Sunspot groups 2415 and 2418 – September 20, 2015
Another superb Summer-like day. And another solar imaging session, this time together with my wife.
The telescope chosen for this session was the 8inch F/5 homemade Newtonian (SkyWatcher optics) with Astrosolar full-aperture filter, ASI120MM-S camera and Red filter. The seeing was good for a brief minutes, time in which I could get images for only one of the visible sunspot groups. This was again (like in the previous post) AR 2418, a solitary crosser of the Sun.
A few minutes later, the seeing degraded quite a bit, and it remained like that for an hour until we’ve decided to leave.
Still, one series was acquired of the very active group AR2415, closing in to the solar limb.