{"orbit":{"n_dop_obs_used":null,"pe_used":"DE441","t_jup":"3.026","equinox":"J2000","not_valid_before":null,"moid":"0.166","two_body":null,"orbit_id":"K273/26","moid_jup":"0.917","condition_code":"1","model_pars":[{"units":"au/d^2","desc":"non-gravitational radial acceleration parameter","kind":"EST","title":"non-grav. radial accel.","value":"6.106e-11","name":"A1","n":1,"sigma":"3.581E-11"},{"desc":"non-gravitational transverse acceleration parameter","units":"au/d^2","kind":"EST","title":"non-grav. transverse accel.","name":"A2","value":"3.598e-12","n":2,"sigma":"3.964E-13"}],"sb_used":"SB441-N16","data_arc":"2919","last_obs":"2026-11-02","source":"JPL","not_valid_after":null,"first_obs":"2018-11-05","comment":null,"epoch":"2460540.5","soln_date":"2026-11-03 16:11:13","n_del_obs_used":null,"n_obs_used":1503,"producer":"Davide Farnocchia","elements":[{"units":null,"name":"e","value":"0.847","title":"eccentricity","label":"e","sigma":"1.2e-07"},{"units":"au","name":"a","value":"2.22","label":"a","title":"semi-major axis","sigma":"1.6e-07"},{"title":"perihelion distance","label":"q","name":"q","units":"au","value":"0.339","sigma":"2.9e-07"},{"title":"inclination; angle with respect to x-y ecliptic plane","label":"i","units":"deg","name":"i","value":"11.3","sigma":"1.5e-05"},{"sigma":"5.5e-05","name":"om","value":"334","units":"deg","label":"node","title":"longitude of the ascending node"},{"units":"deg","name":"w","value":"187","label":"peri","title":"argument of perihelion","sigma":"5.6e-05"},{"label":"M","title":"mean anomaly","name":"ma","units":"deg","value":"89.6","sigma":"1.7e-05"},{"sigma":"4.4e-05","units":"TDB","name":"tp","value":"2460240.032","title":"time of perihelion passage","label":"tp"},{"value":"1210","name":"per","units":"d","label":"period","title":"sidereal orbital period","sigma":"0.00013"},{"sigma":"3.2e-08","name":"n","value":"0.298","units":"deg/d","label":"n","title":"mean motion"},{"title":"aphelion distance","label":"Q","name":"ad","units":"au","value":"4.1","sigma":"2.9e-07"}],"rms":"0.37","cov_epoch":"2460540.5"},"signature":{"version":"1.3","source":"NASA/JPL Small-Body Database (SBDB) API"},"object":{"des":"2P","pha":false,"orbit_class":{"name":"Encke-type Comet","code":"ETc"},"orbit_id":"K273/26","neo":true,"prefix":"P","spkid":"1000025","fullname":"2P/Encke","kind":"cn"},"phys_par":[{"ref":"K273/26","desc":"absolute magnitude of comet and coma (i.e. total)","units":null,"name":"M1","notes":"2 parameter fit from 1412 observations, autocmod 3.0g","value":"15.7","title":"comet total magnitude","sigma":"0.7"},{"ref":"K273/26","desc":"comet total magnitude slope parameter","units":null,"notes":"autocmod 3.0g","name":"K1","value":"4.5","title":"comet total magnitude slope","sigma":null},{"ref":"Lamy,P.L.;Toth,I.;Fernandez,Y.R.;Weaver,H.A. (2004) Comets II, pp. 223-264","desc":"effective body diameter","units":"km","sigma":null,"value":"4.8","notes":null,"name":"diameter","title":"diameter"},{"title":"rotation period","value":"11.083","notes":"[Result based on less than full coverage, so that the period may be wrong by 30 percent or so.]  REFERENCE LIST:[Fernandez, Y.R.; Lowry, S.C.; Weissman, P.R.; Mueller, B.E.A.; et al. (2005) Icarus 175, 194-214.], [Lowry, S.C.; Weissman, P.R. (2007) Icarus 188, 212-223.]","name":"rot_per","sigma":null,"desc":"body rotation period (synodic)","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","units":"h"},{"desc":"geometric albedo","ref":"Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)","units":null,"notes":null,"value":"0.046","name":"albedo","title":"geometric albedo","sigma":"0.023"}]}