NGC 6809, Messier 55 in Sagittarius

NGC 6809, M55, is one of the easiest globular clusters to resolve.

Date:  3 July 2022

FOV:  approximately 68' × 45'; the angular size of M55 is about 19'

Telescope:  Stellarvue SVX102T + SFFX-1 (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:  Twenty-one 240 second frames using Deep Sky Stacker

Total Time:  1 hour and 24 minutes

Processing:  Pixinsight – Part I:  DBE, SPCC, MaskedStretch, HistoTrans,

SCurve, Saturation, Crop/Scale

Location:  Cherry Springs State Park near Coudersport, PA