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441371 (2008 EH21)
Classification: Main-belt Asteroid          SPK-ID: 2441371
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ 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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1562226610618339 5.9137e-08  
a 2.248167693718079 1.7477e-08 au
q 1.896952954092195 1.3446e-07 au
i 1.636607088074806 6.4092e-06 deg
node 278.4552990976854 0.00024875 deg
peri 307.8519849896779 0.00025051 deg
M 194.4314969692416 2.8009e-05 deg
tp 2459566.761066169367
(2021-Dec-18.26106617)		 9.9153e-05 TDB
period 1231.236497820489
3.37		 1.4357e-05
3.931e-08		 d
yr
n .2923889932090747 3.4096e-09 deg/d
Q 2.599382433343964 2.0208e-08 au
   Orbit Determination Parameters
   # obs. used (total)      96  
   data-arc span      4702 days (12.87 yr)  
   first obs. used      2006-11-16  
   last obs. used      2019-10-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55476  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-08 15:56:48  

Additional Information
 Earth MOID = .88791 au 
 Jupiter MOID = 2.38677 au 
 T_jup = 3.612 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457304.5 (2015-Oct-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1560175140271956 5.9163e-08  
q 1.8975115161425 1.3447e-07 au
tp 2457104.487389911536
(2015-Mar-22.98738991)		 8.7611e-05 TDB
node 278.504720399591 0.00024894 deg
peri 307.8740873371441 0.00025071 deg
i 1.635685322485527 6.4076e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      96  
   data-arc span      4702 days (12.87 yr)  
   first obs. used      2006-11-16  
   last obs. used      2019-10-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55476  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-08 15:56:48  

Additional Information
 Jupiter MOID = 2.38677 au 
 T_jup = 3.612 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.500213531454505E-15 -7.90758718202997E-15 -1.419650995778284E-12 -5.039410008288862E-15 -5.19642416454033E-13 -1.558227462231442E-15
q -7.90758718202997E-15 1.808228924550523E-14 3.539746065103794E-12 6.456228800674021E-15 1.293472632321189E-12 3.689809902780065E-15
tp -1.419650995778284E-12 3.539746065103794E-12 7.675750195631858E-9 -2.192999095424765E-11 2.644593939194732E-9 1.979761420805919E-12
node -5.039410008288862E-15 6.456228800674021E-15 -2.192999095424765E-11 6.197126413824033E-8 -6.195344501446253E-8 2.001958759263672E-10
peri -5.19642416454033E-13 1.293472632321189E-12 2.644593939194732E-9 -6.195344501446253E-8 6.285550874240906E-8 -1.994216992751254E-10
i -1.558227462231442E-15 3.689809902780065E-15 1.979761420805919E-12 2.001958759263672E-10 -1.994216992751254E-10 4.10576920720562E-11

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.9   n/a MPO437716  

441371 (2008 EH21)          Discovered 2008-Mar-02 by Spacewatch at Kitt Peak
Reference: Last Updated: 2015-09-02
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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