Bubble Nebula NGC 7635 and M 52

2011-09-16 – 25, Hα+OIII+SII


45 %

Image data

Photographer:Jürgen Stöger
Optics:Takahashi FSQ106ED f/5 (main)
Scopos ED66 (guide)
Mount:Fornax 51
Cameras:Atik 383L+ (main)
Starlight SXV-M7 (guide)
Exposure:Hα=180 min, [OIII]=190 min, [SII]=210 min
Conditions:about 5 mag
Moon:38 % illuminated fraction
Date:16, 24+25 September 2011
Remarks:Image processing cooperation with Gerald Wechselberger and Franz Gruber

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. 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.

Object information

NGC 7635
RA: 23h20.7m
Dec: +61° 12′
Size: 15×8′
Distance: 7100 light years
M 52
RA: 23h24.2m
Dec: +61° 35′
Size: 12′
Distance: 5000 light years

IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg)

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