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21602 Ialmenus (1998 YW1)
Classification: Jupiter Trojan          SPK-ID: 2021602
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06030956995105648 5.3929e-08  
a 5.212201966961734 1.1663e-07 au
q 4.897856307836221 3.0625e-07 au
i 7.939078873448267 5.4794e-06 deg
node 309.3087384353445 4.5058e-05 deg
peri 193.7822006356525 7.4144e-05 deg
M 259.1894259417134 6.2959e-05 deg
tp 2460613.621313493720
(2024-Oct-30.12131349)
0.00078851 TDB
period 4346.405889965488
11.90
0.00014589
3.994e-07
d
yr
n .08282705506890856 2.7801e-09 deg/d
Q 5.526547626087247 1.2366e-07 au
  Orbit Determination Parameters
   # obs. used (total)      721  
   data-arc span      13641 days (37.35 yr)  
   first obs. used      1983-10-08  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51276  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:50:05  

Additional Information
 Earth MOID = 3.91193 au 
 Jupiter MOID = .350203 au 
 T_jup = 2.977 
[ 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 12.13   n/a MPCxxxxx  
diameter diameter 16.353 km 1.174 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  
geometric albedo albedo 0.151   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  

21602 Ialmenus           Discovered 1998 Dec. 17 by M. Tichy and Z. Moravec at Klet.
Ialmenus was one of the Achaean leaders and one of those who entered Troy in the Wooden Horse. He was the son of Ares and Astyoche. He is counted among the Argonauts and the suitors of Helen. The citation was prepared by J. Ticha.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1998 YW1 = 1989 AD5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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