{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T21:07:26.631Z","years_from_j2000":26.654,"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-447","name":"NGC 447","class":"lenticular_galaxy_s0_a","category":"galaxy","object_type":"Lenticular galaxy S0-a","mag":13.94,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":250184695.15472168,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":18.906791666666667,"dec_deg":33.06772222222222,"epoch_ra_deg":19.281226,"epoch_dec_deg":33.209702,"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":"Pisces","discovered":"1861","featured":false,"url":"https://spacecatalog.org/object/ngc-447","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.07,"h_mag":9.79,"j_mag":10.52,"k_mag":9.48,"v_mag":13.94,"redshift":0.018653,"hubble_type":"S0-a","wikidata_id":"Q1036649","redshift_cmb":0.01767374619488904,"discovered_by":"Heinrich Louis d'Arrest","ngc_type_code":"G","uncertainties":{"distance_ly":[17385215.074318066,17385215.074318066]},"major_axis_arcmin":2.21,"minor_axis_arcmin":2.15,"wikipedia_article":"NGC 447","position_angle_deg":15,"surface_brightness":25.53,"radial_velocity_km_s":5540},"designations":[{"catalog":"2MASX","designation":"2MASX J01153760+3304035"},{"catalog":"IC","designation":"IC 1656"},{"catalog":"IRAS","designation":"IRAS F01128+3248"},{"catalog":"LEDA","designation":"LEDA 4550"},{"catalog":"MCG","designation":"MCG +05-04-006"},{"catalog":"NGC","designation":"NGC 447"},{"catalog":"PGC","designation":"PGC 4550"},{"catalog":"UGC","designation":"UGC 804"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}