Bubble Nebula

Designation: NGC 7635 / Sh2-165 / C 1
Hemisphere: Northern
Constellation: Cassiopeia
Distance: 7,100 light-years
Object type: Emission nebula


The Bubble Nebula is a very intriguing object in our Milky Way galaxy: a massive star trapped inside a bubble generated by the hot gas ejected by a super-hot, massive star in the form of stellar winds. This emission nebula is and 7 light-years across is located about 7,100 light-years away in the Cassiopeia constellation.

This part of the sky is very rich and the image also includes:

  • M52 – Cassiopeia Salt-and-Pepper cluster. This is a bright open cluster that contains around 200 stars, and lies between 3,000 – 7,000 light years from Earth. It was discovered by Charles Messier on 1774.
  • V1405 Cas: this is a spectacular nova, a massive thermonuclear explosion from the surface of a white-dwarf star, which erupted on 18 March 2021.
  • NGC 7538 – Northern Lagoon Nebula. This is a region of massive-star formation located around 9,000 light-years away. It consist mainly of hydrogen gas and small amounts of cosmic dust.


Mount: Celestron Evolution
Main Telescope: William Optics ZS73EDii
Main camera: ZWO ASI183MC-Pro
Main camera filter: Optolong L-eNhance

Acquisition details

Total integration time: 3 hours
Acquisition: SharpCap Pro
Processing: APP – PixInsight
Location: Luxembourg

Where the universe begins…