NGC 3198, 19 Mar 2015 (David Dearden)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 3198

NGC 3198, 19 Mar 2015

Found very easily by initially synching on ψ UMa and using the PicGoto. This is a beautiful little galaxy. I'm wondering if I would have been better off withouth the UHC-S filter. I had a lot of guiding issues as well, probably due to non-optimal balance (balance is critical with my finicky old mount). Finally, my primary mirror has gotten absolutely filthy so I really do need to clean it. Attempted a drizzle stack for this, but it looks better without drizzling I think. Nevertheless, the image turned out OK but not great.

Date: 19 Mar 2015

Subject: NGC 3198, spiral galaxy in UMa

Scope: Astrotech AT8IN+High Point Scientific coma corrector

Filter: Baader UHC-S

Mount: CG-5 (Synta motors, PicGoto Simplificado)

Guiding: 9x50 Finder/Guider + DSI Ic + PHD 2.4.1 (Win 7 ASCOM)

Camera: DSI IIc no cooling (about 10 °C)

Acquisition: Nebulosity 3.3.3, no dither

Exposure: 23x600 s

Stacking: Neb 3.3.3, bad pixel map, bias included, 33 flats, histogram match, deBayer & square, trans+rot align, 40-60% median combine.

Processing: StarTools 1.3.5.289 Crop; Wipe: Develop: 87.49%; HDR

ptimize; Color:Scientific 248%; Deconvolute 3.0 pix; Life:Moderate; Track 5.4 pix; Magic:Shrink 1 pix. Photoshop CC 2014 + Carboni Astronomy Tools Deep space nr; layer masked space nr; Increase star color; Astroframe.

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Status	Advanced success
Started	...
Astrometry.net job	578672
PixInsight job	VFL15LZ6CZGPHDU0X53ZPJWJ2IEJFSQD
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	10h19m53s.58
RA (top/left)	10h18m43s.16
RA (top/right)	10h21m02s.10
RA (bottom/right)	10h21m04s.36
RA (bottom/left)	10h18m44s.80

Dec (center)	+45°33′17″.4
Dec (top/left)	+45°23′46″.7
Dec (top/right)	+45°23′21″.1
Dec (bottom/right)	+45°42′45″.0
Dec (bottom/left)	+45°43′11″.7

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