(9689) Freudenthal

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Asteroid
(9689) Freudenthal
Properties of the orbit ( animation )
Epoch:  4th September 2017 ( JD 2,458,000.5)
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.

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