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(2021 JH4)
Classification: Apollo [NEO]          SPK-ID: 54144919
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 .626702305301774 0.00040864  
a 2.63768929893951 0.0028465 au
q .9846433346242992 1.5278e-05 au
i 2.721606023440551 0.0012748 deg
node 41.48413223648232 0.0015891 deg
peri 209.4057004242766 0.0030416 deg
M 322.6228566147745 0.060648 deg
tp 2459362.956648263593
(2021-May-28.45664826)
0.00062496 TDB
period 1564.710089589435
4.28
2.5329
0.006935
d
yr
n .2300745693372889 0.00037243 deg/d
Q 4.290735263254722 0.0046304 au
  Orbit Determination Parameters
   # obs. used (total)      23  
   data-arc span      27 days  
   first obs. used      2021-04-15  
   last obs. used      2021-05-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      7  
   norm. resid. RMS      .53156  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-12 05:53:01  

Additional Information
 Earth MOID = .00658846 au 
 Jupiter MOID = .78661 au 
 T_jup = 3.081 
[ 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 25.585   .34473 2 autocmod 2.9c

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