NGC 7635, commonly known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an H II region emission nebula located in the constellation Cassiopeia. It is situated near the open cluster Messier 52. The nebula's characteristic "bubble" shape is formed by the stellar wind from a massive, hot central star, SAO 20575 (BD+60°2522), which has an apparent magnitude of 8.7. This nebula is adjacent to a giant molecular cloud that both contains and is illuminated by the expanding bubble, causing it to emit a glowing light. William Herschel discovered the Bubble Nebula in November 1787. The central star, BD+60°2522, is estimated to have a mass of about 44 times that of the Sun (44 M☉)..

Object: NGC7635

Location: Les Domaine des Ormes, France

Mount: Alt Az

Bortle Scale: 4

Nights:       4th August 2024

Total Subs Used: 270 x 10 Subs

Seeing:  Clear 

Fits Stacked: Siril

Post-Processing Steps

1. GraXpert - Background extraction and Denoise v2.0 

2. Siril - colour calibration, photometric colour calibration, removing green noise, colour calibration, histogram stretch, colour saturation.

3.  Lightroom

NGC 7635, commonly known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an H II region emission nebula located in the constellation Cassiopeia. It is situated near the open cluster Messier 52. The nebula's characteristic "bubble" shape is formed by the stellar wind from a massive, hot central star, SAO 20575 (BD+60°2522), which has an apparent magnitude of 8.7. This nebula is adjacent to a giant molecular cloud that both contains and is illuminated by the expanding bubble, causing it to emit a glowing light. William Herschel discovered the Bubble Nebula in November 1787. The central star, BD+60°2522, is estimated to have a mass of about 44 times that of the Sun (44 M☉)..

Object: NGC7635

Location: Les Domaine des Ormes, France

Mount: Alt Az

Bortle Scale: 4

Nights:       4th August 2024

Total Subs Used: 270 x 10 Subs

Seeing:  Clear 

Fits Stacked: Siril

Post-Processing Steps

1. GraXpert - Background extraction and Denoise v2.0 

2. Siril - colour calibration, photometric colour calibration, removing green noise, colour calibration, histogram stretch, colour saturation. Star reduction script. AstroSharp

3.  Lightroom