{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T14:50:15.014Z","years_from_j2000":26.681,"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-7009","name":"Saturn Nebula","class":"planetary_nebula","category":"nebula","object_type":"Planetary nebula","mag":8,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":4321.57200474685,"distance_method":"Statistical distance scale for planetary nebulae (Stanghellini+ 2008)","ra_deg":316.04495833333334,"dec_deg":-11.363249999999999,"epoch_ra_deg":316.410195,"epoch_dec_deg":-11.256839,"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":"Aquarius","discovered":"1782","featured":false,"url":"https://spacecatalog.org/object/ngc-7009","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":8.3,"h_mag":9.46,"j_mag":9.33,"k_mag":8.75,"v_mag":8,"redshift":-0.000155,"wikidata_id":"Q15831","discovered_by":"William Herschel","ngc_type_code":"PN","major_axis_arcmin":0.7,"minor_axis_arcmin":0.52,"wikipedia_article":"Saturn Nebula","distance_reference":"NGC 7009","position_angle_deg":70,"radial_velocity_km_s":-47},"designations":[{"catalog":"2MASX","designation":"2MASX J21041082-1121481"},{"catalog":"Caldwell","designation":"C 55"},{"catalog":"Common name","designation":"Saturn Nebula"},{"catalog":"HD","designation":"HD 200516"},{"catalog":"HIP","designation":"HIP 103992"},{"catalog":"IRAS","designation":"IRAS 21014-1133"},{"catalog":"IRAS","designation":"IRAS F21014-1133"},{"catalog":"NGC","designation":"NGC 7009"},{"catalog":"PN","designation":"PN G037.7-34.5"}],"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."}