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1208 Troilus (1931 YA)
Classification: Jupiter Trojan          SPK-ID: 2001208
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09232116058654462 2.366e-08  
a 5.25339824861488 4.6091e-08 au
q 4.768398425279433 1.3691e-07 au
i 33.54134752206981 1.0851e-06 deg
node 48.54913586048669 3.2227e-06 deg
peri 295.3139463671807 1.5701e-05 deg
M 288.0535655526852 1.8875e-05 deg
tp 2460275.453074092336
(2023-Nov-26.95307409)
0.00023762 TDB
period 4398.037360766673
12.04
5.7879e-05
1.585e-07
d
yr
n .08185469346200465 1.0772e-09 deg/d
Q 5.738398071950326 5.0346e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2809  
   data-arc span      32685 days (89.49 yr)  
   first obs. used      1931-12-31  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40938  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:06:07  

Additional Information
 Earth MOID = 3.88695 au 
 Jupiter MOID = .00510326 au 
 T_jup = 2.658 
[ 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 8.99   n/a MPO614063 IRAS observations used: 10
diameter diameter 100.477 km 1.097 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 56.17 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:
[Molnar, L.A.; Haegert, M.J.; Hoogenboom, K.M. (2008) Minor Planet Bull. 35, 82-84.]
geometric albedo albedo 0.041   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
B-V BV 0.693   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=3.10, mean=6.26, max.=9.41) deg.
U-B UB 0.314   0.093 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=3.10, mean=6.26, max.=9.41) deg.
Tholen spectral type spec_T FCU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

1208 Troilus (1931 YA)          Discovered 1931-Dec-31 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1931 YA = 1965 WK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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