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C17

NGC 147

은하 양호 (55/100)

Elliptical

C17 Galaxy Cassiopeia 관측 가능 난이도 4 Large telescope (10"+) - Dark skies recommended
Credit: NASA Hubble Space Telescope. License: CC BY 2.0. (Wikimedia Commons)
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특성

등급 9.5
각크기 9.4′ × 5.4′
위치각 26°
거리 2500000 ly
은하 유형 Elliptical (E)
Elliptical Galaxy [Distance: 2500000 ly]

위치 & 식별자

RA 00h 33m 12.0s
Dec +48° 30' 00.0"
별자리 Cassiopeia
카탈로그 C17

가시성

사용자 설정에서 관측지를 설정하세요 가시성 데이터를 확인할 수 있습니다.

서베이 이미지

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C17 소개

설명

NGC 147 is a dwarf spheroidal galaxy in Cassiopeia, about 2.5 million light-years away. It is a satellite of the Andromeda Galaxy (M31) and forms a pair with its neighbor NGC 185 (C18). The galaxy has virtually no gas, dust, or recent star formation.

관측 팁

A faint, diffuse smudge requiring at least a 6-inch telescope and dark skies. It has very low surface brightness. Use low power and averted vision. Located about 1 degree from NGC 185 and both can be seen in the same wide field. Best in autumn.

역사

Discovered by John Herschel in 1829. It was one of the first dwarf galaxies recognized as a satellite of M31, helping astronomers understand the hierarchical structure of galaxy groups.

재미있는 사실

NGC 147 stopped forming stars about 3 billion years ago, making it a "dead" galaxy. Despite being a satellite of Andromeda, it lies about 660,000 light-years from M31's center.

커뮤니티 사진 (1)

Credit: NASA Hubble Space Telescope. License: CC BY 2.0. (Wikimedia Commons)

Credit: NASA Hubble Space Telescope. License: CC BY 2.0. (Wikimedia Commons)

Skybred Mar 2, 2026