{"discovery":{"ref":"comet.dis","citation":null,"who":"Holmes, Edwin","cref":null,"location":"London, England","discovery":"Discovered 1892-11-07 by Holmes, Edwin at London, England","name":null,"date":"1892-Nov-07","site":null},"object":{"kind":"cn","spkid":"1000044","neo":false,"des":"17P","pha":false,"orbit_id":"K212/34","fullname":"17P/Holmes","orbit_class":{"code":"JFc","name":"Jupiter-family Comet"},"prefix":"P"},"orbit":{"comment":null,"moid":"1.07","orbit_id":"K212/34","n_obs_used":2211,"t_jup":"2.859","n_dop_obs_used":null,"cov_epoch":"2457680.5","equinox":"J2000","sb_used":"SB441-N16","soln_date":"2023-10-10 13:05:23","pe_used":"DE441","last_obs":"2023-01-22","rms":"0.61","producer":"Davide Farnocchia","not_valid_after":null,"two_body":null,"source":"JPL","data_arc":"4401","not_valid_before":null,"model_pars":[{"n":1,"name":"A1","value":"2.937e-09","units":"au/d^2","desc":"non-gravitational radial acceleration parameter","sigma":"2.174E-10","kind":"EST","title":"non-grav. radial accel."},{"value":"9.77e-10","name":"A2","n":2,"units":"au/d^2","desc":"non-gravitational transverse acceleration parameter","sigma":"9.23E-11","title":"non-grav. transverse accel.","kind":"EST"}],"epoch":"2457680.5","condition_code":"0","n_del_obs_used":null,"elements":[{"units":null,"title":"eccentricity","label":"e","name":"e","sigma":"1.1e-07","value":"0.43"},{"title":"semi-major axis","units":"au","value":"3.63","sigma":"1.4e-07","name":"a","label":"a"},{"units":"au","title":"perihelion distance","label":"q","name":"q","sigma":"4.5e-07","value":"2.07"},{"title":"inclination; angle with respect to x-y ecliptic plane","units":"deg","value":"19.1","sigma":"6.7e-06","name":"i","label":"i"},{"units":"deg","title":"longitude of the ascending node","label":"node","name":"om","sigma":"4.5e-05","value":"327"},{"label":"peri","name":"w","sigma":"5.9e-05","value":"24.7","units":"deg","title":"argument of perihelion"},{"name":"ma","label":"M","value":"134","sigma":"2.2e-05","units":"deg","title":"mean anomaly"},{"title":"time of perihelion passage","units":"TDB","sigma":"0.00017","value":"2456743.220","label":"tp","name":"tp"},{"sigma":"0.00015","value":"2520","label":"period","name":"per","title":"sidereal orbital period","units":"d"},{"units":"deg/d","title":"mean motion","name":"n","label":"n","value":"0.143","sigma":"8.5e-09"},{"title":"aphelion distance","units":"au","sigma":"2.1e-07","value":"5.19","label":"Q","name":"ad"}],"first_obs":"2011-01-04","moid_jup":"0.481"},"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"}}