CTB1 or the Garlic Nebula
I was scrolling through Stellarium and noticed a very faint semi-circular object in the constellation Cassiopeia, not too far from the famous Bubble Nebula.
This object catalogue as CTB 1 or Abell 85, was originally listed in the famous Abell catalog of planetary nebula. Later discoveries by revealed that CTB 1 is actually a very faint supernova remnant, about the size of the full moon. It is not the most photographed object and I couldn't find many images on it.
The hydrogen-alpha shell is extremely faint, and was just barely visible in a 10-minute sub-exposure. Being in Bortle 7 didn't help either. Revealing the full circular shape was definitely going to be a challenge, so I spent three whole nights on this object for a total exposure time of 20 hours. I had to throw out 25% of it due to high clouds! It was worth it though. My image shows many fine filaments in the ionized gas and shell of this exploded star is ruptured on the bottom right side.
Equipment :
Mount - SkyWatcher EQ6R Pro
Telescope - Orion 115mm EDT
Camera - ZWO ASI294MC Pro
Guiding Scope - SVBony SV106
Guiding Camera - ZWO ASI120mm Mini
Acquisition - ZWO ASI Air Plus
Narrowband Filter - Optolong Lextreme
EXIF:
Exposure - 10 min subs
Integration - 16hr 10 mins
Gain - 120
Bortle Scale - 7
Software - Pixinsight, Photoshop
Copyrights: