M31 / NGC 224 Andromeda galaxy: intergalactic void doesn’t scare me

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M31 / NGC 224 Andromeda galaxy: intergalactic void doesn’t scare me
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Image by Sergei Golyshev (AFK during workdays)
But this particular object appeared to be a hard cookie. It requires much longer exposure then I have achieved yet. About one hour would be much better so I know there to go.

Aquisition time: 10.11.2012 19:51 MSK (GMT+4).
Equipment:
Canon EF 70-200 f/2.8L lens @200 mm on EOS 60D mounted on Celestron CG-4 GEM (German equatorial mount) with RA drive.
Aperture 71 mm
Focal length 200 mm
Tv = 30 seconds
Av = f/2,8
ISO 500
Exposures: 23/25 (two was ruined by a satellite and an airplane)
Processing: color channels of every single exposure were summed to obtain 32 bit image. All 23 32 bit frames were stacked and registered in ImageJ using StackReg plugin and the final sum was produced. To obtain a background value I have measured modal intensity of starless area in the lower right corner and substracted this value from all of original frames prior to making a sum. Contrast was enchanced in PS.
Notes: what happens with 4,3m if it is spread across 3 degrees of arc? It turns into a luminescent mist…

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