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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1429701019080362 5.2012e-08  
a 3.098327874917482 2.8363e-08 AU
q 2.65535962289602 1.5994e-07 AU
i .9174468207306086 6.529e-06 deg
node 180.0658954519234 0.00035117 deg
peri 60.05426452760293 0.0003524 deg
M 41.39704234228573 2.5735e-05 deg
tp 2456571.436284374214
(2013-Oct-05.93628437)
0.00014223 JED
period 1992.000707283618
5.45
2.7353e-05
7.489e-08
d
yr
n .1807228273984461 2.4816e-09 deg/d
Q 3.541296126938944 3.2418e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      953  
   data-arc span      19644 days (53.78 yr)  
   first obs. used      1960-09-24  
   last obs. used      2014-07-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55042  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:28:49  

Additional Information
 Earth MOID = 1.64318 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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