C86
NGC 6397
천체 데이터
- 카탈로그 지정명
- C86
- 유형
- GlobularCluster
- 별자리
- Ara
- 등급
- 5.7
- 적경
- 17h 40m 42.0s
- 적위
- -53° 40' 26.4"
- 거리
- 7,500 광년
- 각크기
- 26
서베이 이미지
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C86 소개
설명
NGC 6397 is one of the nearest globular clusters to Earth, at about 7,800 light-years away in Ara. At magnitude 5.7, it is visible to the naked eye from dark sites. It has an unusual core-collapsed structure, meaning its center has become extremely dense.
관측 팁
A superb target visible to the naked eye as a fuzzy star. Binoculars show a granular ball. Any telescope resolves it into a beautiful field of stars. Notable for its lack of a bright concentrated core — a hallmark of core collapse. Best in summer from southern locations.
역사
Discovered by Nicolas Louis de Lacaille in 1751 from South Africa. It is one of the two nearest globular clusters (along with M4) and has been extensively studied by the Hubble Space Telescope.
재미있는 사실
NGC 6397 has undergone core collapse, a gravitational process where the most massive stars sink to the center, creating an extremely dense core. Hubble images revealed a population of faint blue stars in its core — helium-core white dwarfs in binary systems.
커뮤니티 사진 (1)
Credit: NASA/ESA and the Hubble Heritage Team (AURA/STScI). License: Public domain. (Wikimedia Commons)
Skybred Mar 2, 2026