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20468 Petercook (1999 NK4)
Classification: Main-belt Asteroid          SPK-ID: 2020468
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .238026378232388 4.3953e-08  
a 3.179056773862807 2.3837e-08 au
q 2.422357403785103 1.3792e-07 au
i 1.961505653081454 5.0875e-06 deg
node 52.56750219817242 0.00014866 deg
peri 274.8464911598101 0.00014916 deg
M 221.3835090663937 1.5875e-05 deg
tp 2459797.683410708942
(2022-Aug-06.18341071)
9.8339e-05 TDB
period 2070.359925592679
5.67
2.3285e-05
6.375e-08
d
yr
n .1738828092400133 1.9557e-09 deg/d
Q 3.93575614394051 2.951e-08 au
  Orbit Determination Parameters
   # obs. used (total)      788  
   data-arc span      9306 days (25.48 yr)  
   first obs. used      1994-10-26  
   last obs. used      2020-04-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57985  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 05:12:44  

Additional Information
 Earth MOID = 1.41193 au 
 Jupiter MOID = 1.42891 au 
 T_jup = 3.154 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5   n/a MPO337431  
diameter diameter 7.943 km 0.217 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.049   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20468 Petercook           Discovered 1999 July 13 by J. Broughton at Reedy Creek.
British comedy writer and performer Peter E. Cook (1937-1995) was the prime instigator of the new genre of satirical sketch comedy with his 1960's revue Beyond The Fringe. His most famous sketch included diminutive Dudley Moore as an ever hopping one-legged man auditioning for the role of Tarzan!
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050407/MPCPages.arcLast Updated: 2005-04-15

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