NGC 6822 in Sagittarius, Barnard's Galaxy

NGC 6822 is a barred irregular galaxy in the constellation

Sagittarius.  Just above and left of center is the

Little Gem Nebula, NGC 6818.

Hover over the picture for an annotated version

Date:  21 and 22 July 2022

FOV:  approximately to 110' × 73'; the angular size of NGC 6822 is about 15.5' × 13.5'

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

Stacking:  Forty-eight 240 second frames using Deep Sky Stacker

Total Time:  3 hours 12 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,

HDR486PhLm, Sat, PMath ~(~Stars*~Starless) → Blend, scale

Location:  Darling Hill Observatory in Vesper, NY