Messier 103
M103 · NGC 581
📋 A written introduction is coming — for now this page shows official values only.
Object
- Type (NASA)
- OC
- Apparent magnitude
- 7.4 mag
- Apparent size
- 6 ′
Source:NASA HEASARC (Goddard Space Flight Center) · checked 2026-11-02 ↗
Related
Constellation
In everyday life
- At magnitude 7.4 it is fainter than the naked-eye limit (about 6) — you need binoculars or a telescope.
- It spans about 6′ of sky — about 1/5 of the full Moon's 31′.
- It lies in Cassiopeia — find the constellation first to know where to look.
Worked out from this object's official values.