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21989 Werntz (1999 XU20)
Classification: Main-belt Asteroid          SPK-ID: 2021989
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1715012505309868 3.5919e-08  
a 3.122898178523334 1.8968e-08 au
q 2.587317235625642 1.1587e-07 au
i 3.825838930861222 4.2753e-06 deg
node 188.3922236829753 6.6012e-05 deg
peri 249.6671317703543 6.7913e-05 deg
M 306.7938785686347 1.9393e-05 deg
tp 2459694.416298895815
(2022-Apr-24.91629890)
0.00011001 TDB
period 2015.743014473311
5.52
1.8365e-05
5.028e-08
d
yr
n .1785941945055251 1.6271e-09 deg/d
Q 3.658479121421026 2.2221e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1211  
   data-arc span      15723 days (43.05 yr)  
   first obs. used      1977-10-18  
   last obs. used      2020-11-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52297  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:57:07  

Additional Information
 Earth MOID = 1.60573 au 
 Jupiter MOID = 1.62786 au 
 T_jup = 3.189 
[ 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 13.95   n/a E2021B10  
diameter diameter 4.109 km 0.461 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.211   0.079 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21989 Werntz           Discovered 1999 Dec. 5 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Ruslan Alan Werntz (b. 1989) is a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for his biochemistry, medicine, health, & microbiology project. He attends the Coppell Middle School West, Coppell, Texas.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20051019/MPCPages.arcLast Updated: 2005-10-26

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Alternate Designations
 1999 XU20 = 1977 UA5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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