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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .008817232369087324 5.7146e-08  
a 2.814495078133135 2.4985e-08 AU
q 2.789679021027583 1.6416e-07 AU
i 6.053455296937511 7.5392e-06 deg
node 15.66525268611144 5.9836e-05 deg
peri 78.45310422123183 0.00053636 deg
M 82.50603011241695 0.00052918 deg
tp 2456605.240463216888
(2013-Nov-08.74046322)
0.0025367 JED
period 1724.642829718521
4.72
2.2965e-05
6.287e-08
d
yr
n .2087388726503768 2.7795e-09 deg/d
Q 2.839311135238688 2.5205e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      858  
   data-arc span      23034 days (63.06 yr)  
   first obs. used      1951-12-01  
   last obs. used      2014-12-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50513  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 00:30:54  

Additional Information
 Earth MOID = 1.80921 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 13.6 mag n/a MPO250306  

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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