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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 66 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2346946942494592 4.5871e-08  
a 1.283599380841882 9.9442e-09 au
q .9823454166164015 5.8103e-08 au
i 10.62161036192948 6.1694e-06 deg
node 204.8967057821436 1.9569e-05 deg
peri 149.6236299954799 2.1378e-05 deg
M 322.7021481558969 1.4935e-05 deg
tp 2459055.533102130648
(2020-Jul-25.03310213)
2.2565e-05 TDB
period 531.1811749867716
1.45
6.1727e-06
1.69e-08
d
yr
n .6777348613850356 7.8758e-09 deg/d
Q 1.584853345067363 1.2278e-08 au
  Orbit Determination Parameters
   # obs. used (total)      186  
   data-arc span      2436 days (6.67 yr)  
   first obs. used      2011-04-22  
   last obs. used      2017-12-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50241  
   source      ORB  
   producer      Otto Matic  
   solution date      2017-Dec-23 06:25:59  

Additional Information
 Earth MOID = .0111226 au 
 Jupiter MOID = 3.86923 au 
 T_jup = 5.003 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456850.5 (2014-Jul-12.0) TDB
Reference: JPL 66 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2346644187132152 4.5719e-08  
q .9821710057645963 5.8147e-08 au
tp 2456930.602465372772
(2014-Sep-30.10246537)
1.4004e-05 TDB
node 204.9389997897487 1.9572e-05 deg
peri 149.5340737706742 2.14e-05 deg
i 10.62138861521418 6.1691e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      186  
   data-arc span      2436 days (6.67 yr)  
   first obs. used      2011-04-22  
   last obs. used      2017-12-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50241  
   source      ORB  
   producer      Otto Matic  
   solution date      2017-Dec-23 06:25:59  

Additional Information
 Jupiter MOID = 3.86923 au 
 T_jup = 5.003 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.090192910395863E-15 -2.635612100006043E-15 6.153763610758947E-14 3.229538022643951E-13 -1.647228179061478E-13 -3.566275808184531E-14
q -2.635612100006043E-15 3.381037258066335E-15 -1.248871746945571E-13 -4.244811092817646E-13 1.844343913624461E-13 3.017227498963931E-14
tp 6.153763610758947E-14 -1.248871746945571E-13 1.961029580076073E-10 -7.381140162609572E-12 1.624681051404488E-10 1.572588702299498E-11
node 3.229538022643951E-13 -4.244811092817646E-13 -7.381140162609572E-12 3.830751075423164E-10 -3.479893095963396E-10 3.146048135138795E-11
peri -1.647228179061478E-13 1.844343913624461E-13 1.624681051404488E-10 -3.479893095963396E-10 4.579761406553669E-10 -2.117121841673178E-11
i -3.566275808184531E-14 3.017227498963931E-14 1.572588702299498E-11 3.146048135138795E-11 -2.117121841673178E-11 3.805734991789886E-11

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

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