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Two Cosmic Bubbles

The Crescent Nebula and Soap Bubble

June 8th, 2018

The Crescent nebula (upper right) is a bubble of ionized gas formed by a Wolf-Rayet (or WR) star. WR stars are huge short lived stars that lose mass as they age, many ending in spectacular supernovae. The gas surrounding the Crescent is part of a huge hydrogen rich area of the milky way around the constellation of Cygnus. If you look closely, the soap bubble lies in the bottom left corner of the image as a small faint circle. This planetary nebula is famously hard to capture and I really need more data in order to bring it out better.

I decided to revisit the crescent and did so with a different optical train and a years worth of experience with my camera (the first time I imaged the crescent it was my first light on my ASI 1600). I think I did a much better job of capturing the OIII shell this time.

Captured on: May 29th and 30th, 2018

Gear:
AT6RC, 896mm @ F/5.9

AP CCDT67
ZWO ASI 1600mm-C
ZWO EFW-8
ZWO filters
Skywatcher NEQ6 Pro
Orion SSAG

Acquisition:

Hydrogen Alpha: ZWO 7nm Ha filter(1.25″), 120x120s, -10C, Gain 200, Offset 50
Oxygen III: ZWO 7nm OIII filter(1.25″), 120x120s, -10C, Gain 200, Offset 50

Total Acquisition of 8hrs

Software:
PS, DSS, PHD2, SGP, EQMOD

Thanks for looking!