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(2018 XE4)
Classification: Apollo [NEO]          SPK-ID: 3836890
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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 26.57   .25724 E2020Y56 autocmod 2.6q

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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