Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .114958829823109 5.9235e-08  
a 2.278854978770454 1.2188e-08 AU
q 2.016880477074437 1.3582e-07 AU
i 2.324499259589639 6.9142e-06 deg
node 27.69771504440829 0.00014187 deg
peri 305.5885004022683 0.00014514 deg
M 296.5909118553083 3.6017e-05 deg
tp 2457221.820919952083
(2015-Jul-18.32091995)
0.00012664 JED
period 1256.531729346746
3.44
1.0081e-05
2.76e-08
d
yr
n .2865029124152393 2.2985e-09 deg/d
Q 2.540829480466472 1.359e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      758  
   data-arc span      22187 days (60.74 yr)  
   first obs. used      1953-09-17  
   last obs. used      2014-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50929  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:22:21  

Additional Information
 Earth MOID = 1.00831 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2014-Sep-22 06:12 UT
(server date/time)  
NASA Home Page
Site Manager:   Donald K. Yeomans
Webmaster  Alan B. Chamberlin