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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1100088522477181 4.7762e-08  
a 5.196825133842202 1.1272e-07 au
q 4.625128365536128 3.2626e-07 au
i 7.291485719861662 6.167e-06 deg
node 164.2607628637291 2.9995e-05 deg
peri 269.1402612312072 4.3467e-05 deg
M 272.2605075947751 3.434e-05 deg
tp 2460055.125332757717
(2023-Apr-20.62533276)
0.00043364 TDB
period 4327.186189307941
11.85
0.00014078
3.854e-07
d
yr
n .08319494106574965 2.7067e-09 deg/d
Q 5.768521902148276 1.2512e-07 au
  Orbit Determination Parameters
   # obs. used (total)      773  
   data-arc span      17213 days (47.13 yr)  
   first obs. used      1973-09-29  
   last obs. used      2020-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56412  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 20:50:06  

Additional Information
 Earth MOID = 3.65012 au 
 Jupiter MOID = .0502993 au 
 T_jup = 2.972 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457526.5 (2016-May-18.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1080704518897481 4.7626e-08  
q 4.642121460260009 3.2561e-07 au
tp 2455725.832003291968
(2011-Jun-13.33200329)
0.00037279 TDB
node 164.3525552028426 3.0025e-05 deg
peri 269.1540996772879 4.398e-05 deg
i 7.284168510971923 6.1611e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      773  
   data-arc span      17213 days (47.13 yr)  
   first obs. used      1973-09-29  
   last obs. used      2020-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56412  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 20:50:06  

Additional Information
 Jupiter MOID = .0502993 au 
 T_jup = 2.972 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.268243267085027E-15 -1.512648050880125E-14 -5.251672779009491E-12 -3.396839782456002E-15 -5.348727640148804E-13 -1.088383109813653E-15
q -1.512648050880125E-14 1.060228594304613E-13 4.009607277126474E-11 3.015402111130126E-14 4.228283674163325E-12 1.030413745407227E-14
tp -5.251672779009491E-12 4.009607277126474E-11 1.389748113842628E-7 1.577256921661385E-11 1.191854433172293E-8 3.131577388429663E-12
node -3.396839782456002E-15 3.015402111130126E-14 1.577256921661385E-11 9.01522036538771E-10 -8.922609330606323E-10 5.357617429410891E-12
peri -5.348727640148804E-13 4.228283674163325E-12 1.191854433172293E-8 -8.922609330606323E-10 1.934254864934745E-9 -4.857030720011279E-12
i -1.088383109813653E-15 1.030413745407227E-14 3.131577388429663E-12 5.357617429410891E-12 -4.857030720011279E-12 3.795973547176665E-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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