{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T22:53:00.440Z","years_from_j2000":26.684,"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-6651","name":"NGC 6651","class":"spiral_galaxy_sbc","category":"galaxy","object_type":"Spiral galaxy Sbc","mag":13.63,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":268693861.211882,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":276.08212499999996,"dec_deg":71.60191666666667,"epoch_ra_deg":275.978255,"epoch_dec_deg":71.615338,"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":"Draco","discovered":"1884","featured":false,"url":"https://spacecatalog.org/object/ngc-6651","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.63,"h_mag":10.58,"j_mag":11.26,"k_mag":10.25,"redshift":0.01923,"hubble_type":"Sbc","wikidata_id":"Q1146896","redshift_cmb":0.018963112976563723,"discovered_by":"Lewis A. Swift","ngc_type_code":"G","uncertainties":{"distance_ly":[17838643.38030649,17838643.38030649]},"major_axis_arcmin":1.34,"minor_axis_arcmin":0.71,"position_angle_deg":32,"surface_brightness":22.75,"radial_velocity_km_s":5710},"designations":[{"catalog":"2MASX","designation":"2MASX J18241969+7136067"},{"catalog":"IRAS","designation":"IRAS 18250+7134"},{"catalog":"IRAS","designation":"IRAS F18251+7134"},{"catalog":"LEDA","designation":"LEDA 61836"},{"catalog":"MCG","designation":"MCG +12-17-022"},{"catalog":"NGC","designation":"NGC 6651"},{"catalog":"PGC","designation":"PGC 61836"},{"catalog":"UGC","designation":"UGC 11236"}],"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."}