Sh2-157 (Lobster Claw) & SH2-252 (Bubble) and Area Nebulae in Cassiopeia, August 2023
Teleview 127is; AP Mach2 GTO
ASI6200MM, - Baader RGB & 6.5nm NB CMOS opt. filters
H,O,S: (53,24,44 x 420s, Bin 1, Gain 200)
R,G,B: (23,27,37 x 90s Bin 1, Gain 200) (for stars)
Total integration time = 16.3 hrs
All the nebulosity in this image is part of a large molecular cloud within Cassiopeia, dominated by hydrogen emissions, but also contain heavier elements and ions. In general, all of the emissions seen are energy converted by the molecular cloud components from UV radiation from nearby stars and star clusters. Blue is from doubly ionized oxygen, that emits under intense UV. Greens to orange are from hydrogen atoms under weaker UV, while reds are provided by sulphur, which ionized much more readily than oxygen. The molecular cloud itself is both generating new stars, and at the same time being blown into the patterns (and the bubble) seen here by the winds from the very stars created by it.
This represents yet another look I took at this area with my Teleview 127is telescope. Providing much practice in managing colour and details. A good chunk of frames taken over 5 nights were rejected due to moisture in the air. Despite this, there were plenty of frames to even capture additional detail through drizzle integration.