Caldwell 100
C100
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Object
- Type (NASA)
- Open Cluster in a Nebula
- Distance from Earth
- 6,000 light-years
- Apparent magnitude
- 2.9 mag
- NASA description
- With dark clouds, an emission nebula, and embedded star clusters, Caldwell 100 offers a wealth of things to see.
Source:NASA Hubble (Messier/Caldwell catalogs) · checked 2026-11-02 ↗
Related
Constellation
In everyday life
- Light from this object takes about 6,000 years to reach Earth — the light you see tonight left 6,000 years ago (official distance ÷ speed of light).
- At magnitude 2.9 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- It lies in Crux — find the constellation first to know where to look.