M19
NGC 6273
천체 데이터
- 카탈로그 지정명
- M19
- 유형
- GlobularCluster
- 별자리
- Ophiuchus
- 등급
- 6.8
- 적경
- 17h 02m 37.7s
- 적위
- -26° 16' 04.6"
- 거리
- 28,700 광년
- 각크기
- 13.5
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M19 소개
설명
M19 is one of the most oblate (flattened) globular clusters known, located about 28,700 light-years from Earth in Ophiuchus. It lies very close to the galactic center — only about 6,500 light-years from it — and the Milky Way's tidal forces are likely responsible for its elongated shape. The cluster contains several hundred thousand stars.
관측 팁
Located about 8 degrees due east of Antares. Appears as a small, oval fuzzy patch in binoculars. A 4-inch telescope shows a bright, slightly elongated glow. Resolving stars requires 8 inches or more. Look carefully for the elongated shape — M19 is visibly non-circular even in moderate apertures. Best observed from June through August.
역사
Discovered by Charles Messier on June 5, 1764. He described it as a 'nebula without stars.' William Herschel resolved it into stars and noted its elliptical shape. Modern studies confirm it is one of the most flattened globular clusters in the Milky Way.
재미있는 사실
M19's oblateness (ellipticity of about 0.3) is remarkable among globular clusters, which are typically quite round. Its proximity to the galactic center subjects it to intense tidal forces that distort its shape. The cluster is heavily reddened by interstellar dust, losing about 1.5 magnitudes of brightness.
커뮤니티 사진 (1)
Credit: Doug Williams, REU Program / NOIRLAB / NSF / AURA. License: CC BY-SA 4.0. (Wikimedia Commons)
Skybred Feb 28, 2026