{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T07:11:25.139Z","years_from_j2000":26.666,"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-830","name":"NGC 830","class":"elliptical_galaxy_e_s0","category":"galaxy","object_type":"Elliptical galaxy E-S0","mag":14.35,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":169163797.1274499,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":32.2445,"dec_deg":-7.766805555555555,"epoch_ra_deg":32.577909,"epoch_dec_deg":-7.639386,"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":"Cetus","discovered":"1865","featured":false,"url":"https://spacecatalog.org/object/ngc-830","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.35,"h_mag":10.11,"j_mag":10.76,"k_mag":9.87,"redshift":0.01286,"hubble_type":"E-S0","wikidata_id":"Q1039554","redshift_cmb":0.012000933955167437,"discovered_by":"Heinrich Louis d'Arrest","ngc_type_code":"G","uncertainties":{"distance_ly":[15665626.485473959,15665626.485473959]},"major_axis_arcmin":1.4,"minor_axis_arcmin":0.82,"wikipedia_article":"NGC 830","position_angle_deg":76,"surface_brightness":23.61,"radial_velocity_km_s":3831},"designations":[{"catalog":"2MASX","designation":"2MASX J02085867-0746010"},{"catalog":"LEDA","designation":"LEDA 8201"},{"catalog":"MCG","designation":"MCG -01-06-050"},{"catalog":"NGC","designation":"NGC 830"},{"catalog":"PGC","designation":"PGC 8201"},{"catalog":"SDSS","designation":"SDSS J020858.68-074600.5"}],"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."}