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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09684428939593322 5.0813e-08  
a 5.160273577690887 9.4723e-08 au
q 4.660530549970803 3.2208e-07 au
i 16.59989153907216 5.7503e-06 deg
node 218.3891134301113 1.4464e-05 deg
peri 112.5893234693002 3.5592e-05 deg
M 296.2070372026012 3.4636e-05 deg
tp 2460155.213461022547
(2023-Jul-29.71346102)
0.00042329 TDB
period 4281.614052565281
11.72
0.00011789
3.228e-07
d
yr
n .08408044152982684 2.3151e-09 deg/d
Q 5.660016605410971 1.039e-07 au
  Orbit Determination Parameters
   # obs. used (total)      937  
   data-arc span      16011 days (43.84 yr)  
   first obs. used      1977-10-07  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52934  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:08:02  

Additional Information
 Earth MOID = 3.69392 au 
 Jupiter MOID = .0235672 au 
 T_jup = 2.908 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457839.5 (2017-Mar-27.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09535681656836865 5.0726e-08  
q 4.670126040857329 3.2197e-07 au
tp 2455880.085825501194
(2011-Nov-14.58582550)
0.0003781 TDB
node 218.3903515208878 1.4466e-05 deg
peri 113.0374454193605 3.6128e-05 deg
i 16.5958670351376 5.7491e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      937  
   data-arc span      16011 days (43.84 yr)  
   first obs. used      1977-10-07  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52934  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:08:02  

Additional Information
 Jupiter MOID = .0235672 au 
 T_jup = 2.908 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.573146486011592E-15 -1.595830756179178E-14 -2.737571320154026E-12 1.513319456758774E-15 -2.516215589008986E-13 -3.214148622236589E-15
q -1.595830756179178E-14 1.036639493732125E-13 2.446295930556666E-11 -9.660546689615285E-15 2.439020785169273E-12 2.37864247589685E-14
tp -2.737571320154026E-12 2.446295930556666E-11 1.429629883027936E-7 -5.124789820850414E-11 1.248439234169251E-8 3.167450995740874E-11
node 1.513319456758774E-15 -9.660546689615285E-15 -5.124789820850414E-11 2.092765219820346E-10 -2.047369645490767E-10 1.527937831434593E-11
peri -2.516215589008986E-13 2.439020785169273E-12 1.248439234169251E-8 -2.047369645490767E-10 1.305242858982595E-9 -1.181480487232635E-11
i -3.214148622236589E-15 2.37864247589685E-14 3.167450995740874E-11 1.527937831434593E-11 -1.181480487232635E-11 3.305229097228828E-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 12.05   n/a MPO636339  
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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