991 McDonalda
| Discovery | |
|---|---|
| Discovered by | O. Struve |
| Discovery site | Williams Bay |
| Discovery date | October 24, 1922 |
| Designations | |
| 1922 NB, 1949 PF, 1950 WG, 1953 GT1, 1975 EE6 | |
| Orbital characteristics | |
| Epoch August 18, 2005 (JDCT 2453600.5) | |
| Aphelion | 3.619 AU |
| Perihelion | 2.680 AU |
| 3.150 AU | |
| Eccentricity | 0.149 |
| 5.590 yr | |
| 5.949° | |
| Inclination | 2.077° |
| 63.394° | |
| 254.387° | |
| Proper orbital elements | |
Proper mean motion | 0.1768 deg / yr |
Proper orbital period |
2036.1991 yr (743721.719 d) |
| Physical characteristics | |
| Dimensions | 31.41 km (19.52 mi) |
| Albedo | 0.0638 (geometric) |
| Temperature | 144-167 K |
Spectral type | C |
| 11.12 | |
|
| |
991 McDonalda is a Themistian asteroid. It was discovered by Otto Struve in 1922 at the Yerkes Observatory in Williams Bay, Wisconsin, USA. It is named after the McDonald Observatory, which Struve helped found in 1939.[1]
References
- ↑ Lutz D. Schmadel, Dictionary of Minor Planet Names: Addendum to Fifth Edition: 2006 - 2008.
External links
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