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Variables in Messier 5

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About this observation
Observer
Nick Hewitt
Time of observation
13/05/2020 - 23:06
Object
Messier 5
Observing location
Northampton
Equipment
Celestron 925 EdgeHD at F7
EQ8
Canon 60Da
Exposure
20 x 60s ISO1000

Just over 100 years ago, on 26th April 1920,Harlow Shapley and Heber Curtis "debated" the Scale of the Universe. Shapley had measured the distances to many globular clusters by a variety of means, one of which was a study of Cepheids within the globulars containing them. Messier 5 is one, with two prominent variables that could still be of interest to amateurs. V42 is a Cepheid, varying between 10.5 and 12. V 84 is an RV Tauri star that ranges 10.85-12.25. V50 is a semiregular variable and quite faint here. There are some super animations on the web: search vanerbei.princeton.edu and Messier 5.

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