On May 13, 2017, an amateur astronomer discovered a supernova in the galaxy NGC 6946. The galaxy is located at a distance of 22 million light years. Estimate what apparent magnitude the supernova had at its maximum brightness, if it was of the second type.
M = m + 5-51gD, m = M-5 + 51gD, m = -15-5 + 51g6.74 * 10 ^ 6 = -20 + 31, m = + ll.
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