(9686) Keesom
Asteroid (9686) Keesom |
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Properties of the orbit ( animation ) | |
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 .
See also
Web links
- (9686) Keesom in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (9686) Keesom in the Small-Body Database of the Jet Propulsion Laboratory of NASA at the California Institute of Technology (Caltech) in Pasadena , California (English)
- Discovery Circumstances of (9686) Keesom according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics in Cambridge , Massachusetts (English)