NGC 891, Outer Limits Galaxy, 7 Nov 2012 (David Dearden)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: NGC 891

NGC 891, Outer Limits Galaxy, 7 Nov 2012

Maybe I was lucky, but this was a pretty easy find because after my first try with the Telrad I recognized a 3-star asterism and a 2-star asterism that were in the AT8IN field of view chart in AstroPlanner. So it was a simple matter to move over and find the galaxy. Since I knew what I was looking for, it was easy to see in 5 s in the imaging scope. I can also see it in the guide scope at 1.5 s, again because I know where to look. I'm still guiding at the 4x setting, and I've also loosened up the worm side-to-side adjustment a bit, reasoning that I don't really care about backlash in RA. So we'll see how this turns out. Chiller at 7 V, T=5 °C. Medium RA dither, settling at 0.5.

Date: 7 Nov 2012

Subject: NGC 891 (Outer Limits Galaxy)

Scope: AT8IN+High Point Scientific coma corrector spaced properly

Filter: None

Mount: CG-5 (Synta motors)

Guiding: Orion ST80 + DSI Ic + PHD 1.13.7

Camera: DSI IIc (1.8 A, 7.0 V T = 5 °C)

Acquisition: Nebulosity 3.1.2, medium RA dither, settling at 0.5

Exposure: 40/44 x 300 s

Stacking: Neb 3, bad pixel map & flats, bias included, normalize first, trans+rot align, 1.5 SD stack

Processing: Neb 3 crop and autocolor balance. StarTools 1.3 develop, sharpen, color wipe, color saturation, life, magic (star shrink). CS6 star color enhance, star shrink, curves.

Original
Final
B

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Status	Basic success
Started	...
Astrometry.net job	7372435
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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