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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1445697787540194 2.7218e-08  
a 3.094546408286246 1.5161e-08 au
q 2.647168518696258 8.1307e-08 au
i .9187415564119241 4.3739e-06 deg
node 180.0177309573403 0.00019401 deg
peri 59.14577944753987 0.00019469 deg
M 116.3008846355983 1.7167e-05 deg
tp 2458558.145982880487
(2019-Mar-15.64598288)
9.3251e-05 TDB
period 1988.355005962205
5.44
1.4612e-05
4.001e-08
d
yr
n .1810541874667843 1.3305e-09 deg/d
Q 3.541924297876235 1.7352e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1784  
   data-arc span      22024 days (60.30 yr)  
   first obs. used      1960-09-24  
   last obs. used      2021-01-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52798  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:06:56  

Additional Information
 Earth MOID = 1.63369 au 
 Jupiter MOID = 1.46478 au 
 T_jup = 3.207 
[ show covariance matrix ]

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 13.78   n/a E2021B10  

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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