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9491 Thooft (1205 T-1)
Classification: Main-belt Asteroid          SPK-ID: 2009491
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer 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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1335416898815038 3.0895e-08  
a 2.214658121596774 6.9002e-09 au
q 1.918908933528944 6.8239e-08 au
i 5.048345607618605 3.9973e-06 deg
node 350.3506121926632 3.6887e-05 deg
peri 263.603938358215 4.0109e-05 deg
M 35.93498757599004 1.7312e-05 deg
tp 2459276.336252178480
(2021-Mar-02.83625218)
5.7747e-05 TDB
period 1203.811442101369
3.30
5.6261e-06
1.54e-08
d
yr
n .2990501563696599 1.3976e-09 deg/d
Q 2.510407309664604 7.8217e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1624  
   data-arc span      18351 days (50.24 yr)  
   first obs. used      1971-03-24  
   last obs. used      2021-06-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49247  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 02:00:54  

Additional Information
 Earth MOID = .912643 au 
 Jupiter MOID = 2.5416 au 
 T_jup = 3.638 
[ 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 15.03   n/a MPO614063  
diameter diameter 2.236 km 0.611 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.268   0.139 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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

Alternate Designations
 1205 T-1 = 1997 CR4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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