{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T03:27:08.984Z","years_from_j2000":26.671,"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-2247","name":"NGC 2247","class":"reflection_nebula","category":"nebula","object_type":"Reflection nebula","mag":8.5,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":98.27166666666666,"dec_deg":10.32225,"epoch_ra_deg":98.642666,"epoch_dec_deg":10.30254,"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":"Monoceros","discovered":"1857","featured":false,"url":"https://spacecatalog.org/object/ngc-2247","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":8.5,"wikidata_id":"Q1047690","discovered_by":"William Parsons, 3rd Earl of Rosse","ngc_type_code":"RfN","major_axis_arcmin":2,"minor_axis_arcmin":2},"designations":[{"catalog":"BD","designation":"BD +10 1172"},{"catalog":"Cederblad","designation":"Ced 81"},{"catalog":"HIP","designation":"HIP 31235"},{"catalog":"IRAS","designation":"IRAS 06303+1021"},{"catalog":"LBN","designation":"LBN 901"},{"catalog":"Lynds","designation":"LBN 201.63+00.64"},{"catalog":"NGC","designation":"NGC 2247"}],"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."}