{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T08:52:50.950Z","years_from_j2000":26.669,"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-666","name":"NGC 666","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":13.37,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":212139535.9597406,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":26.52583333333333,"dec_deg":34.37452777777778,"epoch_ra_deg":26.914517,"epoch_dec_deg":34.509075,"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":"Triangulum","discovered":"1883","featured":false,"url":"https://spacecatalog.org/object/ngc-666","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.26,"h_mag":10.62,"j_mag":11.26,"k_mag":10.37,"v_mag":13.37,"redshift":0.015904,"hubble_type":"E","wikidata_id":"Q1038087","redshift_cmb":0.01501583667068096,"discovered_by":"Édouard Stephan","ngc_type_code":"G","uncertainties":{"distance_ly":[16519876.758816818,16519876.758816818]},"major_axis_arcmin":0.77,"minor_axis_arcmin":0.52,"position_angle_deg":81,"surface_brightness":22.55,"radial_velocity_km_s":4730},"designations":[{"catalog":"2MASX","designation":"2MASX J01460620+3422283"},{"catalog":"LEDA","designation":"LEDA 6483"},{"catalog":"MCG","designation":"MCG +06-05-002"},{"catalog":"NGC","designation":"NGC 666"},{"catalog":"PGC","designation":"PGC 6483"},{"catalog":"UGC","designation":"UGC 1236"}],"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."}