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420210 (2011 HF)
Classification: Apollo [NEO, PHA]          SPK-ID: 2420210
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | 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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 69 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2346410506605061 4.3438e-08  
a 1.283549683709829 6.9779e-09 au
q .9823762373491942 5.4074e-08 au
i 10.62174656048703 5.3403e-06 deg
node 204.8934418524268 1.7893e-05 deg
peri 149.6444243485158 1.9537e-05 deg
M 98.24454260601901 1.3635e-05 deg
tp 2459055.548275282983
(2020-Jul-25.04827528)
1.9154e-05 TDB
period 531.1503266638346
1.45
4.3313e-06
1.186e-08
d
yr
n .6777742230926731 5.527e-09 deg/d
Q 1.584723130070463 8.6153e-09 au
  Orbit Determination Parameters
   # obs. used (total)      196  
   data-arc span      3607 days (9.88 yr)  
   first obs. used      2011-04-22  
   last obs. used      2021-03-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56453  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-08 05:19:43  

Additional Information
 Earth MOID = .0100654 au 
 Jupiter MOID = 3.86994 au 
 T_jup = 5.003 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 20.4   n/a E2014M17  

420210 (2011 HF)          Discovered 2011-Apr-22 by Spacewatch at Kitt Peak
Reference: Last Updated: 2015-01-07

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