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18268 Dardanos (2140 T-3)
Classification: Jupiter Trojan          SPK-ID: 2018268
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09634790838338748 5.1614e-08  
a 5.160991586374847 1.1365e-07 au
q 4.663740841843369 3.2291e-07 au
i 16.59782415920789 6.6523e-06 deg
node 218.3867434384726 1.6461e-05 deg
peri 112.4612791777602 4.2445e-05 deg
M 262.9865061162994 4.3157e-05 deg
tp 2460154.558431908463
(2023-Jul-29.05843191)
0.00053962 TDB
period 4282.507709547085
11.72
0.00014146
3.873e-07
d
yr
n .08406289595169773 2.7768e-09 deg/d
Q 5.658242330906324 1.246e-07 au
  Orbit Determination Parameters
   # obs. used (total)      765  
   data-arc span      15617 days (42.76 yr)  
   first obs. used      1977-10-07  
   last obs. used      2020-07-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53731  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:16:01  

Additional Information
 Earth MOID = 3.69793 au 
 Jupiter MOID = .0229677 au 
 T_jup = 2.908 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457309.5 (2015-Oct-14.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09566805671621444 5.1643e-08  
q 4.669086949086754 3.2258e-07 au
tp 2455885.100354072997
(2011-Nov-19.60035407)
0.00045579 TDB
node 218.3899824761985 1.6461e-05 deg
peri 113.4008016880475 4.2719e-05 deg
i 16.59585837678753 6.6514e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      765  
   data-arc span      15617 days (42.76 yr)  
   first obs. used      1977-10-07  
   last obs. used      2020-07-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53731  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:16:01  

Additional Information
 Jupiter MOID = .0229677 au 
 T_jup = 2.908 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.666952627304782E-15 -1.592475923953049E-14 -2.408999796572028E-13 -2.357736799375033E-15 -3.344942494452048E-14 -1.318484354413165E-15
q -1.592475923953049E-14 1.040593205318271E-13 2.589361003638381E-11 2.521335271298748E-14 2.525881342454746E-12 1.076082124831363E-14
tp -2.408999796572028E-13 2.589361003638381E-11 2.077413685157076E-7 1.8385357653501E-11 1.796858083129571E-8 9.281752479833701E-12
node -2.357736799375033E-15 2.521335271298748E-14 1.8385357653501E-11 2.709677363619995E-10 -2.57462281630117E-10 -1.082337420007475E-11
peri -3.344942494452048E-14 2.525881342454746E-12 1.796858083129571E-8 -2.57462281630117E-10 1.824920416373791E-9 1.118748260881207E-11
i -1.318484354413165E-15 1.076082124831363E-14 9.281752479833701E-12 -1.082337420007475E-11 1.118748260881207E-11 4.424048353988258E-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 MPO435869  
diameter diameter 20.352 km 0.586 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
geometric albedo albedo 0.074   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

18268 Dardanos           Discovered 1977 Oct. 16 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Dardanos was a son of Zeus and a nymph, mythical ancestor of the Trojans.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010309/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 2140 T-3 = 1997 LV12 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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