NGC 6656, M22, is a globular cluster in Sagittarius
with a rich, starry background. With so many
Milky Way stars as a backdrop, it is very
difficult to see the true size of M22.
M22 contains 500 000 stars and
is only 10.6 kly from us.
Hover over the picture for an annotated version
Date: 29 May 2022 and 24 June 2022
FOV: approximately 60' × 40'; the angular size of M22 is about 32'
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
Pixel size: 4.78 μm
Resolution: 1.340 arcsec/pixel
Filter: Baader Light Pollution Moonglow filter with IR cut
Stacking: Twenty-four 240 second frames using Deep Sky Stacker
Total Time: 1 hour 36 minutes
Processing: Pixinsight – SPCC, BlurXT, NoiseXT, GHS, MStr, HST,
PMath GHS + MStr + HST, Sat, DynCrop/Scale
Location: Darling Hill Observatory in Vesper, NY
