{"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":"2026-09-02T14:23:20.239Z","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-4889","name":"NGC 4889","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":11.45,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":318373995.257656,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":195.033875,"dec_deg":27.976999999999997,"epoch_ra_deg":195.358318,"epoch_dec_deg":27.832148,"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-4889","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.49,"h_mag":8.71,"j_mag":9.4,"k_mag":8.41,"v_mag":11.45,"redshift":0.0215,"hubble_type":"E","wikidata_id":"Q754715","redshift_cmb":0.022412003397962232,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[19146289.626330476,19146289.626330476]},"major_axis_arcmin":2.59,"minor_axis_arcmin":1.68,"wikipedia_article":"NGC 4889","position_angle_deg":80,"surface_brightness":23.39,"radial_velocity_km_s":6376},"designations":[{"catalog":"2MASX","designation":"2MASX J13000809+2758372"},{"catalog":"Caldwell","designation":"C 35"},{"catalog":"LEDA","designation":"LEDA 44715"},{"catalog":"MCG","designation":"MCG +05-31-077"},{"catalog":"NGC","designation":"NGC 4884"},{"catalog":"NGC","designation":"NGC 4889"},{"catalog":"PGC","designation":"PGC 44715"},{"catalog":"SDSS","designation":"SDSS J130008.12+275837.0"},{"catalog":"SDSS","designation":"SDSS J130008.13+275836.9"},{"catalog":"SDSS","designation":"SDSS J130008.13+275837.2"},{"catalog":"SDSS","designation":"SDSS J130008.14+275837.2"},{"catalog":"UGC","designation":"UGC 8110"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}