NGC 7538 – Emission Nebula in Cepheus
NGC 7635 – The Bubble Nebula in Cassiopeia
Telescope: Meade SN8 at f/4, Orion Atlas EQ-G
Camera: ZWO ASI071MC Pro, 10C; Gain: 200
Filter: 2” OPT Triad Ultra Hb, OIII, Ha, SII filter
Guide scope: Williams Optics 50mm, Meade DSI Pro II, PHD
Exposure: 28x240sec saved as FITS
Darks: 32x240sec saved as FITS
Flats: 32x60sec using an LED tracing tablet with 3 layers of muslin
Average Light Pollution: Red zone, fair transparency
Lensed Sky Quality Meter: 18.5 mag/arc-sec^2
Stacking: Mean with a 2-sigma clip.
White Balance: Nebulosity Automatic Color Balance
Software: Nebulosity, Deep Sky Stacker, Photoshop
While imaging NGC 7635 you often see the open cluster M52 to the northeast, but on one occasion I also noticed a beautiful red emission nebula off to the northwest; NGC 7538. I revisited this area to image both NGC 7635 (lower left) and 7538 (upper right) in the same field. There’s also a faint patch of H-alpha emission to the lower right.