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JPL Small-Body Database Browser
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9817 Thersander (6540 P-L)
Classification: Jupiter Trojan          SPK-ID: 2009817
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04115430674252868 5.5836e-08  
a 5.262413379736941 1.2309e-07 au
q 5.04584240530126 3.0612e-07 au
i 9.165863276365419 6.8675e-06 deg
node 24.28101253731381 3.7968e-05 deg
peri 80.37378169841013 0.00010405 deg
M 234.0001777122342 9.8172e-05 deg
tp 2460543.774922609605
(2024-Aug-21.27492261)
0.0012291 TDB
period 4409.363140771693
12.07
0.0001547
4.235e-07
d
yr
n .08164444354133998 2.8645e-09 deg/d
Q 5.478984354172622 1.2815e-07 au
  Orbit Determination Parameters
   # obs. used (total)      794  
   data-arc span      21558 days (59.02 yr)  
   first obs. used      1960-09-24  
   last obs. used      2019-10-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60952  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 03:19:45  

Additional Information
 Earth MOID = 4.07778 au 
 Jupiter MOID = .195451 au 
 T_jup = 2.973 
[ 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 11.5   n/a MPO492864  
diameter diameter 22.879 km 2.052 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
geometric albedo albedo 0.102   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

9817 Thersander           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Thersander, a son of the Theban Polyneices, was wounded by Telephus and later was one of the heroes in the Wooden Horse.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990402/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 6540 P-L = 1991 HV2 = 1996 RB33 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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