+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   (2018 XE4) Classification: Apollo [NEO]          SPK-ID: 3836890 [ 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 6 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4459950491840534 4.8196e-07   a 1.587195192974303 9.8621e-09 au q .8793139948190357 7.6142e-07 au i 2.997269422111324 6.725e-05 deg node 264.3021717675096 6.6916e-05 deg peri 237.7954914905862 0.00034273 deg M 239.0972483771825 0.00013411 deg tp 2459245.788744561645 (2021-Jan-31.28874456) 0.00027416 TDB period 730.3716983851245 2.00 6.8073e-06 1.864e-08 d yr n .4928997122916614 4.594e-09 deg/d Q 2.295076391129571 1.4261e-08 au   Orbit Determination Parameters    # obs. used (total)      25      data-arc span      738 days (2.02 yr)      first obs. used      2018-12-12      last obs. used      2020-12-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .78914      source      ORB      producer      Otto Matic      solution date      2020-Dec-20 05:49:38   Additional Information  Earth MOID = .00774911 au   Jupiter MOID = 2.74242 au   T_jup = 4.266  [ 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 26.4   .25724 E2018-XC6 autocmod 2.6q [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Jan-28 16:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin