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(2021 HH1)
Classification: Apollo [NEO]          SPK-ID: 54138715
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 2459326.5 (2021-Apr-22.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .432815014915342 0.0014397  
a 1.360043026814658 0.0027356 au
q .7713959838783652 0.00040647 au
i 13.99801018141297 0.034479 deg
node 49.40410556914146 0.0063646 deg
peri 248.3904543044609 0.030268 deg
M 321.7440228381678 0.15741 deg
tp 2459388.063626930848
(2021-Jun-22.56362693)
0.067574 TDB
period 579.3318414361951
1.59
1.7479
0.004785
d
yr
n .621405512784418 0.0018748 deg/d
Q 1.948690069750952 0.0039196 au
  Orbit Determination Parameters
   # obs. used (total)      75  
   data-arc span      13 days  
   first obs. used      2021-04-17  
   last obs. used      2021-04-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      8  
   norm. resid. RMS      .40178  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-30 06:19:58  

Additional Information
 Earth MOID = .0310808 au 
 Jupiter MOID = 3.33863 au 
 T_jup = 4.720 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 2.072736418819957E-6 -5.851853965340842E-7 -9.728655358994697E-5 9.161512940478213E-6 -4.357379301486535E-5 4.963917437866638E-5
q -5.851853965340842E-7 1.652142233261094E-7 2.746629346149662E-5 -2.586433822656326E-6 1.230156709910246E-5 -1.401446288130024E-5
tp -9.728655358994697E-5 2.746629346149662E-5 .00456628070046011 -.0004300141037179724 .00204522391212959 -.002329872263280366
node 9.161512940478213E-6 -2.586433822656326E-6 -.0004300141037179724 4.050765232706752E-5 -.0001926258574903404 .0002193948164364255
peri -4.357379301486535E-5 1.230156709910246E-5 .00204522391212959 -.0001926258574903404 .0009161261431322689 -.001043507007877727
i 4.963917437866638E-5 -1.401446288130024E-5 -.002329872263280366 .0002193948164364255 -.001043507007877727 .001188799053379001

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 23.38   .2785 E2021-HE8 autocmod 2.9c

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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