+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   173807 (2001 SG238) Classification: Main-belt Asteroid          SPK-ID: 2173807 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 10 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08449904124924669 9.0228e-08   a 2.934367378506888 2.7103e-08 au q 2.686416148349991 2.6709e-07 au i 2.328945680475908 9.9088e-06 deg node 169.6431523556388 0.0001545 deg peri 215.2396314900066 0.00015996 deg M 246.2073265416864 4.3592e-05 deg tp 2459580.839265761635 (2022-Jan-01.33926576) 0.00022716 TDB period 1835.989342061855 5.03 2.5437e-05 6.964e-08 d yr n .1960795696099806 2.7166e-09 deg/d Q 3.182318608663786 2.9393e-08 au   Orbit Determination Parameters    # obs. used (total)      283      data-arc span      6441 days (17.63 yr)      first obs. used      2001-09-11      last obs. used      2019-05-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57521      source      ORB      producer      Otto Matic      solution date      2019-Jul-13 11:42:24   Additional Information  Earth MOID = 1.69038 au   Jupiter MOID = 2.23106 au   T_jup = 3.269  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.2   n/a MPO433117   173807 (2001 SG238)          Discovered 2001-Sep-19 by LINEAR at Socorro Reference: 20080122/Numbers.arc Last Updated: 2008-01-28 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-11 08:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin