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12620 Simaqian (6335 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2012620
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1430467106030832 4.4684e-08  
a 3.098206948859903 2.6993e-08 AU
q 2.655018636057879 1.322e-07 AU
i .9175888923391508 6.0589e-06 deg
node 180.0579199180473 0.00034409 deg
peri 60.02837725848557 0.00034537 deg
M 77.5651134271385 2.4454e-05 deg
tp 2456571.331346535187
(2013-Oct-05.83134654)
0.00013551 JED
period 1991.884088359701
5.45
2.6032e-05
7.127e-08
d
yr
n .1807334081856423 2.362e-09 deg/d
Q 3.541395261661927 3.0855e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      979  
   data-arc span      19673 days (53.86 yr)  
   first obs. used      1960-09-24  
   last obs. used      2014-08-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54412  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Aug-13 14:20:53  

Additional Information
 Earth MOID = 1.64437 AU 
 T_jup = 3.207 
[ 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 13.7 mag n/a MPO266025  

12620 Simaqian           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Sima Qian (c. 145 B.C.-c. 85 B.C.) was a Chinese historian, counselor and court astrologer of the Han emperor Wu Di. He wrote a treatise on the Chinese calendar. His Shiji ("Records of the Grand Historian") contains the earliest systematical description of the Chinese constellations.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080122/MPCPages.arcLast Updated: 2008-03-05

[ show close-approach data ]
Alternate Designations
 6335 P-L = 1992 OD8 = 1996 DD7 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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