{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T16:51:43.212Z","years_from_j2000":26.667,"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-417","name":"NGC 417","class":"elliptical_galaxy_e_s0","category":"galaxy","object_type":"Elliptical galaxy E-S0","mag":15.29,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":609730455.1737102,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":17.773166666666665,"dec_deg":-18.148333333333333,"epoch_ra_deg":18.102848,"epoch_dec_deg":-18.005423,"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":"1886","featured":false,"url":"https://spacecatalog.org/object/ngc-417","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.29,"h_mag":11.08,"j_mag":11.9,"k_mag":10.92,"redshift":0.04331,"hubble_type":"E-S0","wikidata_id":"Q1036508","redshift_cmb":0.04230531463808007,"discovered_by":"Francis Preserved Leavenworth","ngc_type_code":"G","uncertainties":{"distance_ly":[28484614.896512203,28484614.896512203]},"major_axis_arcmin":1.08,"minor_axis_arcmin":0.81,"wikipedia_article":"NGC 417","position_angle_deg":24,"surface_brightness":24.15,"radial_velocity_km_s":12703},"designations":[{"catalog":"2MASX","designation":"2MASX J01110557-1808534"},{"catalog":"ESO","designation":"ESO 541-024"},{"catalog":"ESO","designation":"ESO 541-24"},{"catalog":"ESO-LV","designation":"ESO-LV 541-0240"},{"catalog":"LEDA","designation":"LEDA 4237"},{"catalog":"MCG","designation":"MCG -03-04-019"},{"catalog":"NGC","designation":"NGC 417"},{"catalog":"PGC","designation":"PGC 4237"}],"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."}