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6906 Johnmills (1990 WC)
Classification: Main-belt Asteroid          SPK-ID: 2006906
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 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .272486413028612 9.5419e-08  
a 2.737483766411268 2.3202e-08 AU
q 1.991556634177807 2.5732e-07 AU
i 10.44708424085552 8.7787e-06 deg
node 68.16990880450746 4.8587e-05 deg
peri 347.1709945769845 5.1093e-05 deg
M 95.80301492471705 1.6328e-05 deg
tp 2456560.246891253170
(2013-Sep-24.74689125)
7.3868e-05 JED
period 1654.343751847503
4.53
2.1032e-05
5.758e-08
d
yr
n .2176089459025471 2.7666e-09 deg/d
Q 3.483410898644729 2.9524e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      617  
   data-arc span      15368 days (42.08 yr)  
   first obs. used      1972-12-02  
   last obs. used      2014-12-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51638  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 00:18:53  

Additional Information
 Earth MOID = 1.00466 AU 
 T_jup = 3.273 
[ 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 13.1 mag n/a MPO279587  
SMASSII spectral type spec_B C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

6906 Johnmills           Discovered 1990 Nov. 19 by R. H. McNaught at Siding Spring.
John Mills (1806-1899), twine manufacturer and amateur astronomer, left funds for the creation of Britain's first public observatory. The Mills Observatory in his home town of Dundee was eventually built in 1935.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070106/MPCPages.arcLast Updated: 2007-01-09

[ show close-approach data ]
Alternate Designations
 1990 WC = 1972 XK = 1978 EA4 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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