991 McDonalda

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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
0.1768 deg / yr
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[edit]

  1. ^ Lutz D. Schmadel, Dictionary of Minor Planet Names: Addendum to Fifth Edition: 2006 - 2008.

External links[edit]