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

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .144631148686279 2.9167e-08  
a 3.095552423223995 1.834e-08 au
q 2.647839120434514 9.0703e-08 au
i .9185413786388961 4.5575e-06 deg
node 180.018889289489 0.00024797 deg
peri 59.27905190908309 0.00024861 deg
M 79.94497133783665 1.8054e-05 deg
tp 2458558.731930815708
(2019-Mar-16.23193082)
9.8917e-05 TDB
period 1989.324684779461
5.45
1.7679e-05
4.84e-08
d
yr
n .18096593419586 1.6083e-09 deg/d
Q 3.543265726013476 2.0993e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1438  
   data-arc span      21057 days (57.65 yr)  
   first obs. used      1960-09-24  
   last obs. used      2018-05-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54597  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-May-31 13:23:11  

Additional Information
 Earth MOID = 1.63574 au 
 Jupiter MOID = 1.46487 au 
 T_jup = 3.207 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456146.5 (2012-Aug-07.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1424800795826474 2.9295e-08  
q 2.655060945268679 9.0908e-08 au
tp 2456572.134557408660
(2013-Oct-06.63455741)
9.868e-05 TDB
node 180.0760075846982 0.00024798 deg
peri 60.21001602438317 0.00024863 deg
i .9174689982739381 4.5579e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1438  
   data-arc span      21057 days (57.65 yr)  
   first obs. used      1960-09-24  
   last obs. used      2018-05-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54597  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-May-31 13:23:11  

Additional Information
 Jupiter MOID = 1.46487 au 
 T_jup = 3.207 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.582036532940748E-16 -2.62399256867539E-15 1.154386824306975E-13 -5.670853192441762E-15 2.483322213906079E-14 9.66747221614442E-18
q -2.62399256867539E-15 8.264280379908412E-15 -3.717698304574846E-13 2.713125658614802E-14 -9.761438913976988E-14 -4.567800147166281E-17
tp 1.154386824306975E-13 -3.717698304574846E-13 9.73770836765936E-9 -3.638228757547389E-12 1.7955356564679E-9 -5.134011004767421E-13
node -5.670853192441762E-15 2.713125658614802E-14 -3.638228757547389E-12 6.149218394900173E-8 -6.14841953843839E-8 -3.843086789136393E-10
peri 2.483322213906079E-14 -9.761438913976988E-14 1.7955356564679E-9 -6.14841953843839E-8 6.181460409761361E-8 3.841624601300967E-10
i 9.66747221614442E-18 -4.567800147166281E-17 -5.134011004767421E-13 -3.843086789136393E-10 3.841624601300967E-10 2.077447661840655E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.8   n/a MPO473937  

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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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