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13229 Echion (1997 VB1)
Classification: Jupiter Trojan          SPK-ID: 2013229
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07440796104506865 4.8052e-08  
a 5.258052945635931 8.8832e-08 au
q 4.866811946884144 2.6834e-07 au
i 3.837324825713039 5.6906e-06 deg
node 343.009941139776 5.8647e-05 deg
peri 166.8334595943225 6.8896e-05 deg
M 238.3801586142064 3.9709e-05 deg
tp 2460688.276830730002
(2025-Jan-12.77683073)
0.00051125 TDB
period 4403.883880787268
12.06
0.0001116
3.055e-07
d
yr
n .08174602458765191 2.0716e-09 deg/d
Q 5.649293944387718 9.5442e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1168  
   data-arc span      15643 days (42.83 yr)  
   first obs. used      1978-03-15  
   last obs. used      2021-01-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49875  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 23:49:30  

Additional Information
 Earth MOID = 3.87789 au 
 Jupiter MOID = .358742 au 
 T_jup = 2.990 
[ 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 11.69   n/a E2021B10  
diameter diameter 27.554 km 0.554 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 8.46 h n/a LCDB (Rev. 2020-October); 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:
[French, L.M.; Stephens, R.D.; Coley, D.R.; Wasserman, L.H.; et al. (2013) Minor Planet Bull. 40, 198-203.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.053   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

13229 Echion           Discovered 1997 Nov. 2 by J. Ticha and M. Tichy at Klet.
Echion was one of the Achaean warriors who entered Troy in the wooden horse. He died when he jumped from the horse.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000523/MPCPages.arcLast Updated: 2013-03-29

Alternate Designations
 1997 VB1 = 1978 EG9 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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