+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   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 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1426660076044525 6.5512e-08   a 3.097262149206911 2.4669e-08 AU q 2.655388123875175 2.097e-07 AU i .9174724987495643 7.2391e-06 deg node 180.0760646086468 0.00037055 deg peri 60.11012152943741 0.00037193 deg M 329.0439858538456 3.0147e-05 deg tp 2456571.701635934104 (2013-Oct-06.20163593) 0.00016709 JED period 1990.973018854685 5.45 2.3786e-05 6.512e-08 d yr n .1808161118160664 2.1602e-09 deg/d Q 3.539136174538647 2.8188e-08 AU   Orbit Determination Parameters    # obs. used (total)      897      data-arc span      19202 days (52.57 yr)      first obs. used      1960-09-24      last obs. used      2013-04-21      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .58441      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:49:19   Additional Information  Earth MOID = 1.64339 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 13.6 mag n/a PDS3 (MPC 36774)   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.arc Last 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 ] 2013-May-21 10:42 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin