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

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01859048717014351 5.1821e-08  
a 5.141522282015552 9.9199e-08 au
q 5.045938877996734 3.3744e-07 au
i 9.204268467725253 6.4527e-06 deg
node 27.8808362771244 3.0401e-05 deg
peri 46.95798418448457 0.00018777 deg
M 315.5201405854983 0.00018668 deg
tp 2459922.634663397733
(2022-Dec-09.13466340)
0.0022118 TDB
period 4258.297605172539
11.66
0.00012324
3.374e-07
d
yr
n .08454082672913919 2.4467e-09 deg/d
Q 5.237105686034369 1.0104e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1008  
   data-arc span      17313 days (47.40 yr)  
   first obs. used      1973-09-19  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53385  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:19  

Additional Information
 Earth MOID = 4.0658 au 
 Jupiter MOID = .12999 au 
 T_jup = 2.974 
[ 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 11.83   n/a E2021B10  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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