The Bubble Nebula and its Neighbors
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
AT6RC, 896mm @ F/5.9
ZWO ASI 1600mm-C
Skywatcher NEQ6 Pro
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
PS, DSS, PHD2, SGP, EQMOD
Thanks for looking!