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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01723798345861579 7.7975e-08  
a 5.139307314663532 1.4382e-07 au
q 5.050716020184619 3.9701e-07 au
i 9.207653912339779 9.2187e-06 deg
node 27.90357092761916 4.4492e-05 deg
peri 50.10895371564384 0.00029409 deg
M 160.2118960880168 0.00028697 deg
tp 2455706.641322162664
(2011-May-25.14132216)
0.0033978 JED
period 4255.546190196022
11.65
0.00017863
4.891e-07
d
yr
n .08459548643353286 3.5511e-09 deg/d
Q 5.227898609142446 1.463e-07 au
  Orbit Determination Parameters
   # obs. used (total)      652  
   data-arc span      15519 days (42.49 yr)  
   first obs. used      1973-09-19  
   last obs. used      2016-03-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .59046  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 16:39:29  

Additional Information
 Earth MOID = 4.07043 au 
 Jupiter MOID = .132897 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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