English Dictionary

Mira

固有名詞

(astronomy) A binary star in the constellation Cetus, Omicron (ο) Ceti. The system contains a variable red giant and a white dwarf. Its brightness varies from a magnitude 2 at its brightest to a magnitude 10 at its dimmest.

日本語の意味

ミラは、ケタス座（鯨座）に存在する連星系の名称で、変光性の赤色巨星と白色矮星から成り、明るさが極めて大きく変動する星として知られています。

Mira surprised observers by brightening from magnitude 10 to magnitude 2 over the course of a few weeks.

くじら座の連星オミクロン・ケティは数週間のうちに等級10から等級2まで明るくなり、観測者を驚かせた。

意味（1）

(astronomy) A binary star in the constellation Cetus, Omicron (ο) Ceti. The system contains a variable red giant and a white dwarf. Its brightness varies from a magnitude 2 at its brightest to a magnitude 10 at its dimmest.

The favoured explanation, adopted by Maraldi, was based on the assumption that the star was rotating and composed of two different parts, a bright and a dark region; if so, it might only be visible when the bright region turned towards Earth. Whatever the explanation, Mira had puzzled the astronomers because of its random character and the irregular periods between its observations.