(1686) De Sitter
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Asteroid (1686) De Sitter |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main belt asteroid |
| Asteroid family | Themis family |
| Major semi-axis | 3.1567 AU |
| eccentricity | 0.1667 |
| Perihelion - aphelion | 2.6306 AU - 3.6829 AU |
| Inclination of the orbit plane | 0.625 ° |
| Sidereal period | 5.609 a |
| Mean orbital velocity | 16.76 km / s |
| Physical Properties | |
| Medium diameter | 32.92 km |
| Dimensions | ? kg |
| Albedo | 0.065 |
| Medium density | ? g / cm³ |
| Rotation period | ? H |
| Absolute brightness | 10,981 mag |
| Spectral class | ? |
| history | |
| Explorer | H. van Gent |
| Date of discovery | September 28, 1935 |
| Another name | 1935 SR 1 , 2929 RK 1 , 1933 GF |
| 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. | |
(1686) De Sitter is an asteroid of the main belt that was discovered on September 28, 1935 by the Dutch astronomer Hendrik van Gent in Johannesburg .
The asteroid was named after the Dutch astronomer Willem de Sitter .