Over the next week Mars continues its eastward ‘march’ and will pass by two globular star clusters, coming within about 0.20o from M-28 on 2-3 November, and about 1o from M-22 on the 6th. This animated graphic is set to 1-day intervals and starts on October 27th and ends on November 9th. Globular cluster M-28 has an apparent magnitude of 8.5 and is estimated to be 19000 light years distant, in Sagittarius. Also in Sagittarius is globular cluster M-22 at a distance of 10000 light years with an apparent magnitude 6.5.
A globular star cluster is a compact group of stars numbering in the tens of thousands to a few million. Round in appearance globular star clusters are mostly located in the galaxy’s halo, a spherical area around the galaxy center where the older stars in the galaxy are located. Globular clusters contain the oldest stars in the galaxy.
Click here to go to the Qué tal in the Current Skies web site for more observing information for this month.