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30708 Echepolos (4101 T-3)
Classification: Jupiter Trojan          SPK-ID: 2030708
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01283816481933927 1.3545e-07  
a 5.211974886213119 1.5831e-07 au
q 5.145062693589657 7.3136e-07 au
i 24.14781065462994 1.7912e-05 deg
node 29.44293156335118 2.0406e-05 deg
peri 27.54041486606702 0.00054088 deg
M 46.09244378975567 0.0005353 deg
tp 2457044.046174494766
(2015-Jan-21.54617450)
0.0064643 JED
period 4346.121852328585
11.90
0.00019801
5.421e-07
d
yr
n .08283246817093211 3.7739e-09 deg/d
Q 5.278887078836579 1.6034e-07 au
  Orbit Determination Parameters
   # obs. used (total)      415  
   data-arc span      22301 days (61.06 yr)  
   first obs. used      1954-12-21  
   last obs. used      2016-01-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .61341  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 21:06:32  

Additional Information
 Earth MOID = 4.15602 au 
 Jupiter MOID = .18113 au 
 T_jup = 2.825 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.8 mag n/a MPO319462  

30708 Echepolos           Discovered 1977 Oct. 16 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Echepolos was the first hero in the great fight after the duel of Paris against Menelaos, who was killed by Antilochos.
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
 4101 T-3 = 1989 TF6 = 1996 FR16 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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