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(2021 HD)
Classification: Aten [NEO]          SPK-ID: 54138304
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 2 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3274933727502186 0.00035722  
a .913746075448383 4.746e-05 au
q .6145002913625164 0.00029563 au
i 14.07826466287669 0.019758 deg
node 208.383072936108 0.001536 deg
peri 127.6380832658223 0.0077929 deg
M 348.2826605561192 0.046705 deg
tp 2459406.883965210706
(2021-Jul-11.38396521)
0.040601 TDB
period 319.0338125611359
0.87
0.024856
6.805e-05
d
yr
n 1.128407039711547 8.7914e-05 deg/d
Q 1.21299185953425 6.3003e-05 au
  Orbit Determination Parameters
   # obs. used (total)      22  
   data-arc span      4 days  
   first obs. used      2021-04-16  
   last obs. used      2021-04-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      6  
   norm. resid. RMS      .34467  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-20 06:22:11  

Additional Information
 Earth MOID = .00917183 au 
 Jupiter MOID = 4.18144 au 
 T_jup = 6.463 
[ 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 26.27   .36199 E2021-HA0 autocmod 2.9c

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