+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   266858 (2009 UK99) Classification: Main-belt Asteroid          SPK-ID: 2266858 [ 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 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07115998253846151 6.2244e-08   a 3.162648227816478 4.0349e-08 au q 2.937594235149761 2.0979e-07 au i 2.824632869174439 5.2012e-06 deg node 83.14857389707139 0.00013669 deg peri 271.4431528550717 0.00014214 deg M 2.084873515316099 3.9084e-05 deg tp 2458988.602602484771 (2020-May-19.10260248) 0.00022299 TDB period 2054.351534526013 5.62 3.9314e-05 1.076e-07 d yr n .1752377789047971 3.3535e-09 deg/d Q 3.387702220483194 4.322e-08 au   Orbit Determination Parameters    # obs. used (total)      218      data-arc span      6767 days (18.53 yr)      first obs. used      2001-03-20      last obs. used      2019-09-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .60164      source      ORB      producer      Otto Matic      solution date      2019-Nov-08 04:06:53   Additional Information  Earth MOID = 1.93434 au   Jupiter MOID = 1.96824 au   T_jup = 3.199  [ 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 15.7   n/a MPO450147   266858 (2009 UK99)          Discovered 2009-Oct-23 by Mt. Lemmon Survey at Mount Lemmon Reference: 20110218/Numbers.arc Last Updated: 2011-02-22 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-15 07:23 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin