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18639 Aoyunzhiyuanzhe (1998 ER8)
Classification: Main-belt Asteroid          SPK-ID: 2018639
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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 2-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 has stopped working because of a recent Java upgrade, here is a possible workaround.
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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01931983305834221 5.7839e-08  
a 2.692814772729001 2.2789e-08 au
q 2.64079004086284 1.5599e-07 au
i 2.513200409488109 5.7211e-06 deg
node 252.820031275082 0.00015116 deg
peri 348.6863384719201 0.00024731 deg
M 341.8338059893782 0.00019241 deg
tp 2457681.945969230126
0.00086217 JED
period 1614.017163182415
n .223045955279791 2.8315e-09 deg/d
Q 2.744839504595163 2.323e-08 au
  Orbit Determination Parameters
   # obs. used (total)      770  
   data-arc span      7590 days (20.78 yr)  
   first obs. used      1995-07-02  
   last obs. used      2016-04-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5323  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:30:25  

Additional Information
 Earth MOID = 1.62719 au 
 Jupiter MOID = 2.23497 au 
 T_jup = 3.369 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.9 mag n/a MPO267777  

18639 Aoyunzhiyuanzhe           Discovered 1998 Mar. 5 by the Beijing Schmidt CCD Asteroid Program at Xinglong.
Aoyunzhiyuanzhe, meaning "Olympic Games Volunteer", honors the 1.7 million volunteers whose work, devotion, smiles and service during the 2008 Olympic and Paralympic Games touched the whole world, setting a milestone in voluntary service and opening a fresh chapter in volunteerism in China.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20081212/MPCPages.arcLast Updated: 2008-12-12

[ show close-approach data ]
Alternate Designations
 1998 ER8 = 1996 XJ16 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-May-03 10:36 UT
(server date/time)  
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