Adara
HIP 33579; Epsilon CMa; 21 CMa
물리적 특성
위치 & 식별자
가시성
사용자 설정에서 관측지를 설정하세요 가시성 데이터를 확인할 수 있습니다.
다중 항성계
접안렌즈 시야
Sep: 7.9″ · PA: 162° · 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…
Adara 소개
설명
Adara (Epsilon Canis Majoris) is the second brightest star in Canis Major at magnitude 1.50, located about 430 light-years from Earth. It is a blue giant of spectral type B2Iab, about 11 times the mass of the Sun and roughly 38,000 times more luminous. Adara is one of the strongest sources of extreme ultraviolet radiation in the sky as seen from Earth.
관측 팁
Adara sits at the hindquarters of Canis Major, forming part of the distinctive triangle of stars south of Sirius. Its blue-white color is evident through binoculars. Adara has a faint companion (magnitude 7.5) at about 7.5 arcseconds separation, resolvable in a small telescope. The star is visible from both hemispheres. Best observed from January through March.
역사
The name Adara comes from the Arabic 'al-Adhara' meaning 'the maidens' or 'the virgins.' About 4.7 million years ago, Adara was the brightest star in Earth's sky, shining at magnitude -3.99 when it was only about 34 light-years away. Since then, its proper motion has carried it much farther from the Sun.
재미있는 사실
Adara was once the brightest star in Earth's sky — it holds the record for the brightest apparent magnitude ever achieved by any star other than the Sun as seen from Earth's position, reaching nearly magnitude -4 about 4.7 million years ago. It is the strongest source of photons in the extreme ultraviolet range (504-912 Å) in the sky.