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11887 Echemmon (1990 TV12)
Classification: Jupiter Trojan          SPK-ID: 2011887
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09187469306122643 5.5623e-08  
a 5.181942047739305 1.0185e-07 au
q 4.705852712642193 3.1088e-07 au
i 24.04468904725605 6.657e-06 deg
node 242.6496935313272 1.3285e-05 deg
peri 111.4664983365314 3.8612e-05 deg
M 239.0886467028029 3.9716e-05 deg
tp 2460447.610969956400
(2024-May-17.11096996)
0.0005031 TDB
period 4308.610688557898
11.80
0.00012703
3.478e-07
d
yr
n .08355361531178228 2.4634e-09 deg/d
Q 5.658031382836417 1.1121e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1255  
   data-arc span      23998 days (65.70 yr)  
   first obs. used      1954-11-23  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4846  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 00:28:34  

Additional Information
 Earth MOID = 3.7889 au 
 Jupiter MOID = .0571126 au 
 T_jup = 2.819 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.8   n/a MPO324419  
diameter diameter 31.190 km 0.494 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 8.47 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Stephens, R.D.; French, L.M.; Davitt, C.; Coley, D.R. (2014) Minor Planet Bull. 41, 95-100.]
geometric albedo albedo 0.095   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

11887 Echemmon           Discovered 1990 Oct. 14 by F. Borngen and L. D. Schmadel at Tautenburg.
The hero Echemmon, son of the king of Troy Priamos, was killed together with his brother Chromios by Diomedes, king of Argos. The name was suggested by the first discoverer.
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
 1990 TV12 = 1989 SX13 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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