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

[ hide orbit diagram ]

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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4462490100424427 4.7707e-07  
a 1.587705212350448 8.2132e-09 au
q .8791933330998342 7.5877e-07 au
i 2.997735700979167 6.7239e-05 deg
node 264.2992172611746 6.6825e-05 deg
peri 237.7949017878631 0.0003424 deg
M 337.6990346824481 0.00013526 deg
tp 2459245.766237134428
(2021-Jan-31.26623713)		 0.00027428 TDB
period 730.723766274299
2.00		 5.6701e-06
1.552e-08		 d
yr
n .4926622297171367 3.8228e-09 deg/d
Q 2.296217091601062 1.1878e-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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .78914  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 20:56:04  

Additional Information
 Earth MOID = .00768694 au 
 Jupiter MOID = 2.74071 au 
 T_jup = 4.265 
[ 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 MPO477910 autocmod 2.6q

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