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Blue Snowball

NGC 7662

행성상 성운 우수 (70/100)
C22 PlanetaryNebula Andromeda 관측 가능 난이도 3 Medium telescope (6-8") - Benefits from OIII filter
Credit: Judy Schmidt. License: CC BY 2.0. (Wikimedia Commons)
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특성

등급 8.3
각크기 0.3′
거리 5600 ly
Planetary Nebula [Distance: 5600 ly]

위치 & 식별자

RA 23h 25m 09.6s
Dec +42° 32' 20.4"
별자리 Andromeda
카탈로그 C22

가시성

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서베이 이미지

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Blue Snowball 소개

설명

The Blue Snowball (NGC 7662) is a planetary nebula in Andromeda, about 5,600 light-years away. It has a distinctive blue-green color and a complex multi-shell structure visible in photographs, with a bright inner ring spanning about 12 arcseconds.

관측 팁

Easy to find and satisfying in small telescopes. A 4-inch scope shows a bright blue-green disk at 100x. Higher power (200x+) may reveal the annular structure. An OIII filter enhances the view. Best in autumn evenings.

역사

Discovered by William Herschel on October 6, 1784. It earned its name from its vivid blue color, unusual among planetary nebulae which more commonly appear green from OIII emission.

재미있는 사실

The Blue Snowball has multiple concentric shells from successive mass-loss episodes. Its central star has a temperature of about 75,000 K and a luminosity 2,000 times that of the Sun.

커뮤니티 사진 (1)

Credit: Judy Schmidt. License: CC BY 2.0. (Wikimedia Commons)

Credit: Judy Schmidt. License: CC BY 2.0. (Wikimedia Commons)

Skybred Mar 2, 2026