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8456 Davegriep (1981 EJ7)
Classification: Main-belt Asteroid          SPK-ID: 2008456
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03517353819582159 7.3497e-08  
a 3.164924284133248 3.6226e-08 AU
q 3.053602698938404 2.3055e-07 AU
i 7.822976899488817 6.8167e-06 deg
node 307.1949832172543 4.8172e-05 deg
peri 27.88797161706152 0.00010197 deg
M 199.7150060120122 8.9953e-05 deg
tp 2457916.159020893267
(2017-Jun-11.65902089)
0.00051382 JED
period 2056.569609668389
5.63
3.5309e-05
9.667e-08
d
yr
n .1750487794371561 3.0054e-09 deg/d
Q 3.276245869328092 3.75e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1018  
   data-arc span      12166 days (33.31 yr)  
   first obs. used      1981-02-02  
   last obs. used      2014-05-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5285  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:39:50  

Additional Information
 Earth MOID = 2.0454 AU 
 T_jup = 3.188 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.6 mag n/a MPO256926  

8456 Davegriep           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
David M. Griep (b. 1957) has been a telescope operator for the NASA Infrared Telescope Facility on Mauna Kea since 1982. His expertise and dedication to observers have helped facilitate observations used in hundreds of planetary research projects.
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

[ show close-approach data ]
Alternate Designations
 1981 EJ7 = 1992 GP1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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