Hemisphere:  Southern  ·  Constellation: Aquarius (Aqr)  ·  Contains:  Helix nebula  ·  NGC 7293  ·  NGC7293  ·  PK036-57.1
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NGC 7293, Helix Nebula, 13 Sep 2012, 


            David Dearden
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NGC 7293, Helix Nebula, 13 Sep 2012

Imaging telescopes or lenses: Astro-Tech AT8IN

Imaging cameras: Meade DSI II C

Mounts: CG5

Guiding telescopes or lenses: Orion ShortTube 80 f/5

Guiding cameras: Meade DSI

Focal reducers: High Point Scientific Coma Corrector Photo & Visual For Netwonian Telescopes 2"

Software: PHD guiding  ·  photoshop  ·  Noel Carboni's Astro Tools for PhotoShop  ·  AstroPlanner  ·  Stellarium  ·  Nebulosity

Accessory: HB Home-built TEC1-12706 cooler  ·  Orion AccuFocus

Dates:Sept. 13, 2012

Frames: 42x300" (3h 30')

Integration: 3h 30'

Avg. Moon age: 26.80 days

Avg. Moon phase: 8.20%

Astrometry.net job: 158198

RA center: 22h 29' 34"

DEC center: -20° 49' 43"

Pixel scale: 1.865 arcsec/pixel

Orientation: -176.601 degrees

Field radius: 0.250 degrees

Resolution: 733x628

Locations: Mapleton Lateral Observatory, Mapleton, Utah, United States


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.


Sky plot

Sky plot


NGC 7293, Helix Nebula, 13 Sep 2012, 


            David Dearden