{"phys_par":[{"units":null,"sigma":"0.8","name":"M1","notes":"2 parameter fit from 1584 observations, autocmod 3.0g","title":"comet total magnitude","desc":"absolute magnitude of comet and coma (i.e. total)","value":"13.1","ref":"K252/9"},{"units":null,"sigma":null,"name":"K1","title":"comet total magnitude slope","notes":"autocmod 3.0g","desc":"comet total magnitude slope parameter","value":"4.75","ref":"K252/9"},{"ref":"Lamy,P.L.;Toth,I.;Fernandez,Y.R.;Weaver,H.A. (2004) Comets II, pp. 223-264","title":"diameter","notes":null,"value":"5.6","desc":"effective body diameter","name":"diameter","sigma":null,"units":"km"},{"units":"h","name":"rot_per","sigma":null,"ref":"LCDB (Rev. 2023-October); Warner et al., 2009","notes":"[Result based on less than full coverage, so that the period may be wrong by 30 percent or so.]  REFERENCE LIST:[Kokotankekova, R.; Snodgrass, C.; Lacerda, P.; Green S.F.; et al. (2017) Mon. Not. Royal Ast. Soc. 471, 2974-3007.]","value":"15.6","title":"rotation period","desc":"body rotation period (synodic)"}],"object":{"spkid":"1000003","neo":false,"orbit_class":{"code":"JFc","name":"Jupiter-family Comet"},"orbit_id":"K252/9","pha":false,"prefix":"P","kind":"cn","des":"47P","fullname":"47P/Ashbrook-Jackson"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"orbit":{"source":"JPL","moid":"1.8","orbit_id":"K252/9","data_arc":"4549","sb_used":"SB441-N16","moid_jup":"0.0122","not_valid_before":null,"epoch":"2459558.5","equinox":"J2000","model_pars":[{"desc":"non-gravitational radial acceleration parameter","title":"non-grav. radial accel.","value":"1.234e-07","n":1,"name":"A1","sigma":"7.762E-9","units":"au/d^2","kind":"EST"},{"n":2,"sigma":"4.163E-9","name":"A2","units":"au/d^2","kind":"EST","title":"non-grav. transverse accel.","desc":"non-gravitational transverse acceleration parameter","value":"5.158e-08"}],"first_obs":"2014-04-05","n_dop_obs_used":null,"n_obs_used":2403,"t_jup":"2.906","elements":[{"title":"eccentricity","value":"0.319","name":"e","sigma":"2.9e-07","label":"e","units":null},{"label":"a","units":"au","name":"a","sigma":"1.5e-07","title":"semi-major axis","value":"4.12"},{"sigma":"1.3e-06","name":"q","units":"au","label":"q","value":"2.81","title":"perihelion distance"},{"title":"inclination; angle with respect to x-y ecliptic plane","value":"13","sigma":"1.1e-05","name":"i","units":"deg","label":"i"},{"value":"357","title":"longitude of the ascending node","units":"deg","label":"node","name":"om","sigma":"2.2e-05"},{"title":"argument of perihelion","value":"358","name":"w","sigma":"3.3e-05","units":"deg","label":"peri"},{"units":"deg","label":"M","name":"ma","sigma":"1.3e-05","value":"193","title":"mean anomaly"},{"value":"2460975.170","title":"time of perihelion passage","sigma":"0.00014","name":"tp","units":"TDB","label":"tp"},{"label":"period","units":"d","name":"per","sigma":"0.00016","title":"sidereal orbital period","value":"3060"},{"value":"0.118","title":"mean motion","name":"n","sigma":"6.3e-09","label":"n","units":"deg/d"},{"title":"aphelion distance","value":"5.44","name":"ad","sigma":"1.9e-07","label":"Q","units":"au"}],"pe_used":"DE441","last_obs":"2026-09-18","cov_epoch":"2459558.5","rms":"0.67","not_valid_after":null,"two_body":null,"soln_date":"2026-09-21 09:56:28","condition_code":"0","comment":null,"producer":"Davide Farnocchia","n_del_obs_used":null}}