{"object":{"kind":"cn","prefix":"P","pha":false,"orbit_class":{"code":"JFc","name":"Jupiter-family Comet"},"fullname":"78P/Gehrels 2","orbit_id":"K263/38","spkid":"1000030","des":"78P","neo":false},"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"phys_par":[{"value":"9.1","notes":"2 parameter fit from 2600 observations, autocmod 3.0g","units":null,"name":"M1","desc":"absolute magnitude of comet and coma (i.e. total)","ref":"K263/38","sigma":"0.7","title":"comet total magnitude"},{"ref":"K263/38","sigma":null,"title":"comet total magnitude slope","notes":"autocmod 3.0g","value":"13.25","name":"K1","units":null,"desc":"comet total magnitude slope parameter"},{"ref":"K263/38","sigma":"0.7","title":"comet nuclear magnitude","value":"12.5","notes":"from 3352 observations, autocmod 3.0g","units":null,"name":"M2","desc":"absolute magnitude of comet nucleus"},{"notes":"autocmod 3.0g","value":"5.","name":"K2","units":null,"desc":"comet nuclear magnitude slope parameter","sigma":null,"ref":"K263/38","title":"comet nuclear magnitude slope"},{"sigma":null,"ref":"K263/38","title":"comet nuclear phase coefficient","value":"0.03","notes":"autocmod 3.0g","desc":"comet nuclear magnitude law phase coefficient","name":"PC","units":null}],"orbit":{"last_obs":"2026-10-14","source":"JPL","orbit_id":"K263/38","two_body":null,"n_del_obs_used":null,"equinox":"J2000","elements":[{"units":null,"name":"e","title":"eccentricity","label":"e","value":"0.461","sigma":"5e-08"},{"label":"a","title":"semi-major axis","name":"a","units":"au","value":"3.74","sigma":"3.5e-08"},{"title":"perihelion distance","label":"q","units":"au","name":"q","sigma":"1.9e-07","value":"2.01"},{"units":"deg","name":"i","title":"inclination; angle with respect to x-y ecliptic plane","label":"i","sigma":"4.6e-06","value":"6.25"},{"name":"om","units":"deg","label":"node","title":"longitude of the ascending node","sigma":"3.8e-05","value":"211"},{"units":"deg","name":"w","title":"argument of perihelion","label":"peri","sigma":"4.7e-05","value":"193"},{"title":"mean anomaly","label":"M","units":"deg","name":"ma","sigma":"1.3e-05","value":"228"},{"name":"tp","units":"TDB","label":"tp","title":"time of perihelion passage","sigma":"0.0001","value":"2458576.603"},{"label":"period","title":"sidereal orbital period","units":"d","name":"per","sigma":"3.7e-05","value":"2640"},{"name":"n","units":"deg/d","label":"n","title":"mean motion","sigma":"1.9e-09","value":"0.136"},{"title":"aphelion distance","label":"Q","name":"ad","units":"au","value":"5.46","sigma":"5.1e-08"}],"first_obs":"2011-05-03","moid":"1.02","rms":"0.6","n_dop_obs_used":null,"soln_date":"2026-10-14 21:05:19","not_valid_before":null,"epoch":"2457611.5","producer":"Shantanu Naidu","t_jup":"2.887","condition_code":"0","sb_used":"SB441-N16","data_arc":"5643","cov_epoch":"2457611.5","not_valid_after":null,"model_pars":[{"value":"-1.933e-09","kind":"EST","desc":"non-gravitational radial acceleration parameter","name":"A1","units":"au/d^2","n":1,"sigma":"1.045E-10","title":"non-grav. radial accel."},{"value":"-9.739e-10","kind":"EST","n":2,"desc":"non-gravitational transverse acceleration parameter","name":"A2","units":"au/d^2","sigma":"2.224E-12","title":"non-grav. transverse accel."}],"pe_used":"DE441","moid_jup":"0.0258","n_obs_used":6376,"comment":null}}
