Caldwell 4
C4
📋 A written introduction is coming — for now this page shows official values only.
Object
- Type (NASA)
- Reflection Nebula
- Distance from Earth
- 1,400 light-years
- Apparent magnitude
- 7 mag
- NASA description
- Also called the Iris Nebula, or NGC 7023, Caldwell 4 is of particular interest to astronomers.
Source:NASA Hubble (Messier/Caldwell catalogs) · checked 2026-11-02 ↗
Related
Constellation
In everyday life
- Light from this object takes about 1,400 years to reach Earth — the light you see tonight left around AD 626 (official distance ÷ speed of light).
- At magnitude 7 it is fainter than the naked-eye limit (about 6) — you need binoculars or a telescope.
- It lies in Cepheus — find the constellation first to know where to look.