Alnair
HIP 109268; Alpha Gru
물리적 특성
위치 & 식별자
가시성
사용자 설정에서 관측지를 설정하세요 가시성 데이터를 확인할 수 있습니다.
다중 항성계
접안렌즈 시야
Sep: 17.0″ · PA: 155° · 위=북, 왼쪽=동
분해됨 · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
크기 비교
항성의 진화
분광 분류
헤르츠스프룽-러셀 도표
흑체 복사 스펙트럼
항성 흡수 스펙트럼
스펙트럼 유형을 기반으로 한 시뮬레이션 흡수 스펙트럼. 선 위에 마우스를 올려 원소를 식별하세요.
항성 참고사항
서베이 이미지
서베이 이미지 로드 중…
Alnair 소개
설명
Alnair is the brightest star in the constellation Grus (the Crane) at magnitude 1.74, located about 101 light-years from Earth. It is a blue-white subgiant of spectral type B7IV, about 4 times the mass of the Sun and roughly 380 times more luminous. Alnair rotates rapidly, with a projected rotational velocity of about 215 km/s.
관측 팁
Alnair is a Southern Hemisphere star, visible from latitudes south of about 37°N. It marks the eye or beak of the Crane and helps identify the constellation Grus, which lies south of Fomalhaut. Together with the other bright stars of Grus, it forms a graceful pattern in the autumn/winter sky of the Southern Hemisphere. Best observed from September through November from southern latitudes.
역사
The name Alnair comes from the Arabic 'al-Nayyir' meaning 'the bright one,' originally referring to the brighter star in the tail of the Southern Fish. The constellation Grus was introduced by Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman in the late 16th century from observations made during voyages to the East Indies.
재미있는 사실
Alnair is a rapid rotator, spinning at over 200 km/s at its equator — about 100 times faster than the Sun. This rapid rotation likely gives it a noticeably oblate shape, though this has not yet been directly measured. It marks the transition point in our list between the 'first magnitude' stars (brighter than 1.5) and the slightly fainter members of the brightest star club.