distance_ly":[18095936.6685737,18095936.6685737]},"major_axis_arcmin":0.79,"minor_axis_arcmin":0.54,"position_angle_deg":105,"surface_brightness":23.64,"radial_velocity_km_s":5574},"designations":[{"catalog":"2MASX","designation":"2MASX J13034495+2805029"},{"catalog":"LEDA","designation":"LEDA 45129"},{"catalog":"NGC","designation":"NGC 4943"},{"catalog":"PGC","designation":"PGC 45129"},{"catalog":"SDSS","designation":"SDSS J130344.94+280503.1"},{"catalog":"SDSS","designation":"SDSS J130344.94+280503.2"},{"catalog":"SDSS","designation":"SDSS J130344.95+280503.1"}],"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."}