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The Bubble Nebula and its Neighbors

NGC 7635 and M 52

NGC 7635 (the Bubble Nebula, top right) is an interesting emission nebula in Cassiopeia. The “bubble” in the center is actually gas being pushed by the stellar wind of a hot young star at the center of the nebula, SAO 20575. Here I have used a hydrogen alpha filter to augment the natural appearance of the nebula while still retaining color similar to what the human eye would see. M 52, the open cluster in the bottom left of the image, is only a neighbor to the bubble because of chance. In actuality, the bubble nebula is much farther away from earth, but the two line up to make a great field of view. I took this image from my house in a Bortle red/white zone.

Captured on: June 12th, 15th, and 21st, 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″), 70x180s, -10C, 1×1 bin, Gain 200, Offset 50
Red: ZWO Red filter(1.25″), 30x120s, -10C, 1×1 bin, Unity Gain
Green: ZWO Green filter(1.25″), 30x120s, -10C, 1×1 bin, Unity Gain
Blue: ZWO Blue filter(1.25″), 30x120s, -10C, 1×1 bin, Unity Gain

Total Acquisition of 6hrs, 30 minutes

Software:
PS, DSS, PHD2, SGP, EQMOD

Thanks for looking!