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NGC246 "Skull"
Barry Brook is a University professor from Tasmania, Australia. He does astronomy from his 'Huon Ridge Observatory' in the dark southern skies lat 43S. He's had a life-long interest in astronomy, forged from his teen years in the 1980s when he was lucky enough to live on site at Siding Spring Observatory Australia's largest professional optical observatory where his Dad worked as an engineer. After years as a visual-only enthusiast, he has recently developed a passion for astrophotography. With endless wonderful southern-sky targets to capture, he'll be kept busy for many years! His Astrobin collection is at http://www.astrobin.com/users/Amaranthus
Details
Date Taken: 09/20/2014
Photographer: Barry Brook
Location: Adelaide, Australia
Other Telescope: SW120 f/5 achromat
Mount: Orion Thin Off-Axis Guider for Astrophotography
Other Mount: AZ-EQ6
Camera: Orion StarShoot G3 Deep Space Monochrome Imaging Camera
Other Camera: ZWO ASI120MM-S guide camera
Processing: Startools, Nebulosity, Deepskystacker
Exposure: 18x1200 sec Ha, 18x960 sec OIII, RGB stars
Other Equipment Used: Tele Vue 0.8x FF/FR
Notes: NGC 246, "The Skull", is a eerie-looking planetary nebula in the constellation Cetus, about 1600 light years distant. It has an angular diameter of 4.5'. The central white dwarf part of a binary was mag 9 in 1930 but has since dimmed to mag 12. The complex braided structure is a result of shock waves as the dying star expelled its outer layers. The image was captured in narrowband from suburban Adelaide, using an Skywatcher 120 mm achromat refractor at f/4, mounted on an AZ-EQ6. This telescope is excellent for narrowband work as it has a decent aperture, fast focal ratio, and under these conditions, doesn't suffer from CA. The CCD camera was an Orion StarShoot G3 mono dithered and drizzled, guided with PHD2 using a thin OAG and an ASI120MM-S guide camera. The image is composed of the following: Ha = 18 x 20 min OIII = 18 x 16 min R, G

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