Alpha CVn (HIP 63125)
COR CAROLI
천체 데이터
- 카탈로그 지정명
- HIP 63125; Alpha2 CVn; 12 CVn
- 유형
- DoubleStar
- 별자리
- CVn
- 등급
- 2.90
- 적경
- 12h 56m 01.7s
- 적위
- +38° 19' 06.0"
- 거리
- 115 광년
- HR
- 4915
- HIP
- 63125
- Bayer
- Alpha2
서베이 이미지
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Alpha CVn (HIP 63125) 소개
설명
Cor Caroli is a chemically peculiar star of spectral type A0pSiEuHg at magnitude 2.90, the brightest star in Canes Venatici (the Hunting Dogs). Located about 110 light-years from Earth, it is the prototype of the Alpha2 Canum Venaticorum class of magnetic variable stars, with starspots of concentrated silicon, europium, and mercury. It is a wide double with a fainter companion visible in small telescopes.
관측 팁
Cor Caroli lies below the handle of the Big Dipper, about 7 degrees south of Alkaid. A small telescope reveals the companion (magnitude 5.5) about 19 arcseconds away. It is the starting point for finding the Whirlpool Galaxy (M51) and other Canes Venatici deep-sky objects. Best observed March through July.
역사
The name Cor Caroli means 'the Heart of Charles,' named by Edmund Halley in honor of King Charles I of England (some sources say Charles II). It is one of the few bright stars named after a modern historical figure rather than derived from Arabic or classical sources.
재미있는 사실
Cor Caroli defines an entire class of chemically peculiar variable stars. Its strong magnetic field concentrates rare elements into spots on its surface, causing small brightness variations as it rotates — a stellar version of sunspots, but driven by magnetic chemistry.