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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01832017448798252 5.1887e-08  
a 5.140855528897684 9.9448e-08 au
q 5.046674158590769 3.3781e-07 au
i 9.204763764080203 6.4535e-06 deg
node 27.88040727328726 3.0483e-05 deg
peri 46.81724294291345 0.00019048 deg
M 299.0617244827064 0.00018931 deg
tp 2459921.174549048490
(2022-Dec-07.67454905)
0.0022439 TDB
period 4257.469307345749
11.66
0.00012354
3.382e-07
d
yr
n .08455727428941495 2.4536e-09 deg/d
Q 5.2350368992046 1.0127e-07 au
  Orbit Determination Parameters
   # obs. used (total)      989  
   data-arc span      17276 days (47.30 yr)  
   first obs. used      1973-09-19  
   last obs. used      2021-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53811  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:50:16  

Additional Information
 Earth MOID = 4.06611 au 
 Jupiter MOID = .128978 au 
 T_jup = 2.974 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457431.5 (2016-Feb-13.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01734200136097042 5.0638e-08  
q 5.050096166843504 3.3158e-07 au
tp 2455713.320016818938
(2011-May-31.82001682)
0.0023879 TDB
node 27.90532576913456 3.047e-05 deg
peri 50.64609366333924 0.00020481 deg
i 9.208257419884188 6.455e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      989  
   data-arc span      17276 days (47.30 yr)  
   first obs. used      1973-09-19  
   last obs. used      2021-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53811  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:50:16  

Additional Information
 Jupiter MOID = .128978 au 
 T_jup = 2.974 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.564207955602775E-15 -1.634746412007622E-14 -3.492467053377315E-11 -3.263149532729663E-15 -3.018362844698372E-12 -1.723650955873869E-15
q -1.634746412007622E-14 1.099433360709286E-13 2.268176886849398E-10 2.386118308343425E-14 1.984623186079391E-11 1.47051489786287E-14
tp -3.492467053377315E-11 2.268176886849398E-10 5.702141418832863E-6 2.37652119258861E-10 4.836212466730648E-7 7.052075316591938E-11
node -3.263149532729663E-15 2.386118308343425E-14 2.37652119258861E-10 9.284048056135777E-10 -8.957957191835399E-10 -8.173576984198544E-11
peri -3.018362844698372E-12 1.984623186079391E-11 4.836212466730648E-7 -8.957957191835399E-10 4.194725800433427E-8 8.686822376558004E-11
i -1.723650955873869E-15 1.47051489786287E-14 7.052075316591938E-11 -8.173576984198544E-11 8.686822376558004E-11 4.166704575524889E-11

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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