noun
third magnitude star
Astronomical term for a star with an apparent magnitude around 3.0, visible to the naked eye under good conditions.
今夜は三等星までよく見える。
Tonight you can see stars down to third magnitude clearly.
Standard kanji spelling for 'third magnitude star'.
Numerical variant using Arabic numeral 3, common in technical or abbreviated contexts.
Compound of 三等 (third class/rank) + 星 (star). The magnitude scale originates from ancient Greek astronomy, later formalized by modern astronomers.