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JPL Small-Body Database Browser
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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06522905371182608 5.8918e-08  
a 5.193866857003508 1.1685e-07 au
q 4.855075836815953 2.717e-07 au
i 22.86104445299561 6.0267e-06 deg
node 143.5378559737538 1.3463e-05 deg
peri 271.662955988391 5.2216e-05 deg
M 193.0448168447993 5.3339e-05 deg
tp 2461005.581597698033
(2025-Nov-26.08159770)
0.0006801 TDB
period 4323.491858891753
11.84
0.0001459
3.995e-07
d
yr
n .08326602934607569 2.8098e-09 deg/d
Q 5.532657877191063 1.2447e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1070  
   data-arc span      9278 days (25.40 yr)  
   first obs. used      1994-02-08  
   last obs. used      2019-07-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5507  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 02:11:54  

Additional Information
 Earth MOID = 3.96291 au 
 Jupiter MOID = .13757 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 11.4   n/a MPO474161  
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. 2019-August); 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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