Caldwell 21
C21
📋 A written introduction is coming — for now this page shows official values only.
Object
- Type (NASA)
- Dwarf Irregular Galaxy
- Distance from Earth
- 10,000,000 light-years
- Apparent magnitude
- 9.6 mag
- NASA description
- Discovered in 1788 by astronomer William Herschel, Caldwell 21 is dwarf irregular galaxy bursting with forming stars.
Source:NASA Hubble (Messier/Caldwell catalogs) · checked 2026-11-02 ↗
Related
Constellation
In everyday life
- Light from this object takes about 10,000,000 years to reach Earth — the light you see tonight left 10,000,000 years ago (official distance ÷ speed of light).
- At magnitude 9.6 it is fainter than the naked-eye limit (about 6) — you need binoculars or a telescope.
- It lies in Canes Venatici — find the constellation first to know where to look.