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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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1446311189542451 2.7941e-08  
a 3.095552424291599 1.6298e-08 au
q 2.647839213384779 8.4966e-08 au
i .9185386567641286 4.4395e-06 deg
node 180.01900878198 0.0002243 deg
peri 59.27893151178881 0.00022492 deg
M 79.94497450792876 1.7194e-05 deg
tp 2458558.731913069553
(2019-Mar-16.23191307)
9.411e-05 TDB
period 1989.324685808588
5.45
1.5711e-05
4.301e-08
d
yr
n .1809659341022419 1.4292e-09 deg/d
Q 3.543265635198419 1.8655e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1615  
   data-arc span      21912 days (59.99 yr)  
   first obs. used      1960-09-24  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53906  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 16:30:10  

Additional Information
 Earth MOID = 1.63574 au 
 Jupiter MOID = 1.46487 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 13.8   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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1918-Jul-01 12:02 00:03 Jupiter 1.69918761236323 1.6991859990584 1.69918922566526 1.91231645651607 1.63094473347358 2421776.001494002 2.61200703703911 60.6169780083238 28.2218819655129 -79.7810654429842 874685.860580072 T 24 CATAB v2.0f-lin.ifort 2020-Oct-22 16:30:45 2020-Oct-22 16:31
1928-May-19 05:51 00:02 Jupiter 1.52968775677214 1.52968695804659 1.52968855549856 1.5160711381146 1.09134170310626 2425385.743726348 2.36054165958944 227.894471787542 63.8940146695425 40.6413132296287 2149870.66048167 T 24 CATAB v2.0f-lin.ifort 2020-Oct-22 16:30:45 2020-Oct-22 16:31
1989-May-21 14:20 < 00:01 Jupiter 1.60074898580052 1.60074843744501 1.60074953415548 1.59978759730225 1.22516840105311 2447668.097476489 0.724213448345366 77.7086048344828 63.092149357359 -48.915896635006 1993277.0064191 T 24 CATAB v2.0f-lin.ifort 2020-Oct-22 16:30:45 2020-Oct-22 16:31
1999-Apr-08 22:47 < 00:01 Jupiter 1.60415646204807 1.60415601536712 1.60415690872874 1.80696473525213 1.48629968882817 2451277.449171326 0.447970421582466 55.2538439489598 28.2905189549779 67.103028315223 2416659.08584938 T 24 CATAB v2.0f-lin.ifort 2020-Oct-22 16:30:45 2020-Oct-22 16:31
2060-Apr-09 07:03 00:01 Jupiter 1.52988651411286 1.52988611452864 1.52988691369691 1.39766728654153 0.919876478796501 2473558.793458079 1.24968628945679 156.69840701505 96.0594786323619 -13.7355178229008 2392426.08100231 T 24 CATAB v2.0f-lin.ifort 2020-Oct-22 16:30:45 2020-Oct-22 16:31
2070-Feb-25 15:47 00:02 Jupiter 1.69618256031816 1.69618158152998 1.69618353910682 2.20041190270486 1.96037566329353 2477168.157860977 1.55141128322286 91.1007259202342 5.62084341773259 -88.862814508138 2285277.71784728 T 24 CATAB v2.0f-lin.ifort 2020-Oct-22 16:30:45 2020-Oct-22 16:31
2121-Apr-04 00:29 00:03 Jupiter 1.99728483456705 1.99728310161126 1.99728656752263 2.92155385249457 2.77259858812595 2495832.519914250 2.72514699083596 86.8698121433899 24.8519964029627 -50.0229103567884 1714270.81016963 T 24 CATAB v2.0f-lin.ifort 2020-Oct-22 16:30:45 2020-Oct-22 16:31
2131-Mar-05 10:21 00:03 Jupiter 1.49006095830623 1.49006047741714 1.49006143919583 1.30663415736317 0.755245893214922 2499454.931300393 3.16040493219677 292.807641599212 137.741047245306 -11.7786788482157 2343199.19642279 T 24 CATAB v2.0f-lin.ifort 2020-Oct-22 16:30:45 2020-Oct-22 16:31
2141-Jan-21 16:07 00:03 Jupiter 1.79861481104506 1.79861271842144 1.79861690367195 2.66223854039877 2.4790427807463 2503065.171590321 3.42137190956141 174.924203886288 10.2115837343825 -73.4324654233696 2228419.08841449 T 24 CATAB v2.0f-lin.ifort 2020-Oct-22 16:30:45 2020-Oct-22 16:31
2192-Mar-08 09:14 00:05 Jupiter 1.89561470145821 1.89561176742234 1.89561763549129 2.51501565452806 2.33058758009638 2521738.884865077 4.71460165493225 108.343301028766 26.4387475544952 -49.2590211236473 1099604.69651201 T 24 CATAB v2.0f-lin.ifort 2020-Oct-22 16:30:45 2020-Oct-22 16:31

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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