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

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 199 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2800888606247404 1.2972e-09  
a 1.324198516042437 2.0049e-09 au
q .9533052624431391 3.1083e-09 au
i 1.621223075515472 1.9411e-07 deg
node 69.0774533640386 4.936e-06 deg
peri 162.8196121213398 4.9699e-06 deg
M 83.76654562469453 9.6283e-06 deg
tp 2459266.992124912617
1.4592e-05 TDB
period 556.5806096427297
n .6468065788908542 1.4689e-09 deg/d
Q 1.695091769641736 2.5664e-09 au
  Orbit Determination Parameters
   # obs. used (total)      886  
   # delay obs. used      19  
   # Doppler obs. used      18  
   data-arc span      8092 days (22.15 yr)  
   first obs. used      1998-09-19  
   last obs. used      2020-11-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45996  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Sep-11 06:31:27  

Additional Information
 Earth MOID = .0129889 au 
 Jupiter MOID = 3.29424 au 
 T_jup = 4.898 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 18.95   n/a MPCxxxxx  
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. 2020-October); Warner et al., 2009 Published 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)]
[Nishihara, S.; Kitzato, K.; Abe, M.; Hasegawa, S.; et al. (2018) ArXiv:2018.80202742.]
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

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