Determine the absolute stellar magnitude of Castor (a Gemini) if its apparent stellar magnitude is 2 and the distance to it is 13 pc.

bystudin | November 15, 2020 | Education

Let’s use the formula M = m + 5-5lg D; substitute the values of M = m + 5 – 5lg 13; M = 2 + 5 – 5lgl3; M = +1.5.

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