{"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"object":{"kind":"cn","pha":false,"des":"36P","orbit_class":{"code":"JFc","name":"Jupiter-family Comet"},"prefix":"P","orbit_id":"25","spkid":"1000105","neo":false,"fullname":"36P/Whipple"},"orbit":{"not_valid_after":null,"moid":"2.1","soln_date":"2026-06-18 16:23:53","sb_used":"SB441-N16","not_valid_before":null,"epoch":"2454686.5","last_obs":"2022-03-06","n_obs_used":949,"t_jup":"2.952","equinox":"J2000","data_arc":"26894","rms":"0.64","two_body":null,"moid_jup":"0.26","model_pars":[{"n":1,"desc":"non-gravitational radial acceleration parameter","sigma":"9.583E-10","units":"au/d^2","title":"non-grav. radial accel.","kind":"EST","name":"A1","value":"5.296e-09"},{"kind":"EST","name":"A2","value":"-5.435e-10","n":2,"desc":"non-gravitational transverse acceleration parameter","sigma":"3.326E-11","units":"au/d^2","title":"non-grav. transverse accel."}],"orbit_id":"25","pe_used":"DE441","elements":[{"sigma":"8.3e-08","title":"eccentricity","units":null,"label":"e","value":"0.258","name":"e"},{"sigma":"3.9e-08","title":"semi-major axis","units":"au","name":"a","value":"4.16","label":"a"},{"title":"perihelion distance","sigma":"3.4e-07","units":"au","label":"q","name":"q","value":"3.09"},{"sigma":"1e-05","title":"inclination; angle with respect to x-y ecliptic plane","units":"deg","value":"9.94","name":"i","label":"i"},{"value":"182","name":"om","label":"node","sigma":"5e-05","title":"longitude of the ascending node","units":"deg"},{"label":"peri","value":"202","name":"w","title":"argument of perihelion","sigma":"5.7e-05","units":"deg"},{"units":"deg","sigma":"1.9e-05","title":"mean anomaly","name":"ma","value":"216","label":"M"},{"sigma":"0.00015","title":"time of perihelion passage","units":"TDB","value":"2455927.995","name":"tp","label":"tp"},{"title":"sidereal orbital period","sigma":"4.4e-05","units":"d","value":"3100","name":"per","label":"period"},{"name":"n","value":"0.116","label":"n","sigma":"1.6e-09","title":"mean motion","units":"deg/d"},{"label":"Q","value":"5.24","name":"ad","sigma":"5e-08","title":"aphelion distance","units":"au"}],"first_obs":"1948-07-18","n_del_obs_used":null,"source":"JPL","cov_epoch":"2454686.5","producer":"Davide Farnocchia","n_dop_obs_used":null,"condition_code":"0","comment":null},"phys_par":[{"notes":"2 parameter fit from 591 observations, autocmod 3.0g","name":"M1","value":"10.7","ref":"25","units":null,"sigma":"0.6","desc":"absolute magnitude of comet and coma (i.e. total)","title":"comet total magnitude"},{"notes":"autocmod 3.0g","name":"K1","value":"13.","ref":"25","units":null,"sigma":null,"desc":"comet total magnitude slope parameter","title":"comet total magnitude slope"},{"notes":"from 202 observations, autocmod 3.0g","value":"14.5","name":"M2","ref":"25","desc":"absolute magnitude of comet nucleus","sigma":"0.8","units":null,"title":"comet nuclear magnitude"},{"name":"K2","value":"5.","notes":"autocmod 3.0g","desc":"comet nuclear magnitude slope parameter","sigma":null,"units":null,"title":"comet nuclear magnitude slope","ref":"25"},{"name":"PC","value":"0.03","notes":"autocmod 3.0g","title":"comet nuclear phase coefficient","sigma":null,"units":null,"desc":"comet nuclear magnitude law phase coefficient","ref":"25"},{"ref":"Lamy,P.L,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (To be published)","title":"diameter","sigma":null,"units":"km","desc":"effective body diameter","notes":null,"name":"diameter","value":"4.56"}]}