+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2011 UG21) Classification: Aten [NEO]          SPK-ID: 3582232 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5470074557537842 3.7719e-07   a .936976244677305 1.7055e-08 au q .4244432529746373 3.4741e-07 au i 14.56669542527377 1.1702e-05 deg node 86.60873214575405 8.3606e-05 deg peri 82.4108135461116 8.0823e-05 deg M 64.61139568177084 6.3834e-05 deg tp 2458941.043694575114 (2020-Apr-01.54369458) 5.7678e-05 TDB period 331.2770096838777 0.91 9.0447e-06 2.476e-08 d yr n 1.086703844445865 2.967e-08 deg/d Q 1.449509236379973 2.6384e-08 au   Orbit Determination Parameters    # obs. used (total)      82      data-arc span      3369 days (9.22 yr)      first obs. used      2011-10-19      last obs. used      2021-01-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      1      norm. resid. RMS      .36719      source      ORB      producer      Otto Matic      solution date      2021-Jan-08 05:36:19   Additional Information  Earth MOID = .128332 au   Jupiter MOID = 3.57529 au   T_jup = 6.241  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 19.4   n/a MPO477653   [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Jan-20 14:49 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin