+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2011 WA) Classification: Aten [NEO]          SPK-ID: 3587872 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2855530874155591 5.3599e-07   a .8446972553249166 1.4913e-09 au q .6034913461354378 4.524e-07 au i 30.38399649817903 7.454e-05 deg node 51.52273868693653 3.8776e-06 deg peri 206.1162868190236 9.3163e-05 deg M 28.75148167244332 0.00018305 deg tp 2459177.853151172807 (2020-Nov-24.35315117) 0.00014415 TDB period 283.5633192985461 0.78 7.5095e-07 2.056e-09 d yr n 1.269557716035121 3.3621e-09 deg/d Q 1.085903164514395 1.9172e-09 au   Orbit Determination Parameters    # obs. used (total)      253      data-arc span      2561 days (7.01 yr)      first obs. used      2011-11-16      last obs. used      2018-11-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .34425      source      ORB      producer      Otto Matic      solution date      2021-Apr-15 05:46:00   Additional Information  Earth MOID = .0501793 au   Jupiter MOID = 3.95275 au   T_jup = 6.826  [ 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 21.6   n/a MPO227507   [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Apr-17 09:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin