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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 ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


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 
[ show covariance matrix ]

[ 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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