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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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09684429072242627 5.0934e-08  
a 5.160273585278754 9.7434e-08 au
q 4.660530549978761 3.2211e-07 au
i 16.59989172795759 6.0037e-06 deg
node 218.3891131318826 1.4866e-05 deg
peri 112.5893263990529 3.6661e-05 deg
M 296.2070339296884 3.6111e-05 deg
tp 2460155.213501621980
(2023-Jul-29.71350162)
0.0004418 TDB
period 4281.614062009057
11.72
0.00012126
3.32e-07
d
yr
n .08408044134437413 2.3813e-09 deg/d
Q 5.660016620578746 1.0687e-07 au
  Orbit Determination Parameters
   # obs. used (total)      885  
   data-arc span      15972 days (43.73 yr)  
   first obs. used      1977-10-07  
   last obs. used      2021-06-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52265  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 04:35:23  

Additional Information
 Earth MOID = 3.69392 au 
 Jupiter MOID = .0235672 au 
 T_jup = 2.908 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.03   n/a MPO614063  
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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