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20961 Arkesilaos (1973 SS1)
Classification: Jupiter Trojan          SPK-ID: 2020961
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01779078511047389 7.8046e-08  
a 5.139284461730392 1.8979e-07 AU
q 5.047852556250149 4.313e-07 AU
i 9.208641035650169 9.2652e-06 deg
node 27.90588876555551 5.427e-05 deg
peri 51.75807090018841 0.00037238 deg
M 107.7143272171709 0.00035879 deg
tp 2455727.221562817314
(2011-Jun-14.72156282)
0.0042731 JED
period 4255.517805552385
11.65
0.00023573
6.454e-07
d
yr
n .08459605069218373 4.6862e-09 deg/d
Q 5.230716367210634 1.9317e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      523  
   data-arc span      14811 days (40.55 yr)  
   first obs. used      1973-09-19  
   last obs. used      2014-04-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .60964  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 22:52:05  

Additional Information
 Earth MOID = 4.06963 AU 
 T_jup = 2.974 
[ 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 11.9 mag n/a MPO279732  

20961 Arkesilaos           Discovered 1973 Sept. 19 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Arkesilaos, who was from Boeotia, was one of the first heroes to join the Greek army.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010705/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1973 SS1 = 1996 RQ28 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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