Blue Snowball
NGC 7662
천체 데이터
- 카탈로그 지정명
- C22
- 유형
- PlanetaryNebula
- 별자리
- Andromeda
- 등급
- 8.3
- 적경
- 23h 25m 09.6s
- 적위
- +42° 32' 20.4"
- 거리
- 5,600 광년
- 각크기
- 0.5
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)
Skybred Mar 2, 2026