Caldwell 18
C18
📋 A written introduction is coming — for now this page shows official values only.
Object
- Type (NASA)
- Seyfert Galaxy
- Distance from Earth
- 2,000,000 light-years
- Apparent magnitude
- 9.2 mag
- NASA description
- Caldwell 18 is a nearby galaxy in the local group with an active galactic nucleus.
Source:NASA Hubble (Messier/Caldwell catalogs) · checked 2026-11-02 ↗
Related
Constellation
In everyday life
- Light from this object takes about 2,000,000 years to reach Earth — the light you see tonight left 2,000,000 years ago (official distance ÷ speed of light).
- At magnitude 9.2 it is fainter than the naked-eye limit (about 6) — you need binoculars or a telescope.
- It lies in Cassiopeia — find the constellation first to know where to look.