- 991 McDonalda
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991 McDonalda 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]
References
- ^ Lutz D. Schmadel, Dictionary of Minor Planet Names: Addendum to Fifth Edition: 2006 - 2008.
External links
- NASA JPL Small-Body Database Browser on 991 McDonalda
- Discovery Circumstances: Numbered Minor Planets
Minor planets navigator Small Solar System bodies Minor planets - Designation
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Comets Meteoroids Lists / categories - Asteroid groups and families
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Categories:- Themistian asteroids
- Astronomical objects discovered in 1922
- Struve family
- C-type Main Belt asteroid stubs
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