Distance index
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The difference between the apparent magnitude and absolute magnitude of a celestial body is used to express the distance to the celestial body. If the apparent magnitude is m, the absolute magnitude is M, and the distance to the celestial body in parsecs is r, then the relationship is m-M = -5.0 + 5.0log 1 (/0)r. Source : Heibonsha Encyclopedia About MyPedia Information |
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天体の見かけの等級と絶対等級の差のことで，天体までの距離を表すのに用いられる。見かけの等級をm，絶対等級をM，パーセクで表した天体の距離をrとすると，m−M＝−5.0＋5.0log1(/0)rの関係がある。
出典 株式会社平凡社百科事典マイペディアについて 情報 |
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