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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01803130879503983 5.2949e-08  
a 5.140228475037417 1.1215e-07 au
q 5.047543428126961 3.3775e-07 au
i 9.205290799730992 6.5276e-06 deg
node 27.87876272377928 3.732e-05 deg
peri 46.8866093329753 0.00021426 deg
M 282.0504337745794 0.00021421 deg
tp 2459922.186578867119
(2022-Dec-08.68657887)
0.0025447 TDB
period 4256.690376346896
11.65
0.00013931
3.814e-07
d
yr
n .08457274740967959 2.7679e-09 deg/d
Q 5.232913521947873 1.1417e-07 au
  Orbit Determination Parameters
   # obs. used (total)      807  
   data-arc span      16864 days (46.17 yr)  
   first obs. used      1973-09-19  
   last obs. used      2019-11-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56644  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:48:03  

Additional Information
 Earth MOID = 4.06764 au 
 Jupiter MOID = .128247 au 
 T_jup = 2.974 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456663.5 (2014-Jan-06.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01829597581942353 5.1841e-08  
q 5.046031451583074 3.3159e-07 au
tp 2455734.242451773069
(2011-Jun-21.74245177)
0.0024928 TDB
node 27.90829397408896 3.7304e-05 deg
peri 52.31114710877705 0.00021434 deg
i 9.208032985211133 6.5285e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      807  
   data-arc span      16864 days (46.17 yr)  
   first obs. used      1973-09-19  
   last obs. used      2019-11-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56644  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:48:03  

Additional Information
 Jupiter MOID = .128247 au 
 T_jup = 2.974 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.687446833517417E-15 -1.637790605443864E-14 -1.948239798651177E-11 -3.505661368748199E-17 -1.725743972993366E-12 -9.860150161497513E-16
q -1.637790605443864E-14 1.099516961373465E-13 2.027996897137217E-10 -1.363679055984096E-15 1.784128650214943E-11 1.182629028019598E-14
tp -1.948239798651177E-11 2.027996897137217E-10 6.21404019671256E-6 -2.092494484503522E-11 5.262221498258236E-7 7.256422127502209E-11
node -3.505661368748199E-17 -1.363679055984096E-15 -2.092494484503522E-11 1.391583581936475E-9 -1.375114146488555E-9 -6.338193454136878E-11
peri -1.725743972993366E-12 1.784128650214943E-11 5.262221498258236E-7 -1.375114146488555E-9 4.594336141822841E-8 6.890154863179588E-11
i -9.860150161497513E-16 1.182629028019598E-14 7.256422127502209E-11 -6.338193454136878E-11 6.890154863179588E-11 4.262137731594801E-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 11.9   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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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