{"discovery":{"name":null,"citation":null,"discovery":"Discovered 1965-01-11 by  at Purple Mountain Observatory, Nanking","site":null,"date":"1965-Jan-11","ref":"comet.dis","location":"Purple Mountain Observatory, Nanking","cref":null,"who":""},"object":{"orbit_id":"K253/1","des":"60P","kind":"cn","fullname":"60P/Tsuchinshan 2","orbit_class":{"code":"JFc","name":"Jupiter-family Comet"},"neo":false,"pha":false,"spkid":"1000098","prefix":"P"},"orbit":{"source":"JPL","epoch":"2458393.5","pe_used":"DE441","not_valid_before":null,"condition_code":"0","t_jup":"2.864","sb_used":"SB441-N16","n_dop_obs_used":null,"not_valid_after":null,"comment":null,"elements":[{"label":"e","value":"0.538","sigma":"1.5e-07","title":"eccentricity","name":"e","units":null},{"sigma":"1.2e-07","label":"a","value":"3.51","units":"au","name":"a","title":"semi-major axis"},{"title":"perihelion distance","name":"q","units":"au","value":"1.62","label":"q","sigma":"5e-07"},{"name":"i","title":"inclination; angle with respect to x-y ecliptic plane","units":"deg","sigma":"6.1e-06","value":"3.61","label":"i"},{"units":"deg","title":"longitude of the ascending node","name":"om","label":"node","value":"268","sigma":"0.00018"},{"sigma":"0.00019","value":"217","label":"peri","name":"w","title":"argument of perihelion","units":"deg"},{"sigma":"1.6e-05","label":"M","value":"349","units":"deg","name":"ma","title":"mean anomaly"},{"value":"2458463.732","label":"tp","sigma":"0.00011","title":"time of perihelion passage","name":"tp","units":"TDB"},{"units":"d","name":"per","title":"sidereal orbital period","sigma":"0.00012","label":"period","value":"2400"},{"sigma":"7.5e-09","label":"n","value":"0.15","units":"deg/d","name":"n","title":"mean motion"},{"units":"au","name":"ad","title":"aphelion distance","sigma":"1.8e-07","value":"5.4","label":"Q"}],"last_obs":"2025-02-23","producer":"Davide Farnocchia","rms":"0.6","first_obs":"2011-10-29","two_body":null,"data_arc":"4866","model_pars":[{"title":"non-grav. transverse accel.","units":"au/d^2","value":"-5.802e-11","kind":"EST","name":"A2","desc":"non-gravitational transverse acceleration parameter","n":1,"sigma":"6.759E-12"}],"cov_epoch":"2458393.5","moid_jup":"0.128","n_obs_used":1247,"equinox":"J2000","moid":"0.64","n_del_obs_used":null,"orbit_id":"K253/1","soln_date":"2025-02-28 14:18:31"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"}}
