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

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01894124284511348 4.0401e-08  
a 2.692099604050722 1.2478e-08 au
q 2.641107891687164 1.1122e-07 au
i 2.513811234575726 4.0761e-06 deg
node 252.7971920622119 0.00010609 deg
peri 352.0348221979738 0.00016172 deg
M 335.3677237810988 0.00012234 deg
tp 2459310.891887311830
(2021-Apr-06.39188731)
0.00054828 TDB
period 1613.37422003104
4.42
1.1217e-05
3.071e-08
d
yr
n .2231348409627333 1.5514e-09 deg/d
Q 2.743091316414281 1.2715e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1160  
   data-arc span      9090 days (24.89 yr)  
   first obs. used      1995-07-02  
   last obs. used      2020-05-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52064  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:13:46  

Additional Information
 Earth MOID = 1.62558 au 
 Jupiter MOID = 2.23679 au 
 T_jup = 3.370 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.01   n/a E2021B10  

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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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