+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   187447 (2005 WD117) Classification: Main-belt Asteroid          SPK-ID: 2187447 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .216925943286677 5.9353e-08   a 2.711091553762325 2.2733e-08 au q 2.12298546112589 1.6376e-07 au i 15.02407625585641 5.3315e-06 deg node 87.9826956518353 2.4683e-05 deg peri 231.7195007147512 2.8902e-05 deg M 214.4026989461873 1.7618e-05 deg tp 2459859.925180043231 (2022-Oct-07.42518004) 8.1468e-05 TDB period 1630.477097427944 4.46 2.0508e-05 5.615e-08 d yr n .2207942697066369 2.7771e-09 deg/d Q 3.299197646398761 2.7665e-08 au   Orbit Determination Parameters    # obs. used (total)      473      data-arc span      8845 days (24.22 yr)      first obs. used      1996-12-05      last obs. used      2021-02-22      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .61237      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 21:55:27   Additional Information  Earth MOID = 1.14093 au   Jupiter MOID = 2.0738 au   T_jup = 3.280  [ 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 15.67   n/a E2021B55   187447 (2005 WD117)          Discovered 2005-Nov-29 by Reddy, V. at Goodricke-Pigott Reference: 20080520/Numbers.arc Last Updated: 2008-05-22 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-17 18:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin