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JPL Small-Body Database Browser
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9526 Billmckinnon (1981 EC13)
Classification: Main-belt Asteroid          SPK-ID: 2009526
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

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 two-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 is not working, here are some notes that might help.
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02560263971182746 4.6474e-08  
a 2.919307833561778 1.9837e-08 au
q 2.84456584689118 1.3985e-07 au
i 6.565321435814266 4.9937e-06 deg
node 310.0815214628783 4.4348e-05 deg
peri 282.7444887436433 0.0001106 deg
M 261.4757872196708 0.00010294 deg
tp 2459499.107421626763
0.0005217 TDB
period 1821.873697035744
n .1975987691055276 2.014e-09 deg/d
Q 2.994049820232375 2.0345e-08 au
  Orbit Determination Parameters
   # obs. used (total)      950  
   data-arc span      14314 days (39.19 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5196  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 03:12:11  

Additional Information
 Earth MOID = 1.8414 au 
 Jupiter MOID = 2.03585 au 
 T_jup = 3.270 
[ 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 14.5   n/a MPO381339  

9526 Billmckinnon           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring.
William B. McKinnon (b. 1954) is a professor of planetary science at Washington University in St. Louis. His research focuses on the physics of impact cratering for surfaces of rocky and icy bodies, ranging from the Jovian satellite system to the Kuiper Belt.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-07-12Last Updated: 2014-08-13
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Jun-05 17:02 UT
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