Alpha Cru
HIP 60718; Alpha2 Cru
천체 데이터
- 카탈로그 지정명
- HIP 60718; Alpha2 Cru
- 유형
- DoubleStar
- 별자리
- Cru
- 등급
- 1.73
- 적경
- 12h 26m 36.5s
- 적위
- -63° 05' 58.0"
- 거리
- 321 광년
- HR
- 4731
- HIP
- 60718
- Bayer
- Alpha2
서베이 이미지
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Alpha Cru 소개
설명
Alpha Crucis B is the fainter component of the Acrux double star system at magnitude 1.73, a blue main-sequence star of spectral type B1V. Together with the brighter A component, it forms one of the finest visual double stars in the southern sky. The B component has a luminosity of about 16,000 times solar.
관측 팁
Resolved in a small telescope at moderate magnification as the fainter companion to Acrux A, separated by about 4 arcseconds. The pair appears as two brilliant blue-white points, nearly equal in brightness. This is one of the most rewarding double stars accessible from the southern hemisphere. Best observed March through June.
역사
The double nature of Acrux was first noted by Jesuit missionary Jean Richaud while observing a comet from Pondicherry, India in 1685. It was one of the first double stars discovered in the southern sky and remains one of the showpiece objects for southern hemisphere observers.
재미있는 사실
The two components of Acrux are among the nearest pair of B-type giants to Earth that can be resolved visually. The system may actually contain additional components, making it a quadruple or even quintuple star system.