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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .008817225611677582 5.4931e-08  
a 2.814495080912154 2.4028e-08 AU
q 2.789679042800794 1.5599e-07 AU
i 6.05345533095127 7.539e-06 deg
node 15.66526403362533 5.814e-05 deg
peri 78.45303738168111 0.00051705 deg
M 82.50608436957279 0.00051058 deg
tp 2456605.240202703097
(2013-Nov-08.74020270)
0.0024473 JED
period 1724.642832272877
4.72
2.2085e-05
6.047e-08
d
yr
n .2087388723412153 2.673e-09 deg/d
Q 2.839311119023513 2.424e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      868  
   data-arc span      23067 days (63.15 yr)  
   first obs. used      1951-12-01  
   last obs. used      2015-01-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50359  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 13:26:53  

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 13.7 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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