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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1569320868306194 8.0969e-08  
a 2.642269110401499 2.5884e-08 au
q 2.227612304938107 2.1199e-07 au
i 10.45755137783548 8.3039e-06 deg
node 9.531635719569788 3.4343e-05 deg
peri 319.6227833497848 4.3726e-05 deg
M 260.028070311969 3.6263e-05 deg
tp 2457836.151860070566
(2017-Mar-23.65186007)
0.0001617 JED
period 1568.787059675816
4.30
2.3052e-05
6.311e-08
d
yr
n .2294766506261166 3.372e-09 deg/d
Q 3.05692591586489 2.9946e-08 au
  Orbit Determination Parameters
   # obs. used (total)      991  
   data-arc span      12485 days (34.18 yr)  
   first obs. used      1981-02-12  
   last obs. used      2015-04-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .47408  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:01:46  

Additional Information
 Earth MOID = 1.22713 au 
 Jupiter MOID = 2.34552 au 
 T_jup = 3.353 
[ 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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