{"orbit":{"soln_date":"2026-01-08 08:23:21","epoch":"2458545.5","source":"JPL","last_obs":"2025-12-27","comment":"Nongrav. accels. using CO driven g(r)","not_valid_after":null,"first_obs":"2013-01-17","cov_epoch":"2458545.5","rms":"0.68","n_del_obs_used":null,"elements":[{"value":"0.549","name":"e","units":null,"title":"eccentricity","label":"e","sigma":"8.2e-08"},{"title":"semi-major axis","label":"a","name":"a","value":"3.44","units":"au","sigma":"8.8e-08"},{"sigma":"2.5e-07","value":"1.55","name":"q","units":"au","label":"q","title":"perihelion distance"},{"value":"4.74","name":"i","units":"deg","title":"inclination; angle with respect to x-y ecliptic plane","label":"i","sigma":"5.6e-06"},{"sigma":"0.00015","value":"121","name":"om","units":"deg","title":"longitude of the ascending node","label":"node"},{"name":"w","units":"deg","value":"163","title":"argument of perihelion","label":"peri","sigma":"0.00015"},{"title":"mean anomaly","label":"M","name":"ma","units":"deg","value":"189","sigma":"1.1e-05"},{"sigma":"9.2e-05","name":"tp","units":"TDB","value":"2459656.388","label":"tp","title":"time of perihelion passage"},{"sigma":"9e-05","title":"sidereal orbital period","label":"period","value":"2330","name":"per","units":"d"},{"name":"n","units":"deg/d","value":"0.154","label":"n","title":"mean motion","sigma":"5.9e-09"},{"title":"aphelion distance","label":"Q","units":"au","name":"ad","value":"5.33","sigma":"1.4e-07"}],"producer":"Davide Farnocchia","n_obs_used":2690,"two_body":null,"t_jup":"2.866","pe_used":"DE441","n_dop_obs_used":null,"moid":"0.538","not_valid_before":null,"equinox":"J2000","sb_used":"SB441-N16","model_pars":[{"title":"non-grav. transverse accel.","value":"-1.13e-10","name":"A2","n":1,"sigma":"8.912E-12","units":"au/d^2","desc":"non-gravitational transverse acceleration parameter","kind":"EST"},{"kind":"SET","units":null,"desc":"normalizing factor [default 0.1112620426]","sigma":null,"n":0,"value":".0408373333128795","name":"ALN","title":"normalizing factor"},{"title":"non-grav. model exp. k","value":"2.6","name":"NK","n":0,"sigma":null,"desc":"non-grav. model constant, exponent k [default 4.6142]","units":null,"kind":"SET"},{"value":"2.","name":"NM","title":"non-grav. model exp. m","sigma":null,"n":0,"units":null,"desc":"non-grav. model constant, exponent m [default 2.15]","kind":"SET"},{"kind":"SET","units":null,"desc":"non-grav. model constant, exponent n [default 5.093]","n":0,"sigma":null,"title":"non-grav. model exp. n","value":"3.","name":"NN"},{"desc":"normalizing distance, au [default 2.808 au]","units":"au","kind":"SET","name":"R0","value":"5.","title":"normalizing distance","sigma":null,"n":0}],"data_arc":"4727","moid_jup":"0.0797","orbit_id":"K283/2","condition_code":"0"},"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"object":{"kind":"cn","fullname":"22P/Kopff","prefix":"P","spkid":"1000054","neo":false,"orbit_class":{"code":"JFc","name":"Jupiter-family Comet"},"pha":false,"des":"22P","orbit_id":"K283/2"},"phys_par":[{"sigma":"0.9","name":"M1","notes":"2 parameter fit from 1469 observations, autocmod 3.0g","value":"11.9","title":"comet total magnitude","ref":"K283/2","desc":"absolute magnitude of comet and coma (i.e. total)","units":null},{"sigma":null,"value":"9.75","notes":"autocmod 3.0g","name":"K1","title":"comet total magnitude slope","units":null,"ref":"K283/2","desc":"comet total magnitude slope parameter"},{"units":"km","ref":"Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)","desc":"effective body diameter","sigma":"0.4","name":"diameter","notes":null,"value":"3.0","title":"diameter"},{"sigma":"0.01","notes":null,"value":"0.05","name":"albedo","title":"geometric albedo","desc":"geometric albedo","ref":null,"units":null}]}
