NGC 6822 in Sagittarius, Barnard's Galaxy and IFN

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:  23 July 2025

FOV:  cropped to 75' × 50'

Telescope:  Celestron C14 SCT (3910mm, f/11)

Starizona HyperStar (731.83mm, f/1.9)

Guiding:  ZWO2600 MC Duo internal ASI220MM mini

Computer:  ASIair plus 256GB

Mount:  iOptron CEM120

Camera:  ZWO ASI2600 MC Duo Cooled (0°C) Color CMOS gain 0

Pixel size:  3.76 μm

Resolution:  1.060 arcsec/pixel

Filter:  Optolong UV/IR cut

Frames:  sixty-five 300 second subs

Total Time:  5 hours and 25 minutes

Calibration:  20 flats, 20 dark flats, and 20 darks

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

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

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

Starless, HDRMST6PhLm,

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

Location:  Darling Hill Observatory near Vesper, NY