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21599 (1998 WA15)
Classification: Jupiter Trojan          SPK-ID: 2021599
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .117202217063657 5.448e-08  
a 5.206169399288233 9.8778e-08 au
q 4.595994803282684 3.5107e-07 au
i 11.20490821166638 5.1964e-06 deg
node 218.8269136964337 2.6489e-05 deg
peri 210.6586984892716 3.9321e-05 deg
M 301.1455861701705 3.256e-05 deg
tp 2459909.836662932818
(2022-Nov-26.33666293)
0.00040528 TDB
period 4338.862322104858
11.88
0.00012348
3.381e-07
d
yr
n .08297105860352759 2.3614e-09 deg/d
Q 5.816343995293781 1.1036e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1279  
   data-arc span      11304 days (30.95 yr)  
   first obs. used      1990-03-02  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49107  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:49:55  

Additional Information
 Earth MOID = 3.61504 au 
 Jupiter MOID = .296117 au 
 T_jup = 2.948 
[ 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 11.4   n/a MPO416936  
diameter diameter 28.312 km 1.042 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 12.651 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:
[Szabo, Gy.M.; Pal, A.; Kiss, Cs.; Kiss, L.L.; et al. (2017) Astron. Astrophys. 599, A44.]
geometric albedo albedo 0.067   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

21599 (1998 WA15)          Discovered 1998-Nov-21 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 WA15 = 1990 EX 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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