Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1716087865143966 3.6069e-08  
a 3.125768066206235 1.9551e-08 au
q 2.589358801439131 1.1635e-07 au
i 3.82296280142072 4.3652e-06 deg
node 188.4119042901441 6.6738e-05 deg
peri 249.3536659482659 6.8655e-05 deg
M 272.1078749721179 1.9316e-05 deg
tp 2459693.311706694236
(2022-Apr-23.81170669)
0.00011069 TDB
period 2018.522300531979
5.53
1.8939e-05
5.185e-08
d
yr
n .1783482896895033 1.6733e-09 deg/d
Q 3.662177330973339 2.2907e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1204  
   data-arc span      15723 days (43.05 yr)  
   first obs. used      1977-10-18  
   last obs. used      2020-11-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5237  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:18:35  

Additional Information
 Earth MOID = 1.60742 au 
 Jupiter MOID = 1.62486 au 
 T_jup = 3.188 
[ 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

[ show close-approach data ]
Alternate Designations
 1999 XU20 = 1977 UA5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-13 05:48 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin