{"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":"2026-08-27T17:05:59.821Z","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-7331","name":"NGC 7331","class":"spiral_galaxy_sbc","category":"galaxy","object_type":"Spiral galaxy Sbc","mag":9.41,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":23022482.38746373,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":339.2667083333333,"dec_deg":34.415527777777775,"epoch_ra_deg":339.573081,"epoch_dec_deg":34.554622,"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":"Pegasus","discovered":"1784","featured":false,"url":"https://spacecatalog.org/object/ngc-7331","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":10.2,"h_mag":6.29,"j_mag":7.06,"k_mag":6.03,"v_mag":9.41,"redshift":0.002732,"hubble_type":"Sbc","wikidata_id":"Q671450","redshift_cmb":0.0016461084523824443,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14026385.848352918,14026385.848352918]},"major_axis_arcmin":9.27,"minor_axis_arcmin":3.76,"wikipedia_article":"NGC 7331","position_angle_deg":170,"surface_brightness":23.08,"radial_velocity_km_s":818},"designations":[{"catalog":"2MASX","designation":"2MASX J22370410+3424573"},{"catalog":"Caldwell","designation":"C 30"},{"catalog":"IRAS","designation":"IRAS 22347+3409"},{"catalog":"IRAS","designation":"IRAS F22347+3409"},{"catalog":"LEDA","designation":"LEDA 69327"},{"catalog":"MCG","designation":"MCG +06-49-045"},{"catalog":"NGC","designation":"NGC 7331"},{"catalog":"PGC","designation":"PGC 69327"},{"catalog":"SDSS","designation":"SDSS J223704.05+342456.8"},{"catalog":"UGC","designation":"UGC 12113"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T16:03:54.983Z","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."}