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30942 Helicaon (1994 CX13)
Classification: Jupiter Trojan          SPK-ID: 2030942
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06879272276366102 8.99e-08  
a 5.173698153154384 1.4823e-07 au
q 4.81778537044157 4.7893e-07 au
i 22.901678403518 9.6397e-06 deg
node 143.6266851252529 2.4067e-05 deg
peri 270.5347215619889 9.3121e-05 deg
M 60.16870120974555 8.3273e-05 deg
tp 2456682.096906131995
(2014-Jan-24.59690613)
0.00099721 JED
period 4298.332996933496
11.77
0.00018473
5.058e-07
d
yr
n .0837533993426824 3.5994e-09 deg/d
Q 5.5296109358672 1.5843e-07 au
  Orbit Determination Parameters
   # obs. used (total)      541  
   data-arc span      7986 days (21.86 yr)  
   first obs. used      1994-02-08  
   last obs. used      2015-12-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55057  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 14:15:22  

Additional Information
 Earth MOID = 3.92465 au 
 Jupiter MOID = .101317 au 
 T_jup = 2.838 
[ 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 11.3 mag n/a MPO279838  
rotation period rot_per 44.77 h n/a LCDB (Rev. 2015-December); 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.; Coley, D.R.; French, L.M. (2015) Minor Planet Bul. 42, 216-224.]

30942 Helicaon           Discovered 1994 Feb. 8 by E. W. Elst at the European Southern Observatory.
Helicaon, a Trojan warrior, was the son of Antenor and the husband of Laodice, daughter of Priamos, king of Troy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100726/MPCPages.arcLast Updated: 2010-07-28

Alternate Designations
 1994 CX13 = 1999 RH51 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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