NGC 7293, Helix Nebula, 5 Sep 2015 (David Dearden)

Celestial hemisphere: Southern · Constellation: Aquarius (Aqr) · Contains: Helix nebula · NGC 7293

NGC 7293, Helix Nebula, 5 Sep 2015

Wanted to try and go deeper on the Helix by using a focal reducer and 600 s subframes. Much cooler tonight (14 °C) than it has been all summer. Some wind gusts, but pretty good conditions. RA tracking is not great, whereas DEC is pretty good. Usually this is a balance issue. No need to meridian flip on a target this far south. The Helix would probably benefit from some additional Hα, and of course OIII would help but I don't have an OIII filter.

Date: 5 Sep 2015

Subject: NGC 7293, Helix Nebula

Scope: AT8IN + Antares 0.5x Telereducer

Filter: Baader UHC-S

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

Guiding: 9x50 Finder/Guider + DSI Ic + PHD 2.5.0.1 (Win 7 ASCOM)

Camera: DSI IIc, no chiller CCD 14 °C

Acquisition: Nebulosity 4.0.2, no dither

Exposure: 26x600 s

Stacking: Neb 4, bad pixel map, bias included, match histograms, deBayer & square, trans+rot align, DSS 2x drizzle 1.75 κ-σ stack.

Processing: StarTools 1.4.305 Crop; Wipe 75%; Develop 80.71%; HDR Optimize soft; Color: Scientific 200%; Deconvolute 3.0 pix; Track 6.0 pix, Smoothness 88%; Magic:Shrink 1 pix; Repair:Warp; heal out stars & sharpen, add stars back. CS6 Astronomy Tools repeated space noise reduction with layer masks to reduce effects on nebula; repeated levels & curves; increase star color; Astro Frame.

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Status	Advanced failed
Started	...
Astrometry.net job	764978
PixInsight job	Z2IVWWFLX6T2L2YOTHIT6UXFGQJ3U9A8
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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