Planetary nebula HFG1
Douglas Struble, Taylor, Michigan, USA, 10 November 2018 and 26 November 2020
Douglas says: “This planetary nebula in the constellation of Cassiopeia is one of the most challenging objects I’ve ever processed, even with over 90 hours of data. I think I’ve reached the limit for my aperture now, given the highly light-polluted skies here just outside Detroit.”
Equipment: ZWO ASI 1600MM Pro camera, Stellarvue SVX102T-R and Explore Scientific 152mm apo triplet refractors, Astro-Physics GTO-Mach 1 and Orion Atlas Pro mounts
Exposure: 93.4h total
Software: SGPro, PixInsight, Photoshop
Douglas’s top tips: “Planetary nebulae respond best to narrowband filters for Ha (Hydrogen-alpha) and OIII (Oxygen III). With my light pollution, a 7nm or 6nm Ha filter is typically fine, but for OIII I find a narrower band is…