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3894 Williamcooke (1980 PQ2)
Classification: Main-belt Asteroid          SPK-ID: 2003894
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1712131779305668 1.7098e-08  
a 2.626664596177404 1.1262e-08 au
q 2.176945003308162 4.379e-08 au
i 13.35763795410883 6.6894e-07 deg
node 163.0480167317074 2.7704e-06 deg
peri 188.2777651037599 6.3152e-06 deg
M 159.1018561207482 5.2993e-06 deg
tp 2458513.307987285903
2.0055e-05 TDB
period 1554.910361255133
n .2315246003695067 1.4891e-09 deg/d
Q 3.076384189046646 1.3191e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2817  
   data-arc span      15724 days (43.05 yr)  
   first obs. used      1978-03-06  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40042  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:17:23  

Additional Information
 Earth MOID = 1.16977 au 
 Jupiter MOID = 2.35715 au 
 T_jup = 3.343 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.16   n/a MPCxxxxx  
diameter diameter 8.778 km 0.078 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 4.16 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Stephens, R.D.; Warner, B.D. (2019) Minor Planet Bull. 45, 66-71.]
geometric albedo albedo 0.357   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

3894 Williamcooke           Discovered 1980 Aug. 14 by P. Jekabsons and M. P. Candy at the Perth Observatory.
Named in memory of William Ernest Cooke (1863-1947), government astronomer for Western Australia during 1896-1912 and first director of the Perth Observatory. His astronomical expertise and willingness to engage in international collaboration paved the way for the establishment of the Observatory and led to its involvement with the `Carte du Ciel' project and the acquisition of all the plates for the declination zone - 31{\degi} and - 41{\degi}. During 1912-1926 Cooke was government astronomer for New South Wales, and he remains the only Sydney Observatory director to hold the post of professor of astronomy at Sydney University at the same time. Name suggested and citation provided by J. Biggs and P. Birch.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19960828/MPCPages.arcLast Updated: 2003-09-26

Alternate Designations
 1980 PQ2 = 1978 EM4 = 1980 RF3 = 1987 DY6 = 1989 WM6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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