A supernova was discovered in the galaxy with a magnitude of 15.0 at its maximum magnitude. Determine the distance to the galaxy

A supernova was discovered in the galaxy with a magnitude of 15.0 at its maximum magnitude. Determine the distance to the galaxy, assuming that the absolute stellar magnitude of the supernova was M = -15.0.

decision
M = m + 5 – 51gD; lgD = (m + 5 – M) / 5; lgD = (15 + 5 + 15) / 5 = 7; D = 10 ^ 7 (pc) = 10 (Mpc).

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