Derby and District Astronomical Society


This image of the Garnet Star (Mu Cephei or Erakis) was taken by Peter Branson on the 15th July 2022. The image is made up from 30 x 30s separate images - a total exposure of just 15 minutes. The images were taken with 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 these images (Luminance only). 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. Peter says - "The Garnet Star just shines out in the image. The colours in all the stars in the image have been enhanced to show the richness of the colours in the whole scene."   Image © Peter Branson