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9491 Thooft (1205 T-1)
Classification: Main-belt Asteroid          SPK-ID: 2009491
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 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1337936608438985 5.9883e-08  
a 2.21394138986712 1.0706e-08 au
q 1.917730066422969 1.3101e-07 au
i 5.050098920235222 5.9973e-06 deg
node 350.3850585187488 6.3584e-05 deg
peri 263.4651961939188 6.8111e-05 deg
M 218.863914329604 2.55e-05 deg
tp 2458072.218787696658
8.5316e-05 JED
period 1203.227103572825
n .2991953879122463 2.1702e-09 deg/d
Q 2.51015271331127 1.2138e-08 au
  Orbit Determination Parameters
   # obs. used (total)      851  
   data-arc span      16431 days (44.99 yr)  
   first obs. used      1971-03-24  
   last obs. used      2016-03-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5247  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 16:03:29  

Additional Information
 Earth MOID = .911198 au 
 Jupiter MOID = 2.54105 au 
 T_jup = 3.638 
[ 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 15.0 mag n/a MPO358722  

9491 Thooft           Discovered 1971 Mar. 25 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Gerardus 't Hooft (b. 1946) is professor of physics at University of Utrecht. Together with his colleague M. J. G. Veltman he won the 1999 Nobel Prize in physics, awarded for placing the theory of particle physics on a firmer mathematical foundation and for elucidating the quantum structure of electroweak interactions.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000320/MPCPages.arcLast Updated: 2013-03-29

[ show close-approach data ]
Alternate Designations
 1205 T-1 = 1997 CR4 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-May-04 06:02 UT
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