Zuben Elgenubi
HIP 72622; Alpha2 Lib; 9 Lib
천체 데이터
- 카탈로그 지정명
- HIP 72622; Alpha2 Lib; 9 Lib
- 유형
- DoubleStar
- 별자리
- Lib
- 등급
- 2.75
- 적경
- 14h 50m 52.7s
- 적위
- -16° 02' 30.0"
- 거리
- 76 광년
- HR
- 5531
- HIP
- 72622
- Bayer
- Alpha2
서베이 이미지
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Zuben Elgenubi 소개
설명
Zuben Elgenubi is a wide double star system at magnitude 2.75 in Libra, the second brightest star in the constellation. A white subgiant of spectral type A3IV, located about 77 light-years from Earth. A telescope reveals a fainter companion (magnitude 5.2) about 231 arcseconds away, making it one of the widest bright double stars in the sky.
관측 팁
Zuben Elgenubi is the more southerly of Libra's two main stars, forming the southern pan of the Scales with Zuben Elschemali to the north. The wide companion is visible in binoculars. The pair lies between Virgo and Scorpius on the ecliptic. Best observed May through July.
역사
The name Zuben Elgenubi comes from the Arabic 'al-zuban al-janubi,' meaning 'the southern claw,' from when Libra's stars were considered part of Scorpius. The Romans separated them into Libra, the only zodiacal constellation representing an inanimate object.
재미있는 사실
The ecliptic passes very close to Zuben Elgenubi, making it one of the most frequently occulted bright stars. The Moon and planets regularly pass over it, and it has been used to study the lunar limb profile during occultations.