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20689 Zhuyuanchen (1999 VF63)
Classification: Main-belt Asteroid          SPK-ID: 2020689
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1440058903143514 3.3464e-08  
a 2.763447002235111 1.126e-08 au
q 2.365494356341718 9.1798e-08 au
i 9.712846399939362 4.4542e-06 deg
node 43.68235861378062 2.01e-05 deg
peri 31.54479944834628 2.4685e-05 deg
M 190.6312782177394 1.5066e-05 deg
tp 2459989.915857506306
(2023-Feb-14.41585751)
7.2175e-05 TDB
period 1677.935014870235
4.59
1.0255e-05
2.808e-08
d
yr
n .2145494293936294 1.3113e-09 deg/d
Q 3.161399648128503 1.2881e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1752  
   data-arc span      10313 days (28.24 yr)  
   first obs. used      1992-04-26  
   last obs. used      2020-07-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47075  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:27:10  

Additional Information
 Earth MOID = 1.38539 au 
 Jupiter MOID = 2.16712 au 
 T_jup = 3.305 
[ 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 13.86   n/a E2021B10  
diameter diameter 4.236 km 0.240 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.326   0.062 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20689 Zhuyuanchen           Discovered 1999 Nov. 4 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Zhu Yuanchen (b. 1985) was awarded first place and Best in Category in the 2004 Intel International Science and Engineering Fair for his computer science project. He also received the Intel Foundation Young Scientist Award and the Seaborg SIYSS Award. He attends the Shanghai Foreign Language School, Shanghai, China.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041226/MPCPages.arcLast Updated: 2004-12-25
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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