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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1268628271151899 6.3444e-08  
a 5.281099137802645 8.7627e-08 au
q 4.611123970905409 3.5403e-07 au
i 3.20100842422728 6.0092e-06 deg
node 12.28560830714806 8.7749e-05 deg
peri 347.7223261423674 8.9921e-05 deg
M 230.5523812804814 2.3006e-05 deg
tp 2460594.456525897744
(2024-Oct-10.95652590)
0.00030691 TDB
period 4432.869101798815
12.14
0.00011033
3.021e-07
d
yr
n .08121151149126318 2.0213e-09 deg/d
Q 5.951074304699881 9.8744e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1036  
   data-arc span      17932 days (49.10 yr)  
   first obs. used      1971-03-25  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52908  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:46:35  

Additional Information
 Earth MOID = 3.60805 au 
 Jupiter MOID = .304172 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-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:
[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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