HCG 44 / Arp 316, Galaxy Cluster in Leo, 20 Mar 2015 (David Dearden)

Celestial hemisphere: Northern · Constellation: Leo (Leo) · Contains: NGC 3185 · NGC 3187 · NGC 3189 · NGC 3190 · NGC 3193

HCG 44 / Arp 316, Galaxy Cluster in Leo, 20 Mar 2015, David Dearden

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HCG 44 / Arp 316, Galaxy Cluster in Leo, 20 Mar 2015

This galactic cluster always proves challenging for me. I thought I'd try it on an extremely dark night, go to 600-s subs, and use only the UV-IR cut filter. It is still challenging. I continue to have guiding problems; it is just hard to guide well enough with my rickety old mount when using my tightest imaging scale. I tried both my "normal" workflow in Nebulosity and using 2x drizzle stacking in Deep Sky Stacker; I think the DSS drizzling worked better, and here is the result. I didn’t want to darken the background too much, because the ring galaxy at upper left has a faint outer ring I didn’t want to disappear.

Date: 20 Mar 2015

Subject: HCG 44 / Arp 316, Galaxy Cluster in Leo

Scope: Astrotech AT8IN+High Point Scientific coma corrector

Filter: Baader Fringe Killer

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 0 °C)

Acquisition: Nebulosity 3.3.3, no dither

Exposure: 29x600 s

Stacking: Neb 3.3.3, bad pixel map, bias included, 33 flats, histogram match, deBayer & square. DSS 2x drizzle app (1.5)-sigma combine.

Processing: StarTools 1.3.5.289 Crop; Wipe:76%; Develop: 83.33%; HDR:Reveal core; Color:Scientific, 200%, cap green to yellow; Deconvolute 2.0 pix; Track 6.7 pix; Magic:Shrink 2 pix. Photoshop CC 2014 + Carboni Astronomy Tools Deep space noise reduction (2x); Star color enhance; GradientXterminator; Astroframe.

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Status	Advanced failed
Started	...
Astrometry.net job	582949
PixInsight job	PY7VWO2H8R2DRPAWYLKMYG87096HLNGD
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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HCG 44 / Arp 316, Galaxy Cluster in Leo, 20 Mar 2015

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