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C86

NGC 6397

구상성단 최고의 관측 대상 (89/100)
C86 GlobularCluster Ara 관측 가능 난이도 2 Small telescope (4") - Higher magnification helpful
Credit: NASA/ESA and the Hubble Heritage Team (AURA/STScI). License: Public domain. (Wikimedia Commons)
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특성

등급 5.7
각크기 15.3′
거리 7500 ly
Globular Cluster [Distance: 7500 ly]

위치 & 식별자

RA 17h 40m 42.0s
Dec -53° 40' 26.4"
별자리 Ara
카탈로그 C86

가시성

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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)

Credit: NASA/ESA and the Hubble Heritage Team (AURA/STScI). License: Public domain. (Wikimedia Commons)

Skybred Mar 2, 2026