{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T01:38:25.000Z","years_from_j2000":26.674,"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-823","name":"NGC 823","class":"elliptical_galaxy_e_s0","category":"galaxy","object_type":"Elliptical galaxy E-S0","mag":13.72,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":197786019.76467702,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":31.833541666666665,"dec_deg":-25.44188888888889,"epoch_ra_deg":32.140973,"epoch_dec_deg":-25.313873,"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":"Fornax","discovered":"1830","featured":false,"url":"https://spacecatalog.org/object/ngc-823","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.72,"h_mag":10.09,"j_mag":10.8,"k_mag":9.94,"redshift":0.014754,"hubble_type":"E-S0","wikidata_id":"Q1039480","redshift_cmb":0.0140103746618645,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[16219035.395698305,16219035.395698305]},"major_axis_arcmin":1.54,"minor_axis_arcmin":1.1,"wikipedia_article":"NGC 823","position_angle_deg":107,"surface_brightness":23.38,"radial_velocity_km_s":4391},"designations":[{"catalog":"2MASX","designation":"2MASX J02072004-2526305"},{"catalog":"ESO","designation":"ESO 478-002"},{"catalog":"ESO","designation":"ESO 478-2"},{"catalog":"ESO-LV","designation":"ESO-LV 478-0020"},{"catalog":"IC","designation":"IC 1782"},{"catalog":"IRAS","designation":"IRAS 02050-2540"},{"catalog":"IRAS","designation":"IRAS F02050-2540"},{"catalog":"LEDA","designation":"LEDA 8093"},{"catalog":"MCG","designation":"MCG -04-06-005"},{"catalog":"NGC","designation":"NGC 823"},{"catalog":"PGC","designation":"PGC 8093"}],"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."}