(991) McDonalda
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Asteroid (991) McDonalda |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main belt asteroid |
| Asteroid family | Themis family |
| Major semi-axis | 3.1498 AU |
| eccentricity | 0.1491 |
| Perihelion - aphelion | 2.6803 AU - 3.6193 AU |
| Inclination of the orbit plane | 2.077 ° |
| Sidereal period | 5,590 a |
| Mean orbital velocity | 16.78 km / s |
| Physical Properties | |
| Medium diameter | 31.40 km |
| Albedo | 0.064 |
| Rotation period | ? H |
| Absolute brightness | 11,073 mag |
| Spectral class | ? |
| history | |
| Explorer | Otto von Struve |
| Date of discovery | 1922 |
| Another name | 1922 NB, 1949 PF, 1950 WG |
| 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. | |
(991) McDonalda is an asteroid of the main belt , which on 24 October 1922 by Russian-American astronomer Otto Struve at Yerkes Observatory in Wisconsin was discovered.
The asteroid was named after the McDonald Observatory in Texas , USA .