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

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09162600173424097 7.4973e-08  
a 5.182997187232537 1.1998e-07 au
q 4.708099877966603 3.854e-07 au
i 24.04423694523352 8.7382e-06 deg
node 242.6514159005981 1.7537e-05 deg
peri 112.4883825057228 5.6955e-05 deg
M 120.8722727840961 4.9878e-05 deg
tp 2456153.414892235646
(2012-Aug-13.91489224)
0.00059634 JED
period 4309.926725095154
11.80
0.00014966
4.097e-07
d
yr
n .08352810220736454 2.9004e-09 deg/d
Q 5.657894496498471 1.3098e-07 au
  Orbit Determination Parameters
   # obs. used (total)      775  
   data-arc span      22352 days (61.20 yr)  
   first obs. used      1954-11-23  
   last obs. used      2016-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54377  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 18:47:27  

Additional Information
 Earth MOID = 3.78844 au 
 Jupiter MOID = .0496952 au 
 T_jup = 2.819 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.8 mag n/a MPO324419  
rotation period rot_per 8.47 h n/a LCDB (Rev. 2016-February); 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 Bul. 41, 95-100.]

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 | Physical Parameters | Discovery Circumstances ]
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