Order by: Trending (past 30 days)Date
Community photo entitled Ghosts of Cassiopeia, 10.500 ly by Andy Dungan on 10/16/2026 at Near Cotopaxi, Colorado USA

Ghosts of Cassiopeia, 10.500 ly

On 10/16/2026 01:00 am by Andy Dungan | Website | Near Cotopaxi, Colorado USA

My original intention was to have this project complete before Halloween. But alas the challenges to develop kept me from meeting that goal. I was also limited by lack of clear skies and got fewer images than I would have preferred. Maybe next year I will do better.

Pics were taken between Oct 12 & 16.

Askar 120apo@840f7.5, 2600MM Pro g100. [7.1hrs total] R:25x300s G:30x300s B:30x300s
[3.9hrs total] Ha:47x300s+darks/biases/flats.
AM5/ASIair+, EAF, Askar OAG with ASI174mini for guiding

PixInsight 100%.

This was a challenging project to develop because of the brightness of the star. It took a lot of different masks to clean up the background and after much experimentation I was quite satisfied with the final result. I was surprised that I really did not need an Ha image for this project. I slightly increased the red color from the Ha image, but honestly it was not necessary. So a straight RGB image would have been adequate for this project.