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11243 de Graauw (2157 T-1)
Classification: Main-belt Asteroid          SPK-ID: 2011243
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1172965666652794 5.5227e-08  
a 2.7818752360181 2.3639e-08 AU
q 2.455570821942014 1.5104e-07 AU
i 3.693142970349306 5.5672e-06 deg
node 163.1952112897767 8.7559e-05 deg
peri 246.4504417737524 9.1842e-05 deg
M 231.9306924132178 2.6813e-05 deg
tp 2457403.403021405310
(2016-Jan-15.90302141)
0.00012978 JED
period 1694.747100579408
4.64
2.1602e-05
5.914e-08
d
yr
n .2124210744345994 2.7076e-09 deg/d
Q 3.108179650094188 2.6412e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1153  
   data-arc span      15464 days (42.34 yr)  
   first obs. used      1971-03-24  
   last obs. used      2013-07-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54049  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-26 19:40:49  

Additional Information
 Earth MOID = 1.4674 AU 
 T_jup = 3.320 
[ 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 13.4 mag n/a PDS3 (MPC 35274)  

11243 de Graauw           Discovered 1971 Mar. 25 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Dutch astronomer Matthijs W. M. de Graauw (b. 1942) is known for his tireless enthusiasm in pushing Dutch and European infrared and submillimeter astronomy forward, both on the ground and in space.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070730/MPCPages.arcLast Updated: 2007-08-07

[ show close-approach data ]
Alternate Designations
 2157 T-1 = 1987 SQ28 = 1999 FE35 = 4623 T-1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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