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21645 Chentsaiwei (1999 NZ50)
Classification: Main-belt Asteroid          SPK-ID: 2021645
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2142466642484322 6.2248e-08  
a 2.546226860013496 1.4239e-08 au
q 2.000706248835844 1.5475e-07 au
i 11.5968918515384 7.4033e-06 deg
node 289.8630661876877 3.1021e-05 deg
peri 62.28361448061408 3.7716e-05 deg
M 62.5412303385969 2.3115e-05 deg
tp 2458942.685114012276
(2020-Apr-03.18511401)
9.483e-05 TDB
period 1484.03474720742
4.06
1.2449e-05
3.408e-08
d
yr
n .2425819211291579 2.0349e-09 deg/d
Q 3.091747471191147 1.729e-08 au
  Orbit Determination Parameters
   # obs. used (total)      943  
   data-arc span      10802 days (29.57 yr)  
   first obs. used      1991-07-18  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44351  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:51:04  

Additional Information
 Earth MOID = 1.0218 au 
 Jupiter MOID = 2.42386 au 
 T_jup = 3.382 
[ 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 14.32   n/a E2021B10  
diameter diameter 4.013 km 0.726 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.275   0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21645 Chentsaiwei           Discovered 1999 July 14 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Chen Tsai Wei (b. 1989) was awarded first place and Best in Category in the 2006 Intel International Science and Engineering Fair for her chemistry project. She attends the Affiliated Senior High School of NKNU, Kaohsiung, Taiwan, Chinese Taipei.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060711/MPCPages.arcLast Updated: 2006-07-17

[ show close-approach data ]
Alternate Designations
 1999 NZ50 = 1991 OA2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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