(2157) Ashbrook
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Asteroid (2157) Ashbrook |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main belt asteroid |
| Asteroid family | Gefion family |
| Major semi-axis | 2.7822 AU |
| eccentricity | 0.1131 |
| Perihelion - aphelion | 2.4674 AU - 3.0970 AU |
| Inclination of the orbit plane | 8.6339 ° |
| Length of the ascending node | 349.4765 ° |
| Argument of the periapsis | 265.5579 ° |
| Sidereal period | 4.64 a |
| Mean orbital velocity | 17.85 km / s |
| Physical Properties | |
| Medium diameter | approx. 13 km |
| Absolute brightness | 12.0 mag |
| Spectral class | SMASSII: S. |
| history | |
| Explorer | K. Reinmuth |
| Date of discovery | March 7, 1924 |
| Another name | A924 EF , 1952 FF 1 , 1957 JD 1 , 1970 ED, 1975 EG 1 |
| 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. | |
(2157) Ashbrook is an asteroid of the main belt that was discovered on March 7, 1924 by the German astronomer Karl Wilhelm Reinmuth at the State Observatory in Heidelberg-Königstuhl ( IAU code 024) in Heidelberg .
The asteroid may belong to the Gefion family, an asteroid family named after (1272) Gefion .
(2157) Ashbrook was named after the American astronomer Joseph Ashbrook (1918–1980) who determined the period of rotation of Mars by evaluating old records to within a few thousandths of a second and who, as editor of the monthly magazine Sky and Telescope, provided an important source of information for all astronomers .
See also
Web links
- Asteroid Ashbrook: Discovery Circumstances according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics, Cambridge, USA
- (2157) Ashbrook in the Small-Body Database of the Jet Propulsion Laboratory .
- (2157) Ashbrook in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).