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9142 Rhesus (5191 T-3)
Classification: Jupiter Trojan          SPK-ID: 2009142
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1306470828523375 3.836e-08  
a 5.165739959177126 8.0204e-08 au
q 4.490851102736881 2.2798e-07 au
i 12.80655708906833 4.2984e-06 deg
node 141.1982036429106 1.8555e-05 deg
peri 173.3217633028416 2.5726e-05 deg
M 266.2817022929396 2.087e-05 deg
tp 2460116.898200860186
(2023-Jun-21.39820086)
0.00026523 TDB
period 4288.419253686349
11.74
9.9873e-05
2.734e-07
d
yr
n .08394701606904269 1.9551e-09 deg/d
Q 5.840628815617371 9.0682e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1706  
   data-arc span      23912 days (65.47 yr)  
   first obs. used      1954-12-22  
   last obs. used      2020-06-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46381  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:55:43  

Additional Information
 Earth MOID = 3.47759 au 
 Jupiter MOID = .425893 au 
 T_jup = 2.934 
[ 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 10.6   n/a MPO358719  
diameter diameter 42.306 km 0.460 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 7.325 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.062   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

9142 Rhesus           Discovered 1977 Oct. 16 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Named for the king of the Thracians and ally of the Trojans. He and his twelve companions were stealthily assassinated in their sleep by Odysseus and Diomedes.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19981208/MPCPages.arcLast Updated: 2009-11-17

Alternate Designations
 5191 T-3 = 1988 RX 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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