+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   392239 (2009 WP12) Classification: Jupiter Trojan          SPK-ID: 2392239 [ 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 11 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04681749357528083 1.4834e-07   a 5.160883177918762 3.3631e-07 au q 4.919263562893775 9.9395e-07 au i 8.525816821551187 8.3237e-06 deg node 75.61857203086824 8.1509e-05 deg peri 272.6586930282887 0.00017243 deg M 26.16066152777612 0.00013763 deg tp 2458689.306375690467 (2019-Jul-24.80637569) 0.0016579 TDB period 4282.372776868975 11.72 0.00041859 1.146e-06 d yr n .08406554467759608 8.2173e-09 deg/d Q 5.402502792943748 3.5206e-07 au   Orbit Determination Parameters    # obs. used (total)      91      data-arc span      4004 days (10.96 yr)      first obs. used      2008-10-07      last obs. used      2019-09-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .61248      source      ORB      producer      Otto Matic      solution date      2019-Nov-08 13:03:56   Additional Information  Earth MOID = 3.92649 au   Jupiter MOID = .0529229 au   T_jup = 2.976  [ 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 14.1   n/a MPO455784   392239 (2009 WP12)          Discovered 2009-Nov-16 by Mt. Lemmon Survey at Mount Lemmon Reference: Last Updated: 2014-04-17 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-04 18:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin