+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   410946 (2009 ST311) Classification: Main-belt Asteroid          SPK-ID: 2410946 [ 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 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06005938683444768 6.6468e-08   a 2.861893551264221 3.7679e-08 au q 2.690009979389832 2.0128e-07 au i 2.191188685228636 7.7948e-06 deg node 164.5010013909537 0.00017982 deg peri 250.4418126540773 0.00019665 deg M 22.98028044989517 7.4589e-05 deg tp 2458887.616240536747 (2020-Feb-08.11624054) 0.00036642 TDB period 1768.392404756602 4.84 3.4923e-05 9.561e-08 d yr n .2035747264191341 4.0203e-09 deg/d Q 3.03377712313861 3.9942e-08 au   Orbit Determination Parameters    # obs. used (total)      126      data-arc span      5107 days (13.98 yr)      first obs. used      2005-12-04      last obs. used      2019-11-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .58891      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 13:47:59   Additional Information  Earth MOID = 1.70224 au   Jupiter MOID = 2.18053 au   T_jup = 3.298  [ 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 16.9   n/a MPO419026   410946 (2009 ST311)          Discovered 2009-Sep-18 by Mt. Lemmon Survey at Mount Lemmon Reference: Last Updated: 2014-10-09 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-19 19:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin