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

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06605708653259267 5.9026e-08  
a 5.190026166846289 1.2198e-07 au
q 4.847188159236504 2.6932e-07 au
i 22.86164586989454 6.558e-06 deg
node 143.5658537564827 1.3533e-05 deg
peri 272.2875087707085 5.464e-05 deg
M 158.9726805491141 5.4411e-05 deg
tp 2456693.403168812697
0.00062507 TDB
period 4318.697129946931
n .08335847343951712 2.9387e-09 deg/d
Q 5.532864174456074 1.3004e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1019  
   data-arc span      9224 days (25.25 yr)  
   first obs. used      1994-02-08  
   last obs. used      2019-05-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55089  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 03:37:49  

Additional Information
 Earth MOID = 3.95487 au 
 Jupiter MOID = .135428 au 
 T_jup = 2.839 
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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 11.3   n/a MPO435977  
diameter diameter 32.544 km 0.781 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (  
rotation period rot_per 44.77 h n/a LCDB (Rev. 2019-January); 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 Bull. 42, 216-224.]
geometric albedo albedo 0.050   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2019-Oct-21 01:09 UT
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