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JPL Small-Body Database Browser
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32720 Simoeisios (2131 T-3)
Classification: Jupiter Trojan          SPK-ID: 2032720
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0147509072858413 5.6068e-08  
a 5.192452081842018 1.1889e-07 au
q 5.115858702596593 3.6481e-07 au
i 7.507423313650764 5.7809e-06 deg
node 248.0423001728374 4.7182e-05 deg
peri 21.87408897029911 0.00024074 deg
M 289.9648390806991 0.00023864 deg
tp 2459441.257602376985
(2021-Aug-14.75760238)
0.0028684 TDB
period 4321.725443088138
11.83
0.00014843
4.064e-07
d
yr
n .08330006261174192 2.8609e-09 deg/d
Q 5.269045461087444 1.2064e-07 au
  Orbit Determination Parameters
   # obs. used (total)      758  
   data-arc span      15191 days (41.59 yr)  
   first obs. used      1977-10-07  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52922  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 03:44:46  

Additional Information
 Earth MOID = 4.10074 au 
 Jupiter MOID = .188554 au 
 T_jup = 2.983 
[ 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 12.0   n/a MPO319485  
diameter diameter 21.130 km 0.663 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  
rotation period rot_per 8.951 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.099   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  

32720 Simoeisios           Discovered 1977 Oct. 16 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Simoeisios was a young Trojan hero who was killed by Ajax.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030318/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 2131 T-3 = 2000 RN81 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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