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JPL Small-Body Database Browser
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216462 Polyphontes (5397 T-2)
Classification: Jupiter Trojan          SPK-ID: 2216462
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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .10704500474909 8.363e-08  
a 5.214014002536442 2.2944e-07 au
q 4.655879848873107 5.9947e-07 au
i 9.97288399729562 6.7004e-06 deg
node 260.6577713001371 4.8323e-05 deg
peri 160.3212235899479 6.906e-05 deg
M 275.6871683049298 5.6061e-05 deg
tp 2459618.969180257107
(2022-Feb-08.46918026)
0.00071972 TDB
period 4348.672645921778
11.91
0.00028704
7.859e-07
d
yr
n .08278388126952049 5.4642e-09 deg/d
Q 5.772148156199777 2.54e-07 au
  Orbit Determination Parameters
   # obs. used (total)      269  
   data-arc span      16813 days (46.03 yr)  
   first obs. used      1973-09-20  
   last obs. used      2019-10-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60895  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-08 00:04:18  

Additional Information
 Earth MOID = 3.67072 au 
 Jupiter MOID = .420351 au 
 T_jup = 2.958 
[ 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 12.7   n/a MPO418160  
diameter diameter 10.122 km 1.177 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  
geometric albedo albedo 0.172   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  

216462 Polyphontes           Discovered 1973 Sept. 30 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Polyphontes, a Greek hero, son of Autophonos, was one of the leaders of an ambush against Tydeus near Thebes. He was killed by Tydeus. The name was suggested by I. J. F. de Jong.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100726/MPCPages.arcLast Updated: 2010-07-28

Alternate Designations
 5397 T-2 = 2002 GM52 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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