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21827 Chingzhu (1999 TS91)
Classification: Main-belt Asteroid          SPK-ID: 2021827
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05108364541692781 4.0038e-08  
a 2.442872379841725 1.1794e-08 au
q 2.318081553391084 9.7969e-08 au
i 8.195369934268241 4.7329e-06 deg
node 135.2365026648137 3.0187e-05 deg
peri 87.28681000238105 5.4681e-05 deg
M 289.610299554737 4.6321e-05 deg
tp 2459273.181837530569
(2021-Feb-27.68183753)
0.00017967 TDB
period 1394.599790737014
3.82
1.0099e-05
2.765e-08
d
yr
n .2581385730810617 1.8693e-09 deg/d
Q 2.567663206292367 1.2396e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1081  
   data-arc span      10409 days (28.50 yr)  
   first obs. used      1991-08-06  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52285  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 23:31:48  

Additional Information
 Earth MOID = 1.32697 au 
 Jupiter MOID = 2.4289 au 
 T_jup = 3.485 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.0   n/a MPO319357  

21827 Chingzhu           Discovered 1999 Oct. 2 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Ching Zhu (b. 1987) was awarded second place in the 2005 Intel International Science and Engineering Fair for her biochemistry project. She attends the Academic Magnet High School, North Charleston, South Carolina, U.S.A.
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

Alternate Designations
 1999 TS91 = 1991 PH6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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