{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T17:58:22.366Z","years_from_j2000":26.673,"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-2237","name":"Rosette A","class":"nebula","category":"nebula","object_type":"Nebula","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":97.72754166666667,"dec_deg":5.049166666666666,"epoch_ra_deg":98.08469,"epoch_dec_deg":5.030876,"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":null,"featured":true,"url":"https://spacecatalog.org/object/ngc-2237","radius_km":null,"radius_kind":null,"data_quality":null,"description":"A ring of glowing hydrogen several dozen light-years across, hollowed out from within by the winds of the young cluster at its centre.","properties":{"redshift":0.000125,"wikidata_id":"Q18088385","ngc_type_code":"Neb","major_axis_arcmin":80,"minor_axis_arcmin":50,"wikipedia_article":"NGC 2237","radial_velocity_km_s":38},"designations":[{"catalog":"Common name","designation":"Rosette A"},{"catalog":"IAU cluster","designation":"C 0627+050"},{"catalog":"NGC","designation":"NGC 2237"}],"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."}