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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2458852.5 (2020-Jan-04.0) TDB
Reference: JPL 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4458344321584574 4.8293e-07  
q .8796658840912519 7.638e-07 au
tp 2458515.350283999293
(2019-Jan-31.85028400)
0.00026921 TDB
node 264.3067407849694 6.693e-05 deg
peri 237.7886161047619 0.00034291 deg
i 2.997355368394084 6.725e-05 deg
  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
 Jupiter MOID = 2.74242 au 
 T_jup = 4.266 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.332216912401144E-13 -3.688587323276443E-13 9.554854987697558E-11 -1.154734041562135E-11 1.324567525972744E-10 1.819827111617956E-11
q -3.688587323276443E-13 5.833937298230538E-13 -1.505847407972658E-10 1.81435998343042E-11 -2.088934720832054E-10 -2.863030304758142E-11
tp 9.554854987697558E-11 -1.505847407972658E-10 7.247314912641809E-8 -1.139980670376253E-8 9.067299493038345E-8 1.649837788828296E-8
node -1.154734041562135E-11 1.81435998343042E-11 -1.139980670376253E-8 4.479676685039677E-9 -1.642256353378738E-8 -3.857044130240469E-9
peri 1.324567525972744E-10 -2.088934720832054E-10 9.067299493038345E-8 -1.642256353378738E-8 1.175859451602723E-7 2.136357725112973E-8
i 1.819827111617956E-11 -2.863030304758142E-11 1.649837788828296E-8 -3.857044130240469E-9 2.136357725112973E-8 4.522565515435549E-9

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 ]
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