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9687 Uhlenbeck (4614 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2009687
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .00849131291757441 5.031e-08  
a 2.814594181860071 2.1393e-08 au
q 2.790694581925913 1.3783e-07 au
i 6.053711865717669 7.3255e-06 deg
node 15.66061267122167 5.0428e-05 deg
peri 76.60210722791815 0.00047344 deg
M 209.6476081326381 0.00046971 deg
tp 2458320.827418265830
(2018-Jul-21.32741827)
0.0022499 JED
period 1724.733922453752
4.72
1.9664e-05
5.384e-08
d
yr
n .2087278479963063 2.3797e-09 deg/d
Q 2.83849378179423 2.1575e-08 au
  Orbit Determination Parameters
   # obs. used (total)      985  
   data-arc span      23185 days (63.48 yr)  
   first obs. used      1951-12-01  
   last obs. used      2015-05-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49392  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:06:13  

Additional Information
 Earth MOID = 1.80798 au 
 Jupiter MOID = 2.1462 au 
 T_jup = 3.311 
[ 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 13.7 mag n/a MPO324398  

9687 Uhlenbeck           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Together with Samuel A. Goudsmit, Dutch-American physicist George E. Uhlenbeck (1900-1988) proposed the concept of electron spin at the University of Leiden in 1925. Spin is a fundamental property of neutrons, protons and other elementary particles. The name was suggested by W. A. Fröger.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010705/MPCPages.arcLast Updated: 2009-05-11

[ show close-approach data ]
Alternate Designations
 4614 P-L = 1981 AL3 = 1991 FE4 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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