Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1075229864761532 8.3589e-08  
a 5.215635322589553 2.2682e-07 au
q 4.654834636334209 5.9947e-07 au
i 9.972889913100172 6.5094e-06 deg
node 260.6576453776079 4.8304e-05 deg
peri 160.252787475975 6.8583e-05 deg
M 308.910361150991 5.6469e-05 deg
tp 2459617.932641857105
(2022-Feb-07.43264186)
0.00070805 TDB
period 4350.701161256482
11.91
0.00028381
7.77e-07
d
yr
n .08274528326740604 5.3977e-09 deg/d
Q 5.776436008844896 2.5121e-07 au
  Orbit Determination Parameters
   # obs. used (total)      273  
   data-arc span      16857 days (46.15 yr)  
   first obs. used      1973-09-20  
   last obs. used      2019-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60667  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 15:12:59  

Additional Information
 Earth MOID = 3.66999 au 
 Jupiter MOID = .422246 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Oct-30 22:52 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin