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Contains:  Bubble nebula, NGC 7635
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Bubble Nebula, 





    
        

            Metsavainio
Bubble Nebula

Technical card

Resolution: 1412x1091

Dates:Oct. 4, 2009

Frames:
Baader Planetarium H-Alpha Filter: 21x1200" -30C bin 1x1
OIII: 5x600" -30C bin 3x3
SII: 10x600" -30C bin 3x3

Integration: 9.5 hours

Darks: ~17

Flats: ~17

Bias: ~100

Avg. Moon age: 15.00 days

Avg. Moon phase: 99.94%

Bortle Dark-Sky Scale: 9.00

Astrometry.net job: 87148

RA center: 350.163 degrees

DEC center: 61.179 degrees

Pixel scale: 0.840 arcsec/pixel

Orientation: -101.424 degrees

Field radius: 0.208 degrees

Locations: Astro Anarchy Observatory, Oulu, Finland, Finland

Description

Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. Star colors are mixed from the NB channels, Red=H-a, G=O-III and B= 85%O-III + 15%H-a.This composition is very close to a visual spectrum.

This is one of the most interesting looking structures in a sky.
NGC 7635 aka "Bubble Nebula, Sh2-162 or Caldwell11, is a Hydrogen emission nebula in constellation Cassiopeia. It locates near the open cluster M 52 at distance of about 11.000 light years from the Earth.
The bubble structure is created by a strong stellar wind, a radiation pressure, from massive hot magnitude 8,7 central star, SAO 20575, it can be seen in an image inside of the bubble, off centered at Right.
Bubble is an expanding shock front inside a giant molecular cloud and it has a diameter more than Six light years. The spherical formation is expanding at speed of 6500.000 km/h, due the huge scale and distance we can't see the movement easily. In a century, the bubble in this image will be only about one pixel wider, than now! ( ~1 arc second)
Strong UV-radiation from a central star ionized elements in a gas and makes them glow at typical wavelength to each element. (Hydrogen glows Red light as Sulfur, Oxygen emits Green/Blue light at visible wavelengths)

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Metsavainio
Metsavainio
License: None (All rights reserved)
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Bubble Nebula, 





    
        

            Metsavainio