Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1559145797353265 8.0494e-08  
a 2.645250457710044 2.6874e-08 AU
q 2.232817344301502 2.107e-07 AU
i 10.44556035226307 8.4401e-06 deg
node 9.568815349335132 3.5593e-05 deg
peri 319.2419110923474 4.5072e-05 deg
M 168.7100189304972 3.5778e-05 deg
tp 2456264.060630409880
(2012-Dec-02.56063041)
0.00015077 JED
period 1571.44296902523
4.30
2.3947e-05
6.556e-08
d
yr
n .2290888101547261 3.4911e-09 deg/d
Q 3.057683571118586 3.1064e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      921  
   data-arc span      12428 days (34.03 yr)  
   first obs. used      1981-02-12  
   last obs. used      2015-02-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .47286  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:13:56  

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2015-Apr-02 03:11 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin