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25143 Itokawa (1998 SF36)
Classification: Apollo [NEO, PHA]          SPK-ID: 2025143
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 183 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2801199823230188 1.4893e-09  
a 1.324140950838427 2.5116e-09 au
q .9532226110963814 3.7322e-09 au
i 1.621449416001878 2.2409e-07 deg
node 69.08002939412364 5.5635e-06 deg
peri 162.7951115722801 5.6066e-06 deg
M 2.073188195424049 8.454e-06 deg
tp 2457597.294941367443
1.306e-05 JED
period 556.5443167518828
n .6468487578869561 1.8404e-09 deg/d
Q 1.695059290580472 3.2152e-09 au
  Orbit Determination Parameters
   # obs. used (total)      836  
   # delay obs. used      19  
   # Doppler obs. used      18  
   data-arc span      6336 days (17.35 yr)  
   first obs. used      1998-09-19  
   last obs. used      2016-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .47337  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 20:37:07  

Additional Information
 Earth MOID = .012995 au 
 Jupiter MOID = 3.29483 au 
 T_jup = 4.898 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 19.2 mag n/a PDS3 (MPO 12525)  
diameter diameter 0.33 km n/a Science 312:1330-1334 based on a spheroid of equivalent volume: 1.84e7 m^3
extent extent 0.535x0.294x0.209 km 0.001 Science 312:1330-1334  
GM GM 2.1e-9 km^3/s^2 0.063e-9 Science 312:1330-1334 derived from published mass of 3.51e10 kg +/- 3%
bulk density density 1.9 g/cm^3 0.13 Science 312:1330-1334 Porosity 41%
rotation period rot_per 12.132 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Lambert, J.S.; Tholen, D.J. (2001) Bul. Amer. Astron. Soc. 33, 1402.]
[Lowry, S.C.; Weissman, P.R.; Hicks, M.D. (2001) Bul. Amer. Astron. Soc. 33, 1150.]
[Dermawan, B.; Nakamura, T.; Fukushima, H.; Sato, H.; et al. (2002) Publ. 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 Bul. 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 and Planetary Science XXXVI, 1833.]
[Durech, J.; Vokrouhlicky, D.; Kaasalainen, M.; Weissman, P.; et al. (2008) Astron. Astrophys. 488, 345-350.]
[Higgins, D.J. (2011) id/lightcurves.htm]
SMASSII spectral type spec_B S(IV)   n/a Binzel et al. (2001) Planet. Sci. 36, 1167-1172  

25143 Itokawa           Discovered 1998 Sept. 26 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Hideo Itokawa (1912-1999) is regarded as the Father of Japanese rocketry. An aerospace engineer, Itokawa initiated Japan's first launch tests of the solid rocket series called "Pencil" in 1955. Under his unique vision and strong leadership, his rockets reached space by 1960 and put Japan's first satellite into orbit in 1970.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030806/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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