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Deep Sky Nebula

Diffuse nebulae in Cygnus

At the beginning of the holiday in Northumberland we had an evening where the cloud passed through just as the moon was setting. Having a restricted southern horizon I looked instead to the East where Cygnus was rising and decided to image the region around the bright star Sadr. Some puzzling over the hit or miss drifting I’d been getting with the AstroTrac lead me to the conclusion that I needed the polar scope on the left side of the mount to get good results. This has subsequently been confirmed by some recent posts on the Yahoo group and the problem is due to the scopes being manufactured with the tubes slightly misaligned. There is a mod available to correct this that involves fitting a collar with three grub screws around the tube. This will be worth a closer look.

Polar alignment was pretty close on this occasion so I took 16x 3 minute exposures with the ZS70 and unmodified Canon 350D and stacked the results.

 

 

The bright star to the left of centre is Sadr. There is an open cluster (NGC 6910) to the left of Sadr. The remainder of the image consists of HII emission nebulae that are catalogued in the DWB index. One Barnard catalogue object (B344) is visible just to the right of the bright orange star top centre of the image.

 

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