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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 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1430467213727956 4.3541e-08  
a 3.098206945282176 2.6787e-08 AU
q 2.655018599625137 1.2777e-07 AU
i .9175899655362042 5.9707e-06 deg
node 180.0579653613883 0.00034025 deg
peri 60.02833022566863 0.00034153 deg
M 77.56511663945453 2.4285e-05 deg
tp 2456571.331329504795
(2013-Oct-05.83132950)
0.00013466 JED
period 1991.88408490944
5.45
2.5832e-05
7.072e-08
d
yr
n .1807334084987015 2.3439e-09 deg/d
Q 3.541395290939216 3.0618e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1006  
   data-arc span      19739 days (54.04 yr)  
   first obs. used      1960-09-24  
   last obs. used      2014-10-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5391  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 13:17:47  

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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