{"object":{"orbit_id":"K284/2","fullname":"9P/Tempel 1","orbit_class":{"name":"Jupiter-family Comet","code":"JFc"},"neo":false,"spkid":"1000093","des":"9P","pha":false,"kind":"cn","prefix":"P"},"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"phys_par":[{"desc":"absolute magnitude of comet and coma (i.e. total)","units":null,"name":"M1","value":"12.9","notes":"2 parameter fit from 1223 observations, autocmod 3.0g","title":"comet total magnitude","ref":"K284/2","sigma":"0.7"},{"notes":"autocmod 3.0g","value":"9.","desc":"comet total magnitude slope parameter","units":null,"name":"K1","ref":"K284/2","sigma":null,"title":"comet total magnitude slope"},{"notes":null,"value":"6.0","units":"km","name":"diameter","desc":"effective body diameter","sigma":"0.2","ref":"A'Hearn, M.F. et al. (2005) Science 310:258-264","title":"diameter"},{"notes":"preliminary shape model","value":"7.6x4.9","name":"extent","units":"km","desc":"tri(or bi)-axial body dimensions","sigma":null,"ref":"A'Hearn, M.F. et al. (2005) Science 310:258-264","title":"extent"},{"sigma":null,"ref":"A'Hearn, M.F. et al. (2005) Science 310:258-264","title":"rotation period","value":"40.7","notes":null,"desc":"body rotation period (synodic)","name":"rot_per","units":"h"},{"title":"geometric albedo","ref":"Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)","sigma":"0.02","name":"albedo","units":null,"desc":"geometric albedo","value":"0.05","notes":null}],"orbit":{"t_jup":"2.970","condition_code":"0","sb_used":"SB441-N16","model_pars":[{"sigma":"2.17E-11","title":"non-grav. radial accel.","kind":"EST","value":"1.8e-11","n":1,"name":"A1","units":"au/d^2","desc":"non-gravitational radial acceleration parameter"},{"title":"non-grav. transverse accel.","sigma":"1.173E-12","n":2,"name":"A2","units":"au/d^2","desc":"non-gravitational transverse acceleration parameter","value":"1.179e-11","kind":"EST"}],"pe_used":"DE441","data_arc":"6267","not_valid_after":null,"cov_epoch":"2457470.5","comment":null,"n_obs_used":3283,"moid_jup":"0.296","source":"JPL","last_obs":"2025-12-22","orbit_id":"K284/2","n_del_obs_used":null,"elements":[{"units":null,"name":"e","title":"eccentricity","label":"e","value":"0.51","sigma":"4.6e-08"},{"value":"3.15","sigma":"9e-08","title":"semi-major axis","label":"a","units":"au","name":"a"},{"value":"1.54","sigma":"1.7e-07","name":"q","units":"au","label":"q","title":"perihelion distance"},{"label":"i","title":"inclination; angle with respect to x-y ecliptic plane","name":"i","units":"deg","sigma":"4.2e-06","value":"10.5"},{"sigma":"3.7e-05","value":"68.8","name":"om","units":"deg","label":"node","title":"longitude of the ascending node"},{"title":"argument of perihelion","label":"peri","units":"deg","name":"w","value":"179","sigma":"3.8e-05"},{"value":"337","sigma":"5.8e-06","units":"deg","name":"ma","label":"M","title":"mean anomaly"},{"sigma":"3.3e-05","value":"2457603.071","label":"tp","title":"time of perihelion passage","name":"tp","units":"TDB"},{"units":"d","name":"per","label":"period","title":"sidereal orbital period","value":"2040","sigma":"8.7e-05"},{"value":"0.177","sigma":"7.5e-09","units":"deg/d","name":"n","title":"mean motion","label":"n"},{"sigma":"1.4e-07","value":"4.75","title":"aphelion distance","label":"Q","name":"ad","units":"au"}],"first_obs":"2008-10-25","equinox":"J2000","two_body":null,"rms":"0.49","n_dop_obs_used":null,"moid":"0.529","not_valid_before":null,"epoch":"2457470.5","producer":"Davide Farnocchia","soln_date":"2025-12-29 09:30:51"}}