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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1100088549506696 4.7935e-08  
a 5.19682513885993 1.1309e-07 au
q 4.625128355955095 3.2653e-07 au
i 7.291485767932696 6.1673e-06 deg
node 164.2607565063156 3.0884e-05 deg
peri 269.1402680997312 4.4053e-05 deg
M 272.2605064776431 3.441e-05 deg
tp 2460055.125347713021
(2023-Apr-20.62534771)
0.00043463 TDB
period 4327.18619557503
11.85
0.00014125
3.867e-07
d
yr
n .08319494094525795 2.7157e-09 deg/d
Q 5.768521921764767 1.2553e-07 au
  Orbit Determination Parameters
   # obs. used (total)      760  
   data-arc span      17188 days (47.06 yr)  
   first obs. used      1973-09-29  
   last obs. used      2020-10-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56707  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:31:07  

Additional Information
 Earth MOID = 3.65012 au 
 Jupiter MOID = .0502993 au 
 T_jup = 2.972 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457440.5 (2016-Feb-22.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1081239555317191 4.7795e-08  
q 4.641903114115672 3.2592e-07 au
tp 2455726.628304265461
(2011-Jun-14.12830427)
0.00037297 TDB
node 164.3538759034001 3.0914e-05 deg
peri 269.2074149099981 4.4542e-05 deg
i 7.284258317775472 6.1615e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      760  
   data-arc span      17188 days (47.06 yr)  
   first obs. used      1973-09-29  
   last obs. used      2020-10-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56707  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:31:07  

Additional Information
 Jupiter MOID = .0502993 au 
 T_jup = 2.972 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.284323227490767E-15 -1.518000359912834E-14 -5.172055681694986E-12 -4.919296837745413E-15 -5.275664029230282E-13 -1.070773510043386E-15
q -1.518000359912834E-14 1.062270213181051E-13 3.980973576695428E-11 4.308517642403994E-14 4.193786383443311E-12 1.030595826982404E-14
tp -5.172055681694986E-12 3.980973576695428E-11 1.391060407820014E-7 3.618036385188312E-11 1.190473491642921E-8 3.14036673597797E-12
node -4.919296837745413E-15 4.308517642403994E-14 3.618036385188312E-11 9.557057494590926E-10 -9.441313028885568E-10 4.960713676600405E-12
peri -5.275664029230282E-13 4.193786383443311E-12 1.190473491642921E-8 -9.441313028885568E-10 1.983997196045539E-9 -4.461413282836519E-12
i -1.070773510043386E-15 1.030595826982404E-14 3.14036673597797E-12 4.960713676600405E-12 -4.461413282836519E-12 3.79646091046525E-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 12.2   n/a MPO412370  

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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