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11427 Willemkolff (2611 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2011427
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09471397628122921 5.3622e-08  
a 3.163922319755184 3.0309e-08 au
q 2.864254656206239 1.839e-07 au
i 5.470822323374127 6.3287e-06 deg
node 178.7116877462969 4.9823e-05 deg
peri 131.0393372310178 5.8712e-05 deg
M 12.56848352688736 3.2799e-05 deg
tp 2457528.734200954894
0.00018696 JED
period 2055.593071428932
n .1751319388081749 2.5165e-09 deg/d
Q 3.463589983304128 3.3179e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1255  
   data-arc span      20047 days (54.89 yr)  
   first obs. used      1960-09-24  
   last obs. used      2015-08-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49429  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Oct-28 16:24:04  

Additional Information
 Earth MOID = 1.85343 au 
 Jupiter MOID = 1.78575 au 
 T_jup = 3.190 
[ 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 13.0 mag n/a MPO344394  

11427 Willemkolff           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld at Leiden on Palomar Schmidt plates taken by T. Gehrels.
Born in Leiden, Willem Johan Kolff (b. 1911) invented the first kidney dialysis machine while working in harsh conditions in Kampen during World War II. After the war he moved to the U.S. and in 1967 became professor of surgery at the University of Utah, working with his student Robert Jarvik on an artificial heart.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070926/MPCPages.arcLast Updated: 2007-09-30

[ show close-approach data ]
Alternate Designations
 2611 P-L = 1998 KR3 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-Apr-30 22:34 UT
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