+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   312871 (2011 UL161) Classification: Main-belt Asteroid          SPK-ID: 2312871 [ 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 .1188561545626145 1.0104e-07   a 3.069621508682002 4.897e-08 au q 2.704778100197369 3.1223e-07 au i 3.200855633343805 8.8497e-06 deg node 348.6066150517558 0.00013684 deg peri 34.73827686993859 0.00014031 deg M 239.7069386855084 3.1649e-05 deg tp 2459656.892707367252 (2022-Mar-18.39270737) 0.00017935 TDB period 1964.380755382302 5.38 4.7007e-05 1.287e-07 d yr n .1832638601318092 4.3854e-09 deg/d Q 3.434464917166637 5.479e-08 au   Orbit Determination Parameters    # obs. used (total)      135      data-arc span      4965 days (13.59 yr)      first obs. used      2005-08-29      last obs. used      2019-04-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52463      source      ORB      producer      Otto Matic      solution date      2019-Jul-14 14:24:08   Additional Information  Earth MOID = 1.70879 au   Jupiter MOID = 2.03402 au   T_jup = 3.218  [ 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 16.3   n/a MPO434005   312871 (2011 UL161)          Discovered 2005-Aug-29 by Spacewatch at Kitt Peak Reference: 20120109/Numbers.arc Last Updated: 2012-01-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-05 21:29 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin