Modified Canon 1100D through a Teleskop-Service 200mm Ritchey-Chretien reflector. A Hutech IIDAS-LPS-V4 nebula filter was used.
A total of 25 x 5 min exposures at ISO 800.
The bubble is well-delineated, while there are many signs of hydrogen (H II) nebulosity.
It was called 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 star has the designations SAO 20575 and BD+60 2522.
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. It lies at a distance of 7,100 to 11,000 light years.
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.
The bright star to the right of the nebula is HD220057 (HIP115198), a blue subgiant star shining at Mag 6.94
Date: 27/09/2015
