+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   31443 (1999 CL2) Classification: Main-belt Asteroid          SPK-ID: 2031443 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ 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 .1488204741189664 8.0037e-08   a 2.271245304436766 1.8159e-08 AU q 1.93323750139001 1.8571e-07 AU i 5.095754982577658 7.0747e-06 deg node 278.4607025484072 9.4911e-05 deg peri 110.2870739657856 0.00010092 deg M 129.8887137419486 3.5385e-05 deg tp 2455949.409785662044 (2012-Jan-22.90978566) 0.0001194 JED period 1250.24316958201 3.42 1.4994e-05 4.105e-08 d yr n .2879439846252932 3.4533e-09 deg/d Q 2.609253107483521 2.0862e-08 AU   Orbit Determination Parameters    # obs. used (total)      461      data-arc span      5758 days (15.76 yr)      first obs. used      1997-07-02      last obs. used      2013-04-07      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .652      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 14:58:02   Additional Information  Earth MOID = .944796 AU   T_jup = 3.592  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.3 mag n/a PDS3 (MPO 18767)   31443 (1999 CL2)          Discovered 1999-Feb-05 by BAO Schmidt CCD Asteroid Program at Xinglong (327) Reference: 20011130/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-22 08:20 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin