Sunday, October 19, 2025

The Ghost of Cassiopeia Seestar S50

This image of the Ghost of Cassiopeia has 12 hours of total integration time with the astro filter, including 1.5 hours of narrowband data. The inidividual exposures were 20 seconds each. I live in Bortle 8/9 skies, so the non-narrowband image had horrible light gradients which took a lot of processing in Graxpert and Affinity 2 to remove. I stacked, stretched and star processed in Siril, and did other work in Cosmic Clarity, Seti Astro and Affinity. The Ghost of Cassiopeia is region containing both emission and reflection nebllas. It is energized by the giant star Gamma Cassiopeia, which can be seen at the edge of the image. The star is 55,000 brighter than our sun and 19 times its mass.

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NGC 2244 with the Seestar S50--a 6-hour integration

NCG 2244, the Satellite Cluster, is located in the Rosette Nebula. This image of the cluster's brightest stars is a 6-hour capture (20-s...