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8458 Georgekoenig (1981 EY9)
Classification: Main-belt Asteroid          SPK-ID: 2008458
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1424134096965565 5.2021e-08  
a 2.266801257947385 9.9366e-09 AU
q 1.943978361698655 1.1735e-07 AU
i 3.692103323077947 5.7122e-06 deg
node 298.6385520761434 8.6562e-05 deg
peri 177.2441491230883 8.9788e-05 deg
M 6.622349522250549 2.2235e-05 deg
tp 2456977.568725542342
(2014-Nov-16.06872554)
7.6996e-05 JED
period 1246.575520820788
3.41
8.1966e-06
2.244e-08
d
yr
n .2887911674721189 1.8989e-09 deg/d
Q 2.589624154196116 1.1352e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1011  
   data-arc span      12542 days (34.34 yr)  
   first obs. used      1981-02-09  
   last obs. used      2015-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51863  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:59:24  

Additional Information
 Earth MOID = .960338 AU 
 T_jup = 3.599 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.8 mag n/a MPO337327  

8458 Georgekoenig           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
George Koenig (b. 1945) is the observatory superintendent for the NASA Infrared Telescope Facility on Mauna Kea, Hawaii. As a member of the IRTF summit day crew since 1983, he has worked to ensure that the telescope and its infrastructure are maintained and operational.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120506/MPCPages.arcLast Updated: 2012-05-09

[ show close-approach data ]
Alternate Designations
 1981 EY9 = 1991 CV 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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