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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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2459334.5 (2021-Apr-30.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2440718318225152 2.4232e-05  
q .8627712266439388 9.8519e-06 au
tp 2459421.591081268218
(2021-Jul-26.09108127)
0.0016672 TDB
node 53.7410140522595 0.00015899 deg
peri 264.0647450340373 0.0006185 deg
i 10.44217838090914 0.00092573 deg
  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
 Jupiter MOID = 3.84565 au 
 T_jup = 5.449 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.871770987338632E-10 -2.386480201740772E-10 -4.037768575149771E-8 -3.845008914651156E-9 -1.485414101882838E-8 2.242997048693187E-8
q -2.386480201740772E-10 9.706064678879268E-11 1.63972716463609E-8 1.563867157075818E-9 6.016508409625076E-9 -9.117786577150609E-9
tp -4.037768575149771E-8 1.63972716463609E-8 2.77958582821063E-6 2.641124757923162E-7 1.025914037955462E-6 -1.541996285927146E-6
node -3.845008914651156E-9 1.563867157075818E-9 2.641124757923162E-7 2.527887296170217E-8 9.679144791404848E-8 -1.469664294311968E-7
peri -1.485414101882838E-8 6.016508409625076E-9 1.025914037955462E-6 9.679144791404848E-8 3.825375496383166E-7 -5.668074075433375E-7
i 2.242997048693187E-8 -9.117786577150609E-9 -1.541996285927146E-6 -1.469664294311968E-7 -5.668074075433375E-7 8.569733658723272E-7

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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