{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T03:54:31.488Z","years_from_j2000":26.679,"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-4872","name":"NGC 4872","class":"elliptical_galaxy_e_s0","category":"galaxy","object_type":"Elliptical galaxy E-S0","mag":13.59,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":353870595.9419768,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":194.89183333333332,"dec_deg":27.946944444444444,"epoch_ra_deg":195.216647,"epoch_dec_deg":27.801932,"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":"1785","featured":false,"url":"https://spacecatalog.org/object/ngc-4872","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.55,"h_mag":11.66,"j_mag":12.33,"k_mag":11,"v_mag":13.59,"redshift":0.02395,"hubble_type":"E-S0","wikidata_id":"Q1115139","redshift_cmb":0.02486578362955605,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[20150430.460486986,20150430.460486986]},"major_axis_arcmin":0.67,"minor_axis_arcmin":0.41,"wikipedia_article":"NGC 4872","position_angle_deg":124,"surface_brightness":22.41,"radial_velocity_km_s":7094},"designations":[{"catalog":"LEDA","designation":"LEDA 44624"},{"catalog":"MCG","designation":"MCG +05-31-068"},{"catalog":"NGC","designation":"NGC 4872"},{"catalog":"PGC","designation":"PGC 44624"},{"catalog":"SDSS","designation":"SDSS J125934.11+275648.5"},{"catalog":"SDSS","designation":"SDSS J125934.12+275648.4"},{"catalog":"SDSS","designation":"SDSS J125934.12+275648.6"},{"catalog":"SDSS","designation":"SDSS J125934.13+275648.5"}],"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."}