also: アルクトゥールス · アークトウルス
noun
Arcturus; Alpha Boötis
The brightest star in the constellation Boötes, a red giant. Used in astronomical contexts.
アルクトゥルスは春の夜空で見つけやすい恒星です。
Arcturus is a star that is easy to find in the spring night sky.
Most common katakana rendering of Arcturus.
Variant with long vowel, reflecting the Latinized form.
Less common variant; may appear in older astronomical texts.
From English Arcturus, ultimately from Ancient Greek Ἀρκτοῦρος (Arktouros), meaning 'guardian of the bear', referring to its proximity to Ursa Major.