Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
JPL Small-Body Database Browser
Search: [ help ]  
18639 Aoyunzhiyuanzhe (1998 ER8)
Classification: Main-belt Asteroid          SPK-ID: 2018639
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]
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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01980423207190727 6.3704e-08  
a 2.694228047054834 2.7939e-08 au
q 2.640870929556319 1.6589e-07 au
i 2.512018110595818 6.5436e-06 deg
node 252.8632641081486 0.00015533 deg
peri 347.9194097461775 0.00024685 deg
M 297.9815707113321 0.00018908 deg
tp 2457678.771172704843
0.00084722 JED
period 1615.28796073602
n .222870478051457 3.4667e-09 deg/d
Q 2.747585164553349 2.8492e-08 au
  Orbit Determination Parameters
   # obs. used (total)      676  
   data-arc span      7473 days (20.46 yr)  
   first obs. used      1995-07-02  
   last obs. used      2015-12-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55004  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:40:19  

Additional Information
 Earth MOID = 1.62646 au 
 Jupiter MOID = 2.23159 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-Feb-10 12:53 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin