If RR Lyrae stars in a globular cluster had an apparent magnitude of 12 and an absolute magnitude of 0.5,what would the globular cluster's distance be?

Question

Quizplus · Accepted Answer

The distance modulus is the difference between the apparent magnitude and the absolute magnitude. In this case, the distance modulus is 12 - 0.5 = 11.5. The distance in parsecs is then 10^(distance modulus/5) = 10^(11.5/5) = 32,000 parsecs. Converting to light-years, we get 32,000 * 3.26 = 104,960 light-years.

If RR Lyrae Stars in a Globular Cluster Had an Apparent