(21659) Fredholm
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Asteroid (21659) Fredholm |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main belt asteroid |
| Major semi-axis | 2.5724 AU |
| eccentricity | 0.1470 |
| Perihelion - aphelion | 2.1942 AU - 2.9507 AU |
| Inclination of the orbit plane | 4.8871 ° |
| Length of the ascending node | 46.8148 ° |
| Argument of the periapsis | 260.5174 ° |
| Sidereal period | 4.13 a |
| Mean orbital velocity | 18.56 km / s |
| Physical Properties | |
| Absolute brightness | 14.6 mag |
| history | |
| Explorer | Paul G. Comba |
| Date of discovery | August 13, 1999 |
| Another name | 1999 PR 3 , 1995 UH 26 , 1998 HV 43 |
| 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. | |
(21659) Fredholm is an asteroid of the main belt , which on 13 August 1999 by the American Italo- astronomer Paul G. Comba at Prescott Observatory ( IAU code in 684) Arizona was discovered.
The asteroid was named on May 9, 2001 after the Swedish mathematician Erik Ivar Fredholm (1866-1927), who taught at Stockholm University and in 1903 founded the modern theory of integral equations .
See also
Web links
- Asteroid Fredholm: Discovery Circumstances according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics, Cambridge, USA
- (21659) Fredholm in the Small-Body Database of the Jet Propulsion Laboratory (English).
- (21659) Fredholm in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).