The Bubble Nebula (catalogued as NGC 7635) is an HII region emission nebula in the constellation Cassiopeia. The “bubble” was created by the stellar wind from the massive, hot central star ASO20575. The nebula is near a giant molecular cloud which contains the expansion of the bubble, while itself being excited by the star. The Bubble Nebula is located 7100 lightyears from earth, measuring 3.7 lightyears in radius, giving it an apparent size of 15 arc-min x 8 arc-min from our perspective on earth.
This image was taken on the night of October 2nd, 2022 using a ZWO ASI533MC Pro through an 8” Celestron EdgeHD at F7 atop a Celestron CGEM-DX. It is composed of 100 x 180s sub exposures, for a total integration time of 5h.
This image was taken from my backyard observatory, just outside of the the village of White Lake, Ontario.