M39 — Open Cluster in Cygnus
A large open cluster in Cygnus, its young blue stars scattered across an area as wide as the full Moon, visible with binoculars.
View photos ↓- Object type
- Open cluster
- Constellation
- Cygnus
- Designation
- M39 (NGC 7092)
- Distance
- ≈ 1,000 light-years
- Apparent magnitude
- 4.6
- Apparent size
- 31 arcmin
- Best season
- Summer / Autumn (best visibility in Aug-Sep)
The open cluster M39 (NGC 7092) is a loose group of young stars near the tail of Cygnus, not far from Deneb. Its low density and large apparent size — almost that of the full Moon — make it better suited to binoculars or small wide-field instruments than to classic telescopes.
In this image, the cluster’s bluish stars stand out clearly, scattered across a wide field, against a dense stellar background typical of this region of the Milky Way.
Session shot on the night of 2026-07-25 with the Seestar S30 Pro mounted in equatorial mode on the EQ3: 196 sub-exposures of 30 seconds each, for about 1h38 of total integration, stacked and processed in Siril.
