Derby and District Astronomical Society



Asterisms

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This image of The Coathanger, or Brocchi's Cluster, within the constellation of Vulpecula, was captured by Peter Branson on the 14th July 2022. It comprises 3 separate images of 8x120seconds - 16 minutes for each photo. The camera used was a ZWO ASI533 cooled colour camera together with a TS Optics Photoline f7 telescope with a Hutech IDAS light pollution filter and field flattener attached mounted on an NEQ6 mount. A filter wheel fitted with LRGBHa filters was used to capture just the L (Luminance) component. The images were stacked in Nebulosity, then PixInsight was used to remove background gradients and noise and some further post-processing including using levels and curves. The three separate square frame images were combined in Microsoft Images Composite Editor (ICE).   Image © Peter Branson



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