(991) McDonalda
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 .