Bubble Nebula
Emission nebula

Bubble Nebula

NGC 7635 · Cassiopeia
These photons are ~11,000 years old
LP
Date
2025-09-24
Location
36.3858° N, 28.0412° E
Integration
46m (274 × 10s)
Software
ZWO Seestar app
Notes
—
Plate solve
Centre RA
23h 26m 49.4s
Centre Dec
+61° 28′ 52″
Field
55.7′ × 98.9′
Pixel scale
2.38″/px
Orientation
58.7° E of N
TelescopeZWO Seestar S50
CameraZWO Seestar S50 Camera
RigFamily Holiday Rig
Captured from · Ελλάς
36.3858° N, 28.0412° E · open map ↗

Where to find it

Interactive sky chart centred on 23 26 49.4 +61 28 52, with constellation stick figures overlaid. Locate shows the whole constellation with the target ringed; Field zooms to the close-up. Drag to pan, scroll to zoom, click any star to identify it. Imagery: DSS colour survey via CDS Aladin Lite. Constellation figures © Dominic Ford (GPLv3).

A spherical emission nebula blown out by the stellar wind of the massive O-star BD+60°2522 at its edge — not its centre. The bubble is lit unevenly because the star sits off-centre in a denser cloud. Invariably imaged alongside M52 in the same field.

Frequently asked questions

What kind of object is NGC 7635?
NGC 7635 is an emission nebula.
Which constellation is NGC 7635 in?
NGC 7635 lies in the constellation Cassiopeia.
How far away is NGC 7635?
The light in this image left NGC 7635 roughly ~11,000 years ago, so that is how far back in time you are seeing it.
What are the coordinates of NGC 7635?
NGC 7635 sits at right ascension 23h 26m 49s and declination +61° 28′ 52″ (J2000).
When is the best time to photograph NGC 7635?
NGC 7635 is circumpolar from around 54°N — it never sets, and rides highest (about 82° altitude) on evenings around September.
What equipment was used to photograph NGC 7635?
This image of NGC 7635 was captured with ZWO Seestar S50 and ZWO Seestar S50 Camera.
How much exposure time went into this image?
This image of NGC 7635 represents 46m (274 × 10s) of total integration time.