The brightest and most easily observed variable in M5 varies from magnitude 10.6 to 12.1 in a period of just under 26.5 days.

It is a variable star and its brightness varies from magnitude +3.55 to +3.67 with a period of 2.78 days.

This allows the object's distance to be measured from its actual observed brightness, or apparent magnitude.

The brightness of the binary varies from magnitude +5.8 to +6.40 with a period of 6.43 hours.

Its brightness varies from magnitude +3.92 to +4.14 with a period of 17.77 days.

Its brightness varies from magnitude +4.84 to +5.33 with a period of 4.39 days.

Over a period of 78.5 days its brightness can vary from magnitude +9.5 to +13.5.

During each cycle, the brightness of the star varies from apparent magnitude +2.29 to +2.31.

From the brightness and magnitude, it had an O-type star.

It is classified as a Mira variable and its brightness varies from magnitude +5.3 to +11.8 with a period of 546.2 days.