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(2009 HF21)
Classification: Apollo [NEO]          SPK-ID: 3457845
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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5706513574811058 0.00051111  
a 2.337488943910638 0.0025524 au
q 1.003597704970956 9.8857e-05 au
i 4.270443216030635 0.0024737 deg
node 34.71422567433203 0.0010595 deg
peri 188.7244981157075 0.0017037 deg
M 90.37824547903718 1.945 deg
tp 2458872.794160528821
(2020-Jan-24.29416053)
6.5157 TDB
period 1305.33738052027
3.57
2.138
0.005854
d
yr
n .2757907690167535 0.00045171 deg/d
Q 3.67138018285032 0.0040089 au
  Orbit Determination Parameters
   # obs. used (total)      48  
   data-arc span      2 days  
   first obs. used      2009-04-20  
   last obs. used      2009-04-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      7  
   norm. resid. RMS      .41568  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 02:42:37  

Additional Information
 Earth MOID = .000564075 au 
 Jupiter MOID = 1.3185 au 
 T_jup = 3.324 
[ 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 26.2   n/a MPO159817  

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