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19725 (1999 WT4)
Classification: Jupiter Trojan          SPK-ID: 2019725
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0735624125952884 2.784e-08  
a 5.15231750121421 8.7367e-08 au
q 4.773300595367965 2.0028e-07 au
i 9.956174287338584 2.341e-06 deg
node 43.2166014771475 7.9335e-06 deg
peri 34.97141730306424 3.2252e-05 deg
M 276.7166155758329 3.3109e-05 deg
tp 2460188.730419533419
(2023-Sep-01.23041953)
0.00040793 TDB
period 4271.715822931852
11.70
0.00010865
2.975e-07
d
yr
n .08427526898381489 2.1436e-09 deg/d
Q 5.531334407060455 9.3794e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1711  
   data-arc span      15218 days (41.66 yr)  
   first obs. used      1979-05-19  
   last obs. used      2021-01-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5021  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:04:16  

Additional Information
 Earth MOID = 3.79358 au 
 Jupiter MOID = .0170673 au 
 T_jup = 2.965 
[ 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 10.85   n/a E2021B10  
diameter diameter 31.668 km 0.457 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 56.70 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:
[French, L.M.; Stephens, R.D.; Coley, D.; Wasserman, L.; Sieben, J. (2015) Icarus 254, 1-17.]
geometric albedo albedo 0.092   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

19725 (1999 WT4)          Discovered 1999-Nov-28 by Kobayashi, T. at Oizumi
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 WT4 = 1992 GZ3 = 1998 VR15 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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