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JPL Small-Body Database Browser
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18228 Hyperenor (3163 T-1)
Classification: Jupiter Trojan          SPK-ID: 2018228
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1263615734497106 7.1442e-08  
a 5.282267403916675 9.0667e-08 au
q 4.614791783375646 3.8721e-07 au
i 3.200359025915158 6.2281e-06 deg
node 12.28232801665496 9.4003e-05 deg
peri 347.8611664285593 9.6118e-05 deg
M 197.8732729809658 2.2697e-05 deg
tp 2460597.514027564330
(2024-Oct-14.01402756)
0.00030881 TDB
period 4434.340118632966
12.14
0.00011417
3.126e-07
d
yr
n .08118457095505387 2.0902e-09 deg/d
Q 5.949743024457704 1.0212e-07 au
  Orbit Determination Parameters
   # obs. used (total)      995  
   data-arc span      17579 days (48.13 yr)  
   first obs. used      1971-03-25  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .532  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:35:21  

Additional Information
 Earth MOID = 3.61088 au 
 Jupiter MOID = .303973 au 
 T_jup = 2.981 
[ 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 11.8   n/a MPO474007  
diameter diameter 23.245 km 1.155 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 32.839 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.068   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

18228 Hyperenor           Discovered 1971 Mar. 26 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Hyperenor was one of the sons of Panthoos and a great hero on the Trojan side.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010309/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 3163 T-1 = 1992 BE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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