Sunday, 18 June 2017

AR12662 in CaK - 17th June

A couple of shots of this solitary spot and its associated active region taken with the 100mm Tal100R telescope stopped down to 80mm with the Beloptik tri-band, and, using the home brew CaK filter and the PGR Chameleon 3 camera.  On one of the hottest days of the year so far seeing was deteriorating quickly and so was not able to try larger apertures in these short wavelengths.