Task: Question Generation
Input (English): Context : It has an absolute magnitude of -9.2, which translates to a total luminosity of 360,000 times that of the Sun. Messier 15 is one of the most densely packed globulars known in the Milky Way galaxy. 
Subject : Messier 15 
Relation : constellation
Output (English): The star Messier 15 is a part of the constellation named what?