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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 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1559145799506634 8.0503e-08  
a 2.645250461582204 2.7533e-08 AU
q 2.232817347000316 2.1083e-07 AU
i 10.44555875219045 8.6216e-06 deg
node 9.568808590426267 3.6318e-05 deg
peri 319.2419150519581 4.5897e-05 deg
M 168.7100199465484 3.5829e-05 deg
tp 2456264.060624357677
(2012-Dec-02.56062436)
0.00015116 JED
period 1571.442972475685
4.30
2.4534e-05
6.717e-08
d
yr
n .2290888096517102 3.5767e-09 deg/d
Q 3.057683576164091 3.1826e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      839  
   data-arc span      12400 days (33.95 yr)  
   first obs. used      1981-02-12  
   last obs. used      2015-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49071  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 13:23:18  

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 13.3 mag n/a MPO319192  

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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