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5830 Simohiro (1991 EG)
Classification: Main-belt Asteroid          SPK-ID: 2005830
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2025897581314552 5.1057e-08  
a 2.27378893662617 9.5797e-09 au
q 1.813142585913096 1.1366e-07 au
i 5.270013686142033 5.6096e-06 deg
node 48.28067229570354 5.9043e-05 deg
peri 81.41845961566416 6.0753e-05 deg
M 115.50574403491 1.4808e-05 deg
tp 2456998.686307825581
(2014-Dec-07.18630783)
5.1082e-05 JED
period 1252.344031817772
3.43
7.9144e-06
2.167e-08
d
yr
n .2874609459171228 1.8167e-09 deg/d
Q 2.734435287339244 1.152e-08 au
  Orbit Determination Parameters
   # obs. used (total)      926  
   data-arc span      12459 days (34.11 yr)  
   first obs. used      1981-05-08  
   last obs. used      2015-06-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54931  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:52:31  

Additional Information
 Earth MOID = .836959 au 
 Jupiter MOID = 2.34204 au 
 T_jup = 3.578 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.0 mag n/a MPO337302  
rotation period rot_per 58.0522 h n/a LCDB (Rev. 2015-December); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

5830 Simohiro           Discovered 1991 Mar. 9 by T. Niijima and T. Urata at Ojima.
Hiroshi Shimoda (b. 1949) is a Japanese amateur astronomer and specialist in agricultural management in Gunma prefecture. He is a devoted observer of small bodies in the solar system. As an early member of the astronomical society Ota-Uchuno-Kai he encouraged many amateur astronomers.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050523/MPCPages.arcLast Updated: 2005-07-21

Alternate Designations
 1991 EG = 1984 CC 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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