Sh2-132 in Cepheus

Click on the image for a higher res version

This large nebula is quite faint, at least when imaging with a one-shot colour sensor like my DSLR. Interestingly the lower part of the nebula is blue coloured and also a small hint of blue is present near the brightest part. The resemblance of the whole subject seems to me a small dog (such as a "poodle"). Some dark nebulas are visible, such as LDN 1149 and 1154 on the upper-right. The field is very rich in stars because of the location, in the middle of Cepheus Milky Way. An H-alpha image of the same subject, shot with the Schmidt Camera, is here.

Technical Data
Optics TEC 140
Focal Length
1011 mm
Focal Ratio f/7.2
Exposure Time 4h30m (single exp of 10 min)
CCD Canon EOS 5D with Baader filter
Sensitivity 800 ISO
Location Colle dell'Agnello (CN, Italian Alps) at 2700 m height
19 August 2012
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +14°C, RH=40%
Sky brightness at zenith (with SQM-L) 21.2-21.4 mag/arcsec^2
Notes .

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