{"orbit":{"condition_code":"0","t_jup":"4.898","sb_used":"SB441-N16","pe_used":"DE441","model_pars":[{"sigma":"7.198E-15","title":"non-grav. transverse accel.","kind":"EST","value":"-2.855e-14","desc":"non-gravitational transverse acceleration parameter","name":"A2","units":"au/d^2","n":1},{"name":"ALN","units":null,"desc":"normalizing factor [default 0.1112620426]","n":0,"kind":"SET","value":"1.","title":"normalizing factor","sigma":null},{"title":"non-grav. model exp. k","sigma":null,"n":0,"desc":"non-grav. model constant, exponent k [default 4.6142]","name":"NK","units":null,"kind":"SET","value":"0."},{"title":"non-grav. model exp. m","sigma":null,"n":0,"units":null,"name":"NM","desc":"non-grav. model constant, exponent m [default 2.15]","value":"2.","kind":"SET"},{"sigma":null,"title":"normalizing distance","kind":"SET","value":"1.","n":0,"desc":"normalizing distance, au [default 2.808 au]","units":"au","name":"R0"}],"cov_epoch":"2453005.5","not_valid_after":null,"data_arc":"9588","n_obs_used":1025,"comment":"Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2","moid_jup":"3.29","orbit_id":"237","last_obs":"2024-12-19","source":"JPL","equinox":"J2000","first_obs":"1998-09-19","elements":[{"sigma":"2.1e-09","value":"0.28","label":"e","title":"eccentricity","units":null,"name":"e"},{"value":"1.32","sigma":"4.1e-09","name":"a","units":"au","label":"a","title":"semi-major axis"},{"sigma":"1.5e-09","value":"0.953","label":"q","title":"perihelion distance","units":"au","name":"q"},{"label":"i","title":"inclination; angle with respect to x-y ecliptic plane","units":"deg","name":"i","sigma":"2.7e-07","value":"1.62"},{"name":"om","units":"deg","label":"node","title":"longitude of the ascending node","value":"69.1","sigma":"6.2e-06"},{"sigma":"6.1e-06","value":"163","units":"deg","name":"w","title":"argument of perihelion","label":"peri"},{"label":"M","title":"mean anomaly","units":"deg","name":"ma","sigma":"7.5e-06","value":"171"},{"units":"TDB","name":"tp","title":"time of perihelion passage","label":"tp","sigma":"1.1e-05","value":"2460936.703"},{"value":"556","sigma":"2.6e-06","title":"sidereal orbital period","label":"period","name":"per","units":"d"},{"value":"0.647","sigma":"3e-09","units":"deg/d","name":"n","label":"n","title":"mean motion"},{"label":"Q","title":"aphelion distance","name":"ad","units":"au","value":"1.7","sigma":"5.3e-09"}],"n_del_obs_used":21,"two_body":null,"n_dop_obs_used":18,"rms":"0.37","moid":"0.013","epoch":"2461200.5","producer":"Giorgini","not_valid_before":null,"soln_date":"2025-05-22 17:09:17"},"object":{"neo":true,"des":"25143","spkid":"20025143","orbit_id":"237","fullname":"25143 Itokawa (1998 SF36)","shortname":"25143 Itokawa","orbit_class":{"name":"Apollo","code":"APO"},"pha":true,"kind":"an","prefix":null},"phys_par":[{"value":"19.26","notes":null,"name":"H","units":null,"desc":"absolute magnitude (magnitude at 1 au from Sun and observer)","ref":"MPO691964","sigma":null,"title":"absolute magnitude"},{"ref":"Science 312:1330-1334","sigma":null,"title":"diameter","notes":"based on a spheroid of equivalent volume: 1.84e7 m^3","value":"0.33","desc":"effective body diameter","name":"diameter","units":"km"},{"ref":"Science 312:1330-1334","sigma":"0.001","title":"extent","value":"0.535x0.294x0.209","notes":null,"desc":"tri(or bi)-axial body dimensions","units":"km","name":"extent"},{"title":"GM","ref":"Science 312:1330-1334","sigma":"0.063e-9","desc":"standard gravitational parameter: product of the mass (M) and gravitational constant (G)","units":"km^3/s^2","name":"GM","value":"2.1e-9","notes":"derived from published mass of 3.51e10 kg +/- 3%"},{"ref":"Science 312:1330-1334","sigma":"0.13","title":"bulk density","notes":"Porosity 41%","value":"1.9","name":"density","units":"g/cm^3","desc":"bulk density"},{"value":"12.132","notes":"REFERENCE LIST:[Lambert, J.S.; Tholen, D.J. (2001) Bull. Amer. Astron. Soc. 33, 1402.], [Lowry, S.C.; Weissman, P.R.; Hicks, M.D. (2001) Bull. Amer. Astron. Soc. 33, 1150.], [Dermawan, B.; Nakamura, T.; Fukushima, H.; Sato, H.; et al. (2002) Pub. Astron. Soc. Japan 54, 635-640.], [Kaasalainen, M.; et al. (2003) Astron. Astrophys. 405, L29-L32.], [Ohba, Y.; Abe, M.; Hasagawa, S.; Ishiguro, M.; et al. (2005) Earth Planets Space 55, 341-347.], [Warner, B.D. (2004) Minor Planet Bull. 31, 67-70.], [Lowry, S.; Weissman, P.R.; Hicks, M.D.; Whiteley, R.J.; Larson, S. (2005) Icarus 176, 408-417.], [Nishihara, S.; Abe, M.; Hasagawa, S.; Ishiguro, M.; et al. (2005) Lunar & Planetary Sci. XXXVI, 1833.], [Durech, J.; Vokrouhlicky, D.; Kaasalainen, M.; Weissman, P.; et al. (2008) Astron. Astrophys. 488, 345-350.], [Higgins, D.J. (2011) http://www.david-higgins.com/Astronomy/asteroid/lightcurves.htm], [Nishihara, S.; Kitzato, K.; Abe, M.; Hasegawa, S.; et al. (2018) ArXiv:2018.80202742.]","name":"rot_per","units":"h","desc":"body rotation period (synodic)","ref":"LCDB (Rev. 2023-October); Warner et al., 2009","sigma":null,"title":"rotation period"},{"title":"pole direction","ref":"Demura, H., et al., Science, 312, 1347 (2006)","sigma":"3.9","desc":"spin-pole direction in R.A./Dec.","units":null,"name":"pole","notes":null,"value":"90.53/-66.30"},{"desc":"Thermal inertia of the small-body surface","units":"J/m^2/s^0.5/K","name":"I","notes":null,"value":"700","title":"thermal inertia","ref":"Muller, T.G., et al., Publications of the Astronomical Society of Japan, 66, 52 (2014)","sigma":"200"},{"notes":null,"value":"S(IV)","name":"spec_B","units":null,"desc":"SMASSII spectral taxonomic classification","sigma":null,"ref":"Binzel et al. (2001) Planet. Sci. 36, 1167-1172","title":"SMASSII spectral type"}],"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"}}