Bubble Nebula is a very faint (not visual) object in the constellation of Cassiopeia. The bubble is thought to have been formed by ionized gas emissions from a massive O type young star BD+60◦2522. According to this March 2020 paper (Link), the shell is formed by this fast-rotating O type star. This rotation and stellar winds create this bubble from the surrounding medium of perhaps its progenitor interstellar cloud.

This photo is taken over multiple days from Santa Clara backyard during the summer of 2020. (not with very favorable conditions).

Catalogue Name	NGC 7635
Constellation	Cassiopeia
Distance (Light Years)	~8000 Light Years (https://iopscience.iop.org/article/10.1086/344596/fulltext/) (Further Gaia data validation of the star at 2.5Kpc)
Photographic Information
Exposure	Total integration time; 28-30 hours in narroband (Hydrogen Alpha, Oxygen 3 and Sulfur 2)
Equipment	F3.8 AGO 10” Imaging Newt, QSI 683wsg, Paramount MyT, SSAG Auto-guider
Processing	Pixinsight, Adobe PS
Imaging Location	Santa Clara, CA (August-September 2020)