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JPL Small-Body Database Browser
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18493 Demoleon (1996 HV9)
Classification: Jupiter Trojan          SPK-ID: 2018493
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09312356737988625 5.1274e-08  
a 5.292897525517025 1.0956e-07 au
q 4.800004026164706 3.3654e-07 au
i 17.20323757383417 6.3436e-06 deg
node 215.5389960594761 1.658e-05 deg
peri 89.5746065000164 3.9841e-05 deg
M 274.8490399395856 3.9215e-05 deg
tp 2460052.524136033506
(2023-Apr-18.02413603)
0.00050089 TDB
period 4447.732458957071
12.18
0.0001381
3.781e-07
d
yr
n .08094012023475325 2.5131e-09 deg/d
Q 5.785791024869343 1.1976e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1291  
   data-arc span      11133 days (30.48 yr)  
   first obs. used      1989-11-04  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51073  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:50:05  

Additional Information
 Earth MOID = 3.84201 au 
 Jupiter MOID = .2177 au 
 T_jup = 2.902 
[ 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 10.7   n/a MPO279708  
diameter diameter 33.474 km 0.447 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 14.43 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 0.083   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

18493 Demoleon           Discovered 1996 Apr. 17 by E. W. Elst at the European Southern Observatory.
Demoleon, a Trojan warrior and son of Antenor, was struck in the head by Achilles' spear.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100527/MPCPages.arcLast Updated: 2010-12-06

Alternate Designations
 1996 HV9 = 2000 RZ31 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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