991 McDonalda

Tags: Planet.

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.

apoapsis (km)

5.41395e+11

orbital period (μ)

1.76407e+08

periapsis (km)

4.00922e+11

absolute magnitude

11.12

albedo

0.0638

discovery date

1922-10-24

discoverer

Otto Struve

epoch

August 18 2005 (JDCT 2453600.5)

former name

1922 NB 1949 PF 1950 WG 1953 GT1 1975 EE6