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 ]  
20428 (1998 WG20)
Classification: Jupiter Trojan          SPK-ID: 2020428
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1472547919307145 6.9113e-08  
a 5.203749376033539 1.1677e-07 au
q 4.437472344406134 4.2675e-07 au
i 21.03673439515377 6.853e-06 deg
node 45.33145966850525 1.5886e-05 deg
peri 5.731811035324747 2.6357e-05 deg
M 309.0691429209344 2.5365e-05 deg
tp 2459813.910871179099
(2022-Aug-22.41087118)
0.0003186 TDB
period 4335.83737422011
11.87
0.00014595
3.996e-07
d
yr
n .0830289443373677 2.7948e-09 deg/d
Q 5.970026407660943 1.3397e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1166  
   data-arc span      13286 days (36.38 yr)  
   first obs. used      1984-08-21  
   last obs. used      2021-01-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52922  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:20:24  

Additional Information
 Earth MOID = 3.44776 au 
 Jupiter MOID = .523905 au 
 T_jup = 2.846 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.96   n/a E2021B10  
diameter diameter 27.176 km 3.231 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 14.813 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.095   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

20428 (1998 WG20)          Discovered 1998-Nov-18 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 WG20 = 1999 YY6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-21 15:30 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin