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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06502218088728155 5.1566e-08  
a 5.195719155919766 1.0845e-07 au
q 4.857882165124037 2.4978e-07 au
i 22.86222045332433 4.1177e-06 deg
node 143.5298280522331 1.3262e-05 deg
peri 271.2248132254627 4.8072e-05 deg
M 210.1877832980982 5.161e-05 deg
tp 2461000.662284194338
(2025-Nov-21.16228419)
0.00066226 TDB
period 4325.80490815029
11.84
0.00013543
3.708e-07
d
yr
n .08322150620378663 2.6055e-09 deg/d
Q 5.533556146715494 1.155e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1315  
   data-arc span      9749 days (26.69 yr)  
   first obs. used      1994-02-08  
   last obs. used      2020-10-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5147  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:42:34  

Additional Information
 Earth MOID = 3.96481 au 
 Jupiter MOID = .137537 au 
 T_jup = 2.839 
[ 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 11.41   n/a E2021B10  
diameter diameter 32.544 km 0.781 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 44.77 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:
[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] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

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 ]
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