| Name | |
|---|---|
| Name | McDonalda |
| Designation | 1922 NB |
| Discovery | |
| Discoverer | O. Struve |
| Discovery date | October 24, 1922 |
| Discovery site | Williams Bay |
| Orbital elements | |
| Epoch August 18, 2005 (JDCT 2453600.5) | |
| Eccentricity (e) | 0.149 |
| Semimajor axis (a) | 3.150 AU |
| Perihelion (q) | 2.680 AU |
| Aphelion (Q) | 3.619 AU |
| Orbital period (P) | 5.590 a |
| Inclination (i) | 2.077° |
| Longitude of the ascending node (Ω) | 63.394° |
| Argument of Perihelion (ω) | 254.387° |
| Mean anomaly (M) | 5.949° |
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]
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