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9159 McDonnell (1984 UD3)
Classification: Main-belt Asteroid          SPK-ID: 2009159
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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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.

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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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1152012810119082 7.2802e-08  
a 2.345119826431457 1.4849e-08 au
q 2.07495901830013 1.6828e-07 au
i 6.400720518102535 6.9552e-06 deg
node 207.5744377552174 5.2867e-05 deg
peri 183.6467687091928 5.9679e-05 deg
M 304.1546614357284 3.0093e-05 deg
tp 2457803.984068238186
0.00011059 JED
period 1311.73463084013
n .2744457541457374 2.6066e-09 deg/d
Q 2.615280634562785 1.656e-08 au
  Orbit Determination Parameters
   # obs. used (total)      919  
   data-arc span      22399 days (61.33 yr)  
   first obs. used      1954-04-08  
   last obs. used      2015-08-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52001  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:26:59  

Additional Information
 Earth MOID = 1.07899 au 
 Jupiter MOID = 2.80326 au 
 T_jup = 3.544 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.8 mag n/a MPO279612  

9159 McDonnell           Discovered 1984 Oct. 26 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
J. A. M. ("Tony") McDonnell (b. 1938) is recognized for his research on cosmic dust. With colleagues, he was the first to demonstrate the intact capture of space particulates in aerogel. He has flown instruments on a number of missions and has analyzed impact craters on lunar samples and satellite surfaces exposed to space.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000523/MPCPages.arcLast Updated: 2013-03-29

Alternate Designations
 1984 UD3 = 1991 PR11 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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