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(2021 HH)
Classification: Apollo [NEO]          SPK-ID: 54138313
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ hide orbit diagram ]

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 2459323.5 (2021-Apr-19.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5359112005170353 0.0012237  
a 1.443732041990056 0.0028066 au
q .6700198701422542 0.00046422 au
i 9.143519545811582 0.022112 deg
node 206.0966597618269 0.0020039 deg
peri 100.6208033815162 0.0087103 deg
M 323.4474887544164 0.13617 deg
tp 2459387.834367915708
(2021-Jun-22.33436792)
0.052074 TDB
period 633.6191867652657
1.73
1.8476
0.005058
d
yr
n .568164612940245 0.0016568 deg/d
Q 2.217444213837858 0.0043107 au
  Orbit Determination Parameters
   # obs. used (total)      52  
   data-arc span      13 days  
   first obs. used      2021-04-16  
   last obs. used      2021-04-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      8  
   norm. resid. RMS      .28178  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-30 06:19:57  

Additional Information
 Earth MOID = .0180953 au 
 Jupiter MOID = 3.11477 au 
 T_jup = 4.482 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 1.497497324652077E-6 -5.680799896449767E-7 -6.372420451510312E-5 2.452066730037559E-6 -1.065854022688929E-5 2.705841838583871E-5
q -5.680799896449767E-7 2.15503050738449E-7 2.417395193584516E-5 -9.301999173949082E-7 4.043310799145617E-6 -1.026469579453437E-5
tp -6.372420451510312E-5 2.417395193584516E-5 .002711707799808158 -.0001043446433862844 .0004535631761659673 -.001151437983447778
node 2.452066730037559E-6 -9.301999173949082E-7 -.0001043446433862844 4.015588359833306E-6 -1.745297269860557E-5 4.430738786311101E-5
peri -1.065854022688929E-5 4.043310799145617E-6 .0004535631761659673 -1.745297269860557E-5 7.586908162846313E-5 -.0001925897536204554
i 2.705841838583871E-5 -1.026469579453437E-5 -.001151437983447778 4.430738786311101E-5 -.0001925897536204554 .0004889235326983424

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 25.09   .35418 E2021-HE8 autocmod 2.9c

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