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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1149378517689464 5.8862e-08  
a 2.278861558098916 8.758e-09 au
q 2.016934106132193 1.3431e-07 au
i 2.324507458747008 6.4705e-06 deg
node 27.69329786641157 0.00012196 deg
peri 305.4958746307054 0.0001242 deg
M 51.26811854311669 2.3196e-05 deg
tp 2457221.554731566532
(2015-Jul-18.05473157)
8.0973e-05 JED
period 1256.537170988062
3.44
7.2435e-06
1.983e-08
d
yr
n .286501671667157 1.6516e-09 deg/d
Q 2.540789010065639 9.7646e-09 au
  Orbit Determination Parameters
   # obs. used (total)      923  
   data-arc span      22729 days (62.23 yr)  
   first obs. used      1953-09-17  
   last obs. used      2015-12-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50618  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:11:35  

Additional Information
 Earth MOID = 1.00573 au 
 Jupiter MOID = 2.75534 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 2016-Feb-10 04:41 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin