Telescope: TEC140 f/5.2
Mount: Paramount MyT
Exposure: (SII,Ha,OIII) 22h Ha 31x900s, SII 33x900s, OIII 25x900s bin x1, binx2
Date and place: 08.2019, Observatory E-EyE, Fregenal de la Sierra, Spain
The Bubble Nebula is an emission nebula located in the northern constellation Cassiopeia. The nebula lies at a distance of 7,100 to 11,000 light years from Earth. It is also known as Caldwell 11 or Sharpless 162. Its designation in the New General Catalogue is NGC 7635. It was nicknamed the Bubble Nebula because of its shape, which was created by a strong stellar wind from a young, massive, hot Wolf-Rayet star that shed its material to form the nebula. The Bubble Nebula has an apparent magnitude of 10 and is about 10 light years in diameter. The central star has a magnitude of 8.71 and a mass about 44 times that of the Sun. The star’s radiation ionizes the bubble-shaped shell, causing the nebula to glow. The stellar wind and radiation from the star are responsible for the nebula’s shape.