M55 · Messier 55
| Chinese name | M55 球状星团 |
|---|---|
| Type | Globular cluster |
| Constellation | Sgr |
| RA | 19h40m |
| Dec | −31° |
| Apparent magnitude | 6.3ᵐ |
| Hemisphere | Southern |
| Best season | Summer |
| Difficulty | Moderate |
| Focal length | 长焦 800–1500mm |
About
About 17,000 light-years away, M55 is a large, loose globular cluster in Sagittarius with a relatively diffuse core, so even small telescopes resolve many of its members. Near the southern Milky Way it appears as an evenly spread field of golden stars with a large apparent size. A long-focal wide field captures its sprawling star sea, a rewarding summer southern globular target.