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12242 Koon (1988 QY)
Classification: Jupiter Trojan          SPK-ID: 2012242
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06825307976583719 3.2322e-08  
a 5.106397221787399 8.2099e-08 au
q 4.757869884892694 2.2099e-07 au
i 29.77538935336871 1.7016e-06 deg
node 222.65327816237 5.4153e-06 deg
peri 93.22086209843937 2.8627e-05 deg
M 320.4562103906191 3.0736e-05 deg
tp 2459859.462810286497
(2022-Oct-06.96281029)
0.00036381 TDB
period 4214.735445173442
11.54
0.00010164
2.783e-07
d
yr
n .08541461372439368 2.0599e-09 deg/d
Q 5.454924558682103 8.7703e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1736  
   data-arc span      24380 days (66.75 yr)  
   first obs. used      1954-09-28  
   last obs. used      2021-06-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45799  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 02:55:44  

Additional Information
 Earth MOID = 3.90507 au 
 Jupiter MOID = .0887559 au 
 T_jup = 2.735 
[ 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 10.88   n/a E2021B10  
diameter diameter 37.861 km 0.556 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 17.0111 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.071   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

12242 Koon           Discovered 1988 Aug. 18 by C. S. Shoemaker and E. M. Shoemaker at Palomar.
Koon, a notable fighter, was the eldest son of Antenor. Grieved by the death of his brother Iphidamas at the hands of Agamemnon, he fought and wounded him but was in turn beheaded by Agamemnon.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20001013/MPCPages.arcLast Updated: 2013-03-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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