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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1435759763910781 4.3131e-08  
a 3.096753706159677 2.5577e-08 au
q 2.652134269155112 1.2531e-07 au
i .9181459548615618 5.4783e-06 deg
node 180.0729590471817 0.0002905 deg
peri 59.93909574465272 0.00029157 deg
M 186.0900790025221 2.15e-05 deg
tp 2458562.068621983696
(2019-Mar-19.56862198)
0.00012168 JED
period 1990.482785160662
5.45
2.466e-05
6.752e-08
d
yr
n .1808606448063014 2.2407e-09 deg/d
Q 3.541373143164241 2.925e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1192  
   data-arc span      20234 days (55.40 yr)  
   first obs. used      1960-09-24  
   last obs. used      2016-02-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53374  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 18:50:55  

Additional Information
 Earth MOID = 1.63972 au 
 Jupiter MOID = 1.46558 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 13.8 mag n/a MPO347625  

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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