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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1560457220623483 5.0676e-08  
a 2.248504292138349 1.6888e-08 au
q 1.897634816311331 1.179e-07 au
i 1.636467436727686 6.4049e-06 deg
node 278.4573735288873 0.00020639 deg
peri 307.8329189857576 0.00020805 deg
M 252.9111593926638 2.6887e-05 deg
tp 2459566.836949077519
(2021-Dec-18.33694908)
9.4661e-05 TDB
period 1231.513021524599
3.37
1.3875e-05
3.799e-08
d
yr
n .292323340239086 3.2934e-09 deg/d
Q 2.599373767965367 1.9524e-08 au
  Orbit Determination Parameters
   # obs. used (total)      123  
   data-arc span      5177 days (14.17 yr)  
   first obs. used      2006-11-16  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55007  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 17:42:51  

Additional Information
 Earth MOID = .887379 au 
 Jupiter MOID = 2.3856 au 
 T_jup = 3.612 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457679.5 (2016-Oct-18.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .156162273527486 5.072e-08  
q 1.897255305126929 1.1798e-07 au
tp 2457104.667149977613
(2015-Mar-23.16714998)
7.9021e-05 TDB
node 278.4842180565147 0.00020657 deg
peri 307.9306277346289 0.00020822 deg
i 1.635565337172268 6.4031e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      123  
   data-arc span      5177 days (14.17 yr)  
   first obs. used      2006-11-16  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55007  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 17:42:51  

Additional Information
 Jupiter MOID = 2.3856 au 
 T_jup = 3.612 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.572554963541973E-15 -5.942719613332289E-15 -2.701731836630429E-13 -5.429953968265905E-15 -7.478877346428275E-14 -1.0620752632599E-15
q -5.942719613332289E-15 1.392039986806045E-14 1.09894652440387E-12 7.935151131345613E-15 3.482244459133488E-13 2.626302426896196E-15
tp -2.701731836630429E-13 1.09894652440387E-12 6.244283592576313E-9 -2.047640421797485E-11 2.090034172501702E-9 1.376915634965406E-12
node -5.429953968265905E-15 7.935151131345613E-15 -2.047640421797485E-11 4.267155308061526E-8 -4.266119743831909E-8 2.142117022750654E-10
peri -7.478877346428275E-14 3.482244459133488E-13 2.090034172501702E-9 -4.266119743831909E-8 4.335694940767468E-8 -2.136647671025819E-10
i -1.0620752632599E-15 2.626302426896196E-15 1.376915634965406E-12 2.142117022750654E-10 -2.136647671025819E-10 4.099909312965898E-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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