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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1470732433363588 7.0086e-08  
a 5.206371313690866 1.1809e-07 au
q 4.440653398572971 4.2941e-07 au
i 21.0337626921913 7.0022e-06 deg
node 45.35293322621115 1.5908e-05 deg
peri 5.46057155849461 2.6413e-05 deg
M 292.676054160326 2.5249e-05 deg
tp 2459811.962015988305
(2022-Aug-20.46201599)
0.00032181 TDB
period 4339.114740117321
11.88
0.00014763
4.042e-07
d
yr
n .0829662319531717 2.8227e-09 deg/d
Q 5.972089228808761 1.3546e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1081  
   data-arc span      13212 days (36.17 yr)  
   first obs. used      1984-08-21  
   last obs. used      2020-10-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53968  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:02:53  

Additional Information
 Earth MOID = 3.45168 au 
 Jupiter MOID = .528059 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 11.0   n/a MPO492967  
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. 2019-August); 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 ]
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