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Friday, October 18, 2013

The second image of the Autumn season 2013. Sharpless 132

Sh2-132, an emission nebula in Cepheus
Ra 22h 19m 20s Dec +56° 06′ 00"

Image is in mapped colors, from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
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A starless version

An experimental starless image to show the actual nebula better.
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Sharpless 132 is a very faint emission nebula, it locates at the border of Cepheus and Lacerta. Distance is about 10.000 light years. This image covers about 210' x 160', that's about 3,5 x 2,7 degrees. Resolution is 3,79 arc seconds/pixel.
In this final version, a strong O-III area is visible as a Blue color in both color palettes. There is some S-II in the area too but it's weak.

Image in visual colors

Image is in Natural color palette from the emission of ionized elements,
R=Hydrogen + Sulfur, G=Oxygen and B=Oxygen + Hydrogen.
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A wide filed image of the Sh2-132
A blogpost about this older image of mine can be found HERE.

Image is shot with a Tokina AT-X camera lens,  QHY9 , a cooled astronomical camera, and the Baader narrowband filters. O-III and S-II channels from this image are used for new images colors.
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Technical details

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
A light, 33 iterations, deconvolution added at 50% weight in CCDStack2.
Levels, curves and color combine in PS CS3.

Optics, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO, an active optics unit, and Lodestar guide camera
Image Scale, ~0,8 arc-seconds/pixel
12 x 1200s exposures for H-alpha emission = 4h.
O-III and S-II channels are from an older wide field image.

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