C9 in Cepheus, the Cave Nebula

C9, the Cave Nebula in Cepheus is 2400 ly from us.

Hover over the picture for an annotated version

Date:  25 and 31 July 2022

FOV:  approximately 105' × 70'

Telescope:  Stellarvue SVX102T + SFFX-1 flattener (714mm, f/7)

Guiding:  ZWO ASI120MM mini mono guide camera,

Stellarvue F050G 50mm guide scope

Computer:  ASIair pro Raspberry Pi

Mount:  iOptron CEM40

Camera:  ZWO ASI071MC Pro Cooled (-10°C) Color CMOS with gain 240

Filter:  Baader Light Pollution Moonglow filter with IR cut (15 frames, 90 gain)

and Optolong L-eNhance narrow dual band (79 frames, 240 gain)

Stacking:  Seventy-nine 240 second frames, (25 and 31 July) and

Fifteen 240 second frames, (31 July) using Deep Sky Stacker

Total Time:  6 hours 16 minutes

Processing:  Pixinsight – SPPC, DBE, SPCC, BlurXT, NoiseXT, DynCrop → Linear

MStr, GHS, HST, PMath MStr + GHS + HST → Stars, Sat,

StarXT, MStr, GHS, HST, PMath MStr + GHS + HST → Starless,

HDR644TiLm, Sat, PMath ~(~Stars*~Starless) → Blend, scale

Location:  Cherry Springs State Park near Coudersport, PA (25 July)

and Darling Hill Observatory near Vesper, NY (31 July)