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(2021 HJ2)
Classification: Apollo [NEO]          SPK-ID: 54139314
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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2439858118947941 5.2827e-05  
a 1.141401857286454 5.0176e-05 au
q .8629159984381928 2.2394e-05 au
i 10.44103953144989 0.0019474 deg
node 53.74737243839353 0.00042573 deg
peri 264.0485153052226 0.0013448 deg
M 181.2981921750033 0.014896 deg
tp 2459421.596941292045
(2021-Jul-26.09694129)
0.0038651 TDB
period 445.4062319452506
1.22
0.02937
8.041e-05
d
yr
n .8082509273113432 5.3296e-05 deg/d
Q 1.419887716134715 6.2418e-05 au
  Orbit Determination Parameters
   # obs. used (total)      88  
   data-arc span      30 days  
   first obs. used      2021-04-07  
   last obs. used      2021-05-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      6  
   norm. resid. RMS      .43804  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-08 05:50:49  

Additional Information
 Earth MOID = .020505 au 
 Jupiter MOID = 3.84861 au 
 T_jup = 5.452 
[ 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 23.57   .42651 E2021J33 autocmod 2.9c

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