+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   392250 (2009 WR168) Classification: Main-belt Asteroid          SPK-ID: 2392250 [ 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 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1626190116828459 7.7892e-08   a 2.346460083094477 2.2361e-08 au q 1.964881063428405 1.8563e-07 au i 3.177787668147052 8.1314e-06 deg node 92.79399740655528 0.00016794 deg peri 347.1344450950285 0.00017047 deg M 323.0530333843893 2.9505e-05 deg tp 2459135.239356896120 (2020-Oct-12.73935690) 0.00010829 TDB period 1312.859293355588 3.59 1.8766e-05 5.138e-08 d yr n .2742106498556003 3.9197e-09 deg/d Q 2.728039102760549 2.5997e-08 au   Orbit Determination Parameters    # obs. used (total)      90      data-arc span      5540 days (15.17 yr)      first obs. used      2005-09-11      last obs. used      2020-11-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .74382      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 06:51:41   Additional Information  Earth MOID = .980744 au   Jupiter MOID = 2.50117 au   T_jup = 3.541  [ hide covariance matrix ] Orbital Elements at Epoch 2457415.5 (2016-Jan-28.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .162037060086763 7.7571e-08   q 1.966850652111896 1.8477e-07 au tp 2457819.395872237119 (2017-Mar-06.89587224) 0.00010358 TDB node 92.82594972051375 0.00016814 deg peri 346.5386575439182 0.00017071 deg i 3.176247831990605 8.1237e-06 deg   Orbit Determination Parameters    # obs. used (total)      90      data-arc span      5540 days (15.17 yr)      first obs. used      2005-09-11      last obs. used      2020-11-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .74382      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 06:51:41   Additional Information  Jupiter MOID = 2.50117 au   T_jup = 3.541  Orbit Covariance (6×6)   e q tp node peri i e 6.01723516328167E-15 -1.425913996204844E-14 -9.449312626457975E-13 -8.897881388291248E-14 4.075163818512998E-14 -2.951381804847836E-15 q -1.425913996204844E-14 3.414140888026267E-14 2.646177222360413E-12 2.019862731204356E-13 -1.83799871551867E-14 7.637363502251457E-15 tp -9.449312626457975E-13 2.646177222360413E-12 1.072891585396433E-8 -8.131097595334863E-11 3.111489282270063E-9 6.417399209354032E-12 node -8.897881388291248E-14 2.019862731204356E-13 -8.131097595334863E-11 2.827250636986808E-8 -2.825174985925122E-8 -5.167524067507895E-11 peri 4.075163818512998E-14 -1.83799871551867E-14 3.111489282270063E-9 -2.825174985925122E-8 2.914070469591628E-8 5.337691180771324E-11 i -2.951381804847836E-15 7.637363502251457E-15 6.417399209354032E-12 -5.167524067507895E-11 5.337691180771324E-11 6.599379573123942E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 17.6   n/a MPO476849   392250 (2009 WR168)          Discovered 2009-Nov-22 by Spacewatch at Kitt Peak Reference: Last Updated: 2014-04-17 Alternate Designations  2009 WR168 = 2007 EP65  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-26 10:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin