The Double Cluster (Caldwell 14) in Perseus is a great target for a widefield imager like the RASA 8. The Double Cluster is relatively young—about 14 million years old. The central clusters and surrounding halo have a mass of more than 20,000 suns. The clusters are moving towards the Earth at a speed of about 24 miles per second. Most images of the clusters do not show any nebulosity, because most images do not use narrowband filters. Under the bright skies of the CSO, I used an NBZ narrowband filter, and the surrounding H II nebulosity is faintly visible in this image.
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