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21826 Youjiazhong (1999 TJ91)
Classification: Main-belt Asteroid          SPK-ID: 2021826
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1570114321577764 3.2102e-08  
a 2.259781627593729 7.6723e-09 au
q 1.904970077881407 7.196e-08 au
i 1.772715243260405 3.7542e-06 deg
node 66.85891581620857 0.00011972 deg
peri 254.0607975484091 0.00012044 deg
M 124.1864440534285 1.4605e-05 deg
tp 2458772.474317975775
(2019-Oct-15.97431798)
4.9688e-05 TDB
period 1240.789578147735
3.40
6.319e-06
1.73e-08
d
yr
n .2901378334732727 1.4776e-09 deg/d
Q 2.614593177306052 8.8769e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1240  
   data-arc span      10925 days (29.91 yr)  
   first obs. used      1991-02-21  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5281  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:35  

Additional Information
 Earth MOID = .891136 au 
 Jupiter MOID = 2.67465 au 
 T_jup = 3.604 
[ 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 15.4   n/a MPO337442  

21826 Youjiazhong           Discovered 1999 Oct. 2 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
YouJia Zhong (b. 1987) was awarded second place in the 2005 Intel International Science and Engineering Fair for her chemistry project. She attends the Raffles Junior College, Singapore, Singapore.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

[ show close-approach data ]
Alternate Designations
 1999 TJ91 = 1998 FZ50 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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