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(2018 XR4)
Classification: Apollo [NEO]          SPK-ID: 3836905
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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 2 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3572348224220639 0.00056819  
a 1.143868487758622 0.00061376 au
q .7352388316599763 0.00027053 au
i 10.21259056929246 0.016041 deg
node 84.45050743418015 0.0012253 deg
peri 88.40044370036199 0.017165 deg
M 179.8772929713778 0.4082 deg
tp 2458977.226894508506
(2020-May-07.72689451)
0.32698 TDB
period 446.8508317485503
1.22
0.35965
0.0009847
d
yr
n .8056379767523348 0.00064842 deg/d
Q 1.552498143857269 0.00083302 au
  Orbit Determination Parameters
   # obs. used (total)      27  
   data-arc span      1 day  
   first obs. used      2018-12-14  
   last obs. used      2018-12-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      7  
   norm. resid. RMS      .46445  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 20:56:07  

Additional Information
 Earth MOID = .00180376 au 
 Jupiter MOID = 3.43857 au 
 T_jup = 5.411 
[ 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 26.8   .30098 E2018Y12 autocmod 2.6q

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