+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   90976 (1997 WH38) Classification: Main-belt Asteroid          SPK-ID: 2090976 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1640914388922819 4.5594e-08   a 2.289313021510417 1.0157e-08 au q 1.913656353735936 1.0534e-07 au i 4.898927215966642 4.3307e-06 deg node 246.8888390743735 6.3005e-05 deg peri 150.5738168891708 6.469e-05 deg M 198.1912294430905 1.7044e-05 deg tp 2459569.164021493294 (2021-Dec-20.66402149) 6.2134e-05 TDB period 1265.191293605339 3.46 8.4203e-06 2.305e-08 d yr n .2845419517345316 1.8937e-09 deg/d Q 2.664969689284899 1.1824e-08 au   Orbit Determination Parameters    # obs. used (total)      627      data-arc span      8189 days (22.42 yr)      first obs. used      1997-11-26      last obs. used      2020-04-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55163      source      ORB      producer      Otto Matic      solution date      2020-May-20 16:36:54   Additional Information  Earth MOID = .923062 au   Jupiter MOID = 2.74565 au   T_jup = 3.577  [ hide covariance matrix ] Orbital Elements at Epoch 2457111.5 (2015-Mar-30.0) TDB Reference: JPL 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1629349484279399 4.5438e-08   q 1.916605469387807 1.0484e-07 au tp 2457038.054319866544 (2015-Jan-15.55431987) 5.4279e-05 TDB node 246.9944125182539 6.3073e-05 deg peri 150.4387077208123 6.4791e-05 deg i 4.895349308374719 4.3261e-06 deg   Orbit Determination Parameters    # obs. used (total)      627      data-arc span      8189 days (22.42 yr)      first obs. used      1997-11-26      last obs. used      2020-04-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55163      source      ORB      producer      Otto Matic      solution date      2020-May-20 16:36:54   Additional Information  Jupiter MOID = 2.74565 au   T_jup = 3.577  Orbit Covariance (6×6)   e q tp node peri i e 2.064639256778261E-15 -4.74779178291474E-15 -9.628999383947453E-13 3.218656599152407E-14 -2.950040723510932E-13 -2.193580577661381E-15 q -4.74779178291474E-15 1.099044305757672E-14 2.379841706386895E-12 -7.271929981838496E-14 7.212100649928593E-13 5.097057077403431E-15 tp -9.628999383947453E-13 2.379841706386895E-12 2.946248953818588E-9 -5.983447321797064E-12 8.385387819589583E-10 2.436787577451502E-12 node 3.218656599152407E-14 -7.271929981838496E-14 -5.983447321797064E-12 3.978176558688792E-9 -3.964914596230226E-9 -9.159530730435677E-11 peri -2.950040723510932E-13 7.212100649928593E-13 8.385387819589583E-10 -3.964914596230226E-9 4.197917434262883E-9 9.197699190417628E-11 i -2.193580577661381E-15 5.097057077403431E-15 2.436787577451502E-12 -9.159530730435677E-11 9.197699190417628E-11 1.87153606370705E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.0   n/a MPO309817   90976 (1997 WH38)          Discovered 1997-Nov-29 by LINEAR at Socorro Reference: 20041028/Numbers.arc Last Updated: 2004-10-29 [ show close-approach data ] Alternate Designations  1997 WH38 = 2000 QA227  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-28 02:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin