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

Significant website upgrade scheduled for September 27. More details available here.

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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1715012506347029 3.5895e-08  
a 3.122898178743339 1.8826e-08 au
q 2.58731723548402 1.1585e-07 au
i 3.825838902402654 4.2738e-06 deg
node 188.392224809048 6.5761e-05 deg
peri 249.6671309043389 6.7637e-05 deg
M 306.7938782318193 1.9174e-05 deg
tp 2459694.416300813223
(2022-Apr-24.91630081)
0.00010875 TDB
period 2015.743014686321
5.52
1.8228e-05
4.991e-08
d
yr
n .1785941944866525 1.615e-09 deg/d
Q 3.658479122002658 2.2055e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1224  
   data-arc span      15997 days (43.80 yr)  
   first obs. used      1977-10-18  
   last obs. used      2021-08-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52147  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:46:58  

Additional Information
 Earth MOID = 1.60573 au 
 Jupiter MOID = 1.62786 au 
 T_jup = 3.189 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457422.5 (2016-Feb-04.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1743396756174292 3.6003e-08  
q 2.579103660571334 1.1698e-07 au
tp 2457653.756557876552
(2016-Sep-22.25655788)
9.4833e-05 TDB
node 189.4139352880198 6.5485e-05 deg
peri 245.4724950171772 6.7279e-05 deg
i 3.831782796908421 4.2723e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1224  
   data-arc span      15997 days (43.80 yr)  
   first obs. used      1977-10-18  
   last obs. used      2021-08-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52147  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:46:58  

Additional Information
 Jupiter MOID = 1.62786 au 
 T_jup = 3.189 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.296206350019619E-15 -4.172955625810595E-15 -3.276745427916824E-13 -9.414638171843981E-16 -8.546286048715422E-15 1.119540435724998E-15
q -4.172955625810595E-15 1.368462568585704E-14 1.864115231005149E-12 4.85643018953963E-15 1.497322051271039E-13 -3.615115785868035E-15
tp -3.276745427916824E-13 1.864115231005149E-12 8.993339661941636E-9 3.572763061071516E-12 1.490979392354277E-9 1.276740744835107E-12
node -9.414638171843981E-16 4.85643018953963E-15 3.572763061071516E-12 4.288334669923413E-9 -4.277491733937295E-9 -6.751854745546295E-11
peri -8.546286048715422E-15 1.497322051271039E-13 1.490979392354277E-9 -4.277491733937295E-9 4.526445160296652E-9 6.75888732033226E-11
i 1.119540435724998E-15 -3.615115785868035E-15 1.276740744835107E-12 -6.751854745546295E-11 6.75888732033226E-11 1.825281482910251E-11

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 13.96   n/a MPO636393  
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-Sep-23 04:17 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin