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JPL Small-Body Database Browser
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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2444270635034566 2.4185e-05  
a 1.142297117049568 2.3433e-05 au
q .8630887870806775 9.9262e-06 au
i 10.425958925828 0.00092838 deg
node 53.71649625386465 0.00015262 deg
peri 263.9273550393146 0.00057805 deg
M 339.8483104957477 0.001934 deg
tp 2459421.461806376776
(2021-Jul-25.96180638)
0.0016277 TDB
period 445.9303669671603
1.22
0.013721
3.757e-05
d
yr
n .8073009300721418 2.4841e-05 deg/d
Q 1.421505447018458 2.916e-05 au
  Orbit Determination Parameters
   # obs. used (total)      157  
   data-arc span      46 days  
   first obs. used      2021-04-07  
   last obs. used      2021-05-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      5  
   norm. resid. RMS      .41968  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-29 05:50:33  

Additional Information
 Earth MOID = .0214982 au 
 Jupiter MOID = 3.84565 au 
 T_jup = 5.449 
[ 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 23.34   .42651 MPO622791 autocmod 2.9c

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