01  May  2017
NGC 7635 The Bubble Nebula


  By  Luis Romero Ventura  
www.astrosirius.org )


  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.
Source: Wikipedia
Details Photo:

Location: Àger-Lleida-Spain
Dates: 06-07 Sep 2016 & 30-31 Oct 2016 & 2-6 Dec 2016
SQM: 21 - 21.4
Telescope: GSO RC14” Truss f8
Camera: Moravian G3-11000 classe 2
Focuser: Feather Touch 3” Kit boss II
Flattener:  TSFlattener 2.5”
Filters: Astrodon LRGB Gen2 I-Series True-Balance
Exposures: L:22x600 sec bin1 R:G:B: 17:17:17 seg x 900 sec bin2
H-alpha: 34 x 900 sec bin1
Total Exposure: 20.6 h
Processing: Pixinsight & Photoshop CC 2015.5


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