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JPL Small-Body Database Browser
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38574 (1999 WS4)
Classification: Jupiter Trojan          SPK-ID: 2038574
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1044901545857624 5.6944e-08  
a 5.144083085380164 1.1508e-07 au
q 4.606577048586785 3.1714e-07 au
i 7.194927927593795 6.8384e-06 deg
node 300.8764874776088 3.9783e-05 deg
peri 170.4751299152931 5.0644e-05 deg
M 208.2213285549212 3.448e-05 deg
tp 2460397.171318584546
(2024-Mar-27.67131858)
0.00045248 TDB
period 4261.479353668492
11.67
0.000143
3.915e-07
d
yr
n .08447770600838279 2.8347e-09 deg/d
Q 5.681589122173542 1.271e-07 au
  Orbit Determination Parameters
   # obs. used (total)      750  
   data-arc span      7622 days (20.87 yr)  
   first obs. used      1998-11-11  
   last obs. used      2019-09-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53033  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 05:46:06  

Additional Information
 Earth MOID = 3.6237 au 
 Jupiter MOID = .519931 au 
 T_jup = 2.974 
[ 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 11.7   n/a MPO279908  
diameter diameter 17.296 km 2.688 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 7.085 h n/a LCDB (Rev. 2019-January); 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:
[Ryan, E.L.; Sharkey, B.N.L.; Woodward, C.E. (2017) Astron. J. 153, A116.]
[Szabo, Gy.M.; Pal, A.; Kiss, Cs.; Kiss, L.L.; et al. (2017) Astron. Astrophys. 599, A44.]
geometric albedo albedo 0.135   0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

38574 (1999 WS4)          Discovered 1999-Nov-28 by Kobayashi, T. at Oizumi
Reference: 20020328/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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