The Bubble Nebula - NGC 7635 in Cassiopeia

The Bubble is a HII region, a bubble of hydrogen gas ionized by the UV radiation of a hot star inside it.

Images taken: Nov. 4 & 6, 2007, by April Smith.

Telescope: Meade 12 in at f/5.91 (f=71 in).

Camera: SBIG ST-10 CCD camera.

Image size: 20 am x30 am, image rescaled to 1 as/pix; North is up.

Exposures: 20min red, 20 min green, 2x20 min blue (1 hour 20 min total).

Images taken: Nov. 12, 2006, by Anslee Moon and Emily Thrash.

Telescope: Meade 12 in at f/6.55 (f=2m).

Camera: SBIG ST-10 CCD camera.

Exposures: 2x10min red, 3x10 min green, 3x10 min blue (1 hour 20 min total).

The glow in the bottom of the image is due to a reflection on the side of faulty baffle of the Meade telescope.

Images taken: Nov. 6, 2005, by McDaniel Wicker and Kimberly Kilpatrick.

Telescope: Meade 12 in with f/5.6 focal reducer (f=67in), guided with an AO-7 adaptive optics accessory.

Camera: SBIG ST-7 CCD

Exposures: 2x20min red, 2x20 min green, 3x20 and 1x15 min blue (2.5 hours total).