Designation:
M21
Date:
August 5th, 2018
Camera:
Canon EOS 7D Mark II ( unmodified )
Optics:
Sky-Watcher ED120mm Doublet
Focal Length:
900 mm
Exposure:
30 x 200 sec.
ISO:
800
Mount:
Sky-Watcher NEQ6 Pro
Guiding:
Orion Star Shoot Auto Guider
Software:
Adobe Photoshop, DSS, Astroflat
Notes:
Messier 21 (M21) is an open cluster located in the southern constellation Sagittarius. It has an apparent magnitude of 6.5. M21 consists mainly of small, faint stars, but is also home to a few blue giants. The cluster contains about 57 confirmed members, but is pretty densely packed.