NGC7635 - Bubble Nebula  
Cassiopeia

HII Emission nebula		  
 
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 15 ± 5 M☉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.

With an 8 or 10 inch 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 scope, one can see that the faint nebula is irregular, being elongated in the north south direction.		  
 
Technical details:  
Location:  
 Soria - Spain
Date:  
 30/07/2007 (dd/mm/yyyy)
Conditions:  
 Good
Temperature:  
 13ºC
Humidity:  
 
Telescope:  
 Meade SC8" f/10
Reducer/corrector:  
 f/6.3 Meade
Filter:  
 Baader Ha 7nm 2"
Mount:  
 Vixen GPD2 Autostar Meade
Camera:  
 Canon 300D Schott filter
Exposure:  
 6x600s, ISO800
Guiding tube:  
 Skylux 70/700 f/10, barlow x2
Guiding camera:  
 Celestron NexImage
Guiding software:  
 K3CCDTools
 
Procesing:  
 Calibrado, alineado y apilado. Histogramas, curvas y wavelets con PI. Reducción de ruido.  
Notes:  
 Buenos datos de seguimiento, noche clara y con atmósfera muy estable, aunque con Luna. Segundo procesado de esta toma H-alfa.  
     

 
All Contents Copyright by Jaime Fernández and Copyright of their respectives owners. Text mainly extracted from Wikipedia.
All Jaime Fernandez propietary contents freely available for non-profit purposes,
otherwise I beg you for a fair contribution to NGO Medicos Sin Fronteras proportional to the profit obtained.

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