Bubble Nebula and M52

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The Bubble Nebula (NGC 7635) and the open cluser M52 is a classic pair of objects on the border between Cepheus and Cassiopeia. The field is rich in other objects, such as the large red nebula encircling the bubble, named Sh2-162, the dark nebula on the top-right of the bubble is LDN 1230, the faint and small nebula on the right of the bubble is Sh2-159, the large and faint red nebula on the top-right border is LBN 547 and Sh2-161. Curiously the relatively bright red nebula near the right border seems not to have a proper catalog number, and is part of the larger Sh2-161. The small yellow nebula near the lower border (a little toward the right) is GN 23.15.3. The dark nebulas near the upper-right corner are LDN 1228 and 1229.

Technical Data
Optics TEC 140
Focal Length
1011 mm
Focal Ratio f/7.2
Exposure Time 3h40m (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
23 August 2012
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +12°C, RH=45%
Sky brightness at zenith (with SQM-L) 21.5 mag/arcsec^2
Notes .

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