Hercules Cluster
M13
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Object
- Type (NASA)
- Globular Cluster
- Distance from Earth
- 25,000 light-years
- Apparent magnitude
- 5.8 mag
- Apparent size
- 17 ′
- NASA description
- Astronomer Edmond Halley, of Halley's comet fame, discovered Messier 13 in 1714.
Source:NASA Hubble (Messier/Caldwell catalogs) · checked 2026-11-02 ↗NASA HEASARC (Goddard Space Flight Center) · checked 2026-11-02 ↗
Related
Constellation
In everyday life
- Light from this object takes about 25,000 years to reach Earth — the light you see tonight left 25,000 years ago (official distance ÷ speed of light).
- At magnitude 5.8 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- It spans about 17′ of sky — about half the full Moon's 31′.