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8464 Polishook (1981 EF28)
Classification: Main-belt Asteroid          SPK-ID: 2008464
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1570404255626257 7.2131e-08  
a 2.641993597191502 2.3089e-08 au
q 2.227093798354816 1.9293e-07 au
i 10.45762497376711 7.9247e-06 deg
node 9.531505652804128 3.2824e-05 deg
peri 319.6674834716011 4.1088e-05 deg
M 305.8949394488985 3.2029e-05 deg
tp 2457836.239009633820
(2017-Mar-23.73900963)
0.00014102 JED
period 1568.541696539096
4.29
2.0562e-05
5.63e-08
d
yr
n .2295125470966572 3.0087e-09 deg/d
Q 3.056893396028188 2.6715e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1056  
   data-arc span      12850 days (35.18 yr)  
   first obs. used      1981-02-12  
   last obs. used      2016-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .47581  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:02:27  

Additional Information
 Earth MOID = 1.22783 au 
 Jupiter MOID = 2.34645 au 
 T_jup = 3.354 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.4 mag n/a MPO337327  

8464 Polishook           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
David L. Polishook (b. 1976) is a Postdoctoral Fellow at the Massachusetts Institute of Technology. His 2010 Ph.D. thesis at Tel Aviv University explored minor-planet spin evolution and his ongoing investigations include spectral studies of minor-planet binaries and separated pairs.
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

Alternate Designations
 1981 EF28 = 1987 WB5 = 1991 RC13 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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