IC 1805, Hearth Nebula

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IC1805 is a large nebula on the border between Cassiopeia and Perseus. The name "Hearth" is from the shape, that in this image is only partial due to the limited imaging field.
This image include many parts with different catalogue names: IC 1805 is the open cluster near the center, the main nebula is Sh2-190, or LBN 655 and 654; Ced 6a and 6b are the bright patch on the right (also named LBN 645-646-648); many dark nebulas are catalogued as LDN objects.

Technical Data
Optics TEC 140
Focal Length
1011 mm
Focal Ratio f/7.2
Exposure Time 3h10m (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
21 August 2012
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= +13°C, RH=60%
Sky brightness at zenith (with SQM-L) 21.5-21.6 mag/arcsec^2
Notes North up, inclinated 20° toward the right.

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