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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1149557683225443 6.3399e-08  
a 2.278570031990528 8.1918e-09 AU
q 2.016635263286332 1.4516e-07 AU
i 2.324654672000573 7.1345e-06 deg
node 27.69920904699023 0.00015299 deg
peri 305.6504178449595 0.00015578 deg
M 239.2187005607684 3.4628e-05 deg
tp 2457221.991863688147
(2015-Jul-18.49186369)
0.00012189 JED
period 1256.296062653937
3.44
6.7748e-06
1.855e-08
d
yr
n .286556657066565 1.5453e-09 deg/d
Q 2.540504800694723 9.1335e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      742  
   data-arc span      22118 days (60.56 yr)  
   first obs. used      1953-09-17  
   last obs. used      2014-04-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54674  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Apr-17 13:57:07  

Additional Information
 Earth MOID = 1.00627 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 15.1 mag n/a MPO253432  

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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