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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .155914578626239 8.0731e-08  
a 2.645250465143763 3.09e-08 AU
q 2.232817353510011 2.125e-07 AU
i 10.44556289776764 9.6872e-06 deg
node 9.568821923653662 3.8549e-05 deg
peri 319.2418989509222 4.8939e-05 deg
M 168.710021369084 3.6227e-05 deg
tp 2456264.060616660829
(2012-Dec-02.56061666)
0.00015394 JED
period 1571.442975649366
4.30
2.7535e-05
7.539e-08
d
yr
n .2290888091890433 4.0141e-09 deg/d
Q 3.057683576777516 3.5718e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      800  
   data-arc span      12010 days (32.88 yr)  
   first obs. used      1981-02-12  
   last obs. used      2013-12-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48623  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 19:16:14  

Additional Information
 Earth MOID = 1.23493 AU 
 T_jup = 3.352 
[ 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 13.2 mag n/a PDS3 (MPC 31487)  

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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