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9686 Keesom (4604 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2009686
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1149147530414967 5.8654e-08  
a 2.278586618296846 8.6976e-09 au
q 2.016743399771605 1.3374e-07 au
i 2.324505132238475 6.4571e-06 deg
node 27.69306537457846 0.00012028 deg
peri 305.4355083934271 0.00012255 deg
M 108.6363484510235 2.3162e-05 deg
tp 2457221.386369369974
(2015-Jul-17.88636937)
8.0848e-05 JED
period 1256.309780039589
3.44
7.1932e-06
1.969e-08
d
yr
n .2865535282139217 1.6407e-09 deg/d
Q 2.540429836822088 9.6971e-09 au
  Orbit Determination Parameters
   # obs. used (total)      935  
   data-arc span      22778 days (62.36 yr)  
   first obs. used      1953-09-17  
   last obs. used      2016-01-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50745  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 18:35:54  

Additional Information
 Earth MOID = 1.00682 au 
 Jupiter MOID = 2.75666 au 
 T_jup = 3.597 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.2 mag n/a MPO299033  

9686 Keesom           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Dutch physicist Willem Hendrik Keesom (1876-1956) specialized in cryogenics. In 1926 he became the first to solidify helium, and among his discoveries are He I and He II. In 1932 he achieved the temperature of -272° C, only one degree above absolute zero. 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

Alternate Designations
 4604 P-L = 1953 SQ = 1991 RL41 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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