+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2018 WD) Classification: Apollo [NEO]          SPK-ID: 3836267 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5176961386198008 1.6244e-05   a 1.907056784709492 6.3096e-05 au q .9197808511366952 6.3264e-07 au i 16.76908289204017 0.00035235 deg node 61.3029979122952 1.0391e-05 deg peri 40.33319760513317 0.00014141 deg M 195.8193272529943 0.0095977 deg tp 2459439.195716855827 (2021-Aug-12.69571686) 0.047417 TDB period 961.9308742354872 2.63 0.047739 0.0001307 d yr n .374247266245734 1.8573e-05 deg/d Q 2.894332718282289 9.576e-05 au   Orbit Determination Parameters    # obs. used (total)      72      # delay obs. used      0      # Doppler obs. used      2      data-arc span      9 days      first obs. used      2018-11-16      last obs. used      2018-11-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      5      norm. resid. RMS      .31035      source      ORB      producer      Otto Matic      solution date      2020-Nov-16 08:24:16   Additional Information  Earth MOID = .0110193 au   Jupiter MOID = 2.41853 au   T_jup = 3.720  [ 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 24.3   .29321 E2018W53 autocmod 2.6q [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Jan-27 01:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin