NGC 7635 in the constellation Cassiopeia

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NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia.

Amateur observation

With an 8 or 10-inch (250 mm) telescope, the nebula is visible as an extremely faint and large shell around the star. The nearby 7th magnitude star on the west hinders observation, but one can view the nebula using averted vision. Using a 16 to 18-inch (460 mm) scope, one can see that the faint nebula is irregular, being elongated in the north south direction.

Imaging telescopes or lenses: GSO Newton 8″ f/5
Imaging cameras: Canon EOS 350D / Digital Rebel XT
Mounts: Sky-Watcher EQ6 Syntreck
Guiding telescopes or lenses: GSO Viewfinder 8X50
Guiding cameras: Orion SSAG
Software: Iris, PHD guiding, photoshop
Filters: Astronomik CLS CCD Filter
Dates: July 22, 2012
Locations: Perigord
Frames: 53×480″
Integration: 7.1 hours

Author: Fredéric Segato

AstroPhotography of the day by SPONLI
8 Abril 2014