(9689) Freudenthal
Asteroid (9689) Freudenthal |
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Properties of the orbit ( animation ) | |
Orbit type | Main belt asteroid |
Major semi-axis | 2.6103 AU |
eccentricity | 0.1522 |
Perihelion - aphelion | 2.2131 AU - 3.0074 AU |
Inclination of the orbit plane | 13.4567 ° |
Length of the ascending node | 11.9266 ° |
Argument of the periapsis | 109.4916 ° |
Sidereal period | 4.22 a |
Mean orbital velocity | 18.44 km / s |
Physical Properties | |
Medium diameter | 3.743 (± 0.585) km |
Albedo | 0.219 (± 0.062) |
Absolute brightness | 14.6 mag |
history | |
Explorer |
Cornelis Johannes van Houten , Ingrid van Houten-Groeneveld , Tom Gehrels |
Date of discovery | September 24, 1960 |
Another name | 4831 PL , 2013 T-3 |
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. |
(9689) Freudenthal 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 mathematician and science didactic Hans Freudenthal (1905-1990), who wrote several books on mathematics didactics and in 1937 published his suspension theorems ( suspension theorems ) for topological spaces.
See also
Web links
- (9689) Freudenthal in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (9689) Freudenthal 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 by (9689) Freudenthal according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics in Cambridge , Massachusetts (English)