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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09136376333554473 5.5913e-08  
a 5.252322251841938 6.7154e-08 au
q 4.772450324662636 3.075e-07 au
i 33.54098995865279 5.0516e-06 deg
node 48.54724094464324 7.8724e-06 deg
peri 295.6131671998967 3.5719e-05 deg
M 222.4552639738469 4.0348e-05 deg
tp 2460280.336239955627
(2023-Dec-01.83623996)
0.00051581 TDB
period 4396.686226283779
12.04
8.4321e-05
2.309e-07
d
yr
n .08187984802005843 1.5703e-09 deg/d
Q 5.732194179021239 7.3289e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2123  
   data-arc span      31908 days (87.36 yr)  
   first obs. used      1931-12-31  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43925  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:20:27  

Additional Information
 Earth MOID = 3.88968 au 
 Jupiter MOID = .00251331 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 IRAS-A-FPA-3-RDR-IMPS-V6.0 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. 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:
[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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