+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2017 WJ16) Classification: Aten [NEO]          SPK-ID: 3789720 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2120031906612777 1.3387e-08   a .8241514106537214 2.2294e-09 au q .6494286820071397 1.2103e-08 au i 5.774207472062676 7.735e-06 deg node 59.19252149081899 4.8137e-06 deg peri 187.0534003624321 2.086e-05 deg M 300.836054789546 3.2769e-05 deg tp 2459045.412120632818 (2020-Jul-14.91212063) 2.4812e-05 TDB period 273.2806842123442 0.75 1.1089e-06 3.036e-09 d yr n 1.317326912575619 5.3452e-09 deg/d Q .9988741393003032 2.702e-09 au   Orbit Determination Parameters    # obs. used (total)      151      # delay obs. used      2      # Doppler obs. used      0      data-arc span      1105 days (3.03 yr)      first obs. used      2017-11-25      last obs. used      2020-12-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40478      source      ORB      producer      Giorgini      solution date      2020-Dec-07 19:04:31   Additional Information  Earth MOID = .00852175 au   Jupiter MOID = 4.004 au   T_jup = 7.088  [ 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   n/a MPO435150   [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Jan-19 16:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin