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26057 Ankaios (4742 T-2)
Classification: Jupiter Trojan          SPK-ID: 2026057
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1104008075777943 4.7628e-08  
a 5.194326267357668 1.1265e-07 au
q 4.620868452618832 3.2555e-07 au
i 7.293768793572831 6.1687e-06 deg
node 164.2599930680419 2.9938e-05 deg
peri 269.4262175077323 4.3366e-05 deg
M 288.6683410135972 3.4566e-05 deg
tp 2460057.285461587786
(2023-Apr-22.78546159)
0.00043242 TDB
period 4324.065506879602
11.84
0.00014067
3.851e-07
d
yr
n .08325498293844966 2.7084e-09 deg/d
Q 5.767784082096504 1.2509e-07 au
  Orbit Determination Parameters
   # obs. used (total)      777  
   data-arc span      17225 days (47.16 yr)  
   first obs. used      1973-09-29  
   last obs. used      2020-11-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56293  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 05:11:42  

Additional Information
 Earth MOID = 3.64543 au 
 Jupiter MOID = .0505418 au 
 T_jup = 2.972 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457531.5 (2016-May-23.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .108067623910941 4.7618e-08  
q 4.642134559680427 3.256e-07 au
tp 2455725.788160874014
(2011-Jun-13.28816087)
0.00037278 TDB
node 164.3524300004861 2.9978e-05 deg
peri 269.1512769491232 4.395e-05 deg
i 7.284160914052062 6.1611e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      777  
   data-arc span      17225 days (47.16 yr)  
   first obs. used      1973-09-29  
   last obs. used      2020-11-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56293  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 05:11:42  

Additional Information
 Jupiter MOID = .0505418 au 
 T_jup = 2.972 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.267521105321293E-15 -1.512427284317216E-14 -5.256377620623973E-12 -3.30923313078278E-15 -5.353166047488091E-13 -1.090036514016954E-15
q -1.512427284317216E-14 1.06014638434538E-13 4.011201226991107E-11 2.941933249151328E-14 4.23026628510039E-12 1.030982081827314E-14
tp -5.256377620623973E-12 4.011201226991107E-11 1.389615190476363E-7 1.463548857645743E-11 1.19188144722814E-8 3.140335122995492E-12
node -3.30923313078278E-15 2.941933249151328E-14 1.463548857645743E-11 8.986964185407852E-10 -8.89562724157678E-10 5.403791497966048E-12
peri -5.353166047488091E-13 4.23026628510039E-12 1.19188144722814E-8 -8.89562724157678E-10 1.931632786288335E-9 -4.90209020088057E-12
i -1.090036514016954E-15 1.030982081827314E-14 3.140335122995492E-12 5.403791497966048E-12 -4.90209020088057E-12 3.795885018255081E-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 12.25   n/a E2021B10  

26057 Ankaios           Discovered 1973 Sept. 30 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Ankaios was the father of hero Agapenor from Arkadie.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030318/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 4742 T-2 = 1998 UQ28 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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