{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T09:08:58.863Z","years_from_j2000":26.675,"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-6403","name":"NGC 6403","class":"lenticular_galaxy_s0","category":"galaxy","object_type":"Lenticular galaxy S0","mag":14.34,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":265.84816666666666,"dec_deg":-61.68211111111111,"epoch_ra_deg":266.468882,"epoch_dec_deg":-61.694413,"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":"Pavo","discovered":"1834","featured":false,"url":"https://spacecatalog.org/object/ngc-6403","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.34,"h_mag":10.31,"j_mag":10.92,"k_mag":9.98,"hubble_type":"S0","wikidata_id":"Q1145568","discovered_by":"John Frederick William Herschel","ngc_type_code":"G","major_axis_arcmin":1.15,"minor_axis_arcmin":0.89,"position_angle_deg":19,"surface_brightness":23.38},"designations":[{"catalog":"2MASX","designation":"2MASX J17432300-6141175"},{"catalog":"2MASX","designation":"2MASX J17432356-6140555"},{"catalog":"ESO","designation":"ESO 139-019"},{"catalog":"ESO","designation":"ESO 139-19"},{"catalog":"ESO-LV","designation":"ESO-LV 139-0190"},{"catalog":"LEDA","designation":"LEDA 60750"},{"catalog":"NGC","designation":"NGC 6403"},{"catalog":"PGC","designation":"PGC 60750"}],"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."}