{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T23:08:47.400Z","years_from_j2000":26.665,"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-72","name":"NGC 72","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy Sab","mag":13.56,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":312637761.6539576,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":4.6182083333333335,"dec_deg":30.040694444444448,"epoch_ra_deg":4.968085,"epoch_dec_deg":30.189823,"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":"Andromeda","discovered":"1855","featured":false,"url":"https://spacecatalog.org/object/ngc-72","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.6,"h_mag":10.7,"j_mag":11.4,"k_mag":10.35,"v_mag":13.56,"redshift":0.02313,"hubble_type":"Sab","wikidata_id":"Q756878","redshift_cmb":0.022014659799817426,"discovered_by":"William Parsons, 3rd Earl of Rosse","ngc_type_code":"G","uncertainties":{"distance_ly":[18989138.852095038,18989138.852095038]},"major_axis_arcmin":1.16,"minor_axis_arcmin":1.06,"wikipedia_article":"NGC 72","position_angle_deg":85,"surface_brightness":23.61,"radial_velocity_km_s":6855},"designations":[{"catalog":"2MASX","designation":"2MASX J00182837+3002265"},{"catalog":"LEDA","designation":"LEDA 1204"},{"catalog":"MCG","designation":"MCG +05-01-069"},{"catalog":"NGC","designation":"NGC 72"},{"catalog":"PGC","designation":"PGC 1204"},{"catalog":"UGC","designation":"UGC 176"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}