C30
NGC 7331
천체 데이터
- 카탈로그 지정명
- C30
- 유형
- Galaxy
- 별자리
- Pegasus
- 등급
- 9.5
- 적경
- 22h 37m 04.1s
- 적위
- +34° 25' 01.2"
- 거리
- 49,000,000 광년
- 각크기
- 11
서베이 이미지
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C30 소개
설명
NGC 7331 is a bright spiral galaxy in Pegasus, about 40 million light-years away. Often called the Milky Way's twin, it is a large, inclined spiral with a prominent bulge and well-defined dust lanes. It appears to lead a small group of background galaxies known as the Deer Lick Group.
관측 팁
One of the brighter non-Messier galaxies, visible in a 4-inch telescope as an elongated glow with a bright core. An 8-inch scope shows the disk and hints of dust lanes. The four smaller background galaxies require 10 inches or more. Best in autumn.
역사
Discovered by William Herschel on September 5, 1784. The group of background galaxies (NGC 7335, 7336, 7337, 7340) was once thought to be physically associated but lies 10 times more distant.
재미있는 사실
NGC 7331 rotates in the opposite direction from what its spiral arm winding would suggest, a phenomenon called "backwards spinning" that remains unexplained.
커뮤니티 사진 (1)
Credit: Ngc1535. License: CC BY 3.0. (Wikimedia Commons)
Skybred Mar 2, 2026