designed by Lluís Romero Ventura
The Earth astrosirius@astrosirius.org

NGC 7635 THE BUBBLE NEBULA

NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia. It lies close to the direction of the open cluster Messier 52. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star, SAO 20575 (BD+60°2522). The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow. It was discovered in 1787 by William Herschel. The star BD+60°2522 is thought to have a mass of about 44 M☉. 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.[6] 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.

NGC 7635 THE BUBBLE NEBULA

Place: Ager-Lleida-Spain SQM: 21.5 Dates: 06-07-SEP / 30-31 OCT / 2-6 DEC 2016 Details Telescope: GSO RC14 Truss Mount: ASA DDM85 Camera: Moravian G3-11000 Focuser: Feather Touch 3 Kit Boss II Flattener: TS 2.5 Filters: Astrodon LRGB Gen2 I-Series True-Balance Exposure: L:14x600 sec bin1 RGB: 34x300 sec bin2 H-Alpha: 26x900 sec bin1 Processing: Pixinsight & Photoshop CC Software: MaximDL, Sequence,Autoslew Control Remote: Talon6

Nebula

& Dust