NGC 7293, Helix Nebula, 13 Sep 2012 (David Dearden)

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

NGC 7293, Helix Nebula, 13 Sep 2012

Found visually on the first try. Some gusty wind tonight. CCD starts at 9 °C. High dither settling at 0.4. CCD ends around 0 °C. The last dozen frames were with the scope pointed below the horizon, so I'm using them as matched darks. The image turned out very nice; the best I've yet done with the Helix Nebula.

Date: 13 Sep 2012

Subject: NGC 7293, Helix Nebula

Scope: AT8IN+High Point Scientific Coma Corrector

Filter: None

Mount: CG-5 (Synta motors)

Guiding: Orion ST80 + 0.5x Antares telereducer + DSI Ic + PHD

Camera: DSI IIc (cooled at 2 A, 7.5 V, 9 to 0 °C)

Acquisition: Nebulosity 3.1.1

Exposure: 42 x 300 s

Stacking: Neb 3, bias included, normalize first, trans+rot align, 1.5 SD stack

Processing: Digital development with aggressive sharpening, heavy Keller stretch, power stretch, saturation boost, GreyCStoration in Neb 3; CS6 Astronomy Tools star color enhance, color blotch, deep space, space noise reduction, color range select background greys and desaturate them.

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Status	Basic success
Started	...
Astrometry.net job	6572024
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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