(9686) Keesom

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Asteroid
(9686) Keesom
Properties of the orbit ( animation )
Epoch:  4th September 2017 ( JD 2,458,000.5)
Orbit type Main belt asteroid
Major semi-axis 2.2795  AU
eccentricity 0.1144
Perihelion - aphelion 2.0187 AU - 2.5403 AU
Inclination of the orbit plane 2.3241 °
Length of the ascending node 27.6994 °
Argument of the periapsis 305.3912 °
Sidereal period 3.44 a
Mean orbital velocity 19.73 km / s
Physical Properties
Medium diameter 2.313 (± 0.340) km
Albedo 0.250 (± 0.109)
Absolute brightness 15.3 mag
history
Explorer Cornelis Johannes van Houten ,
Ingrid van Houten-Groeneveld ,
Tom Gehrels
Date of discovery September 24, 1960
Another name 4604 PL , 1953 SQ, 1991 RL 41
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(9686) Keesom is an asteroid of the main belt that was discovered on September 24, 1960 by the Dutch astronomer couple Cornelis Johannes van Houten and Ingrid van Houten-Groeneveld . The discovery came about as part of the Palomar-Leiden survey , during which Tom Gehrels examined field plates recorded at the University of Leiden with the 120 cm Oschin Schmidt telescope of the Palomar observatory .

The asteroid was named on July 5, 2001 after the Dutch physicist Willem Hendrik Keesom (1876-1956), who worked in the field of low-temperature physics and from 1923 held a professorship for experimental physics at the University of Leiden as the successor to Heike Kamerlingh Onnes .

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