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Only a limited number of planetary nebulae are directly associated
with star clusters. Such associations provide an opportunity for
accurate distance measurements to the nebula, thereby enabling precise
estimations of physical dimensions and enhancing our understanding of
stellar dynamics. NGC 2818A is one example of a planetary nebula with
this connection. Mark’s contribution includes the discovery of a
previously unreported O III envelope surrounding the nebula. At a
distance of approximately 11,000 light years, its actual size is
estimated to be around 23.5 light years. Further details can be found
in the original publication.
NGC 2818A. Upper Left: original 8.5 hr OII Image.
Upper Right: starless version of the same image. Bottom: HOO version
of the image. Image Courtesy RRNAAS Mark’s discovery images were produced using a total integration
time of 8.5 hours using our C5-150M camera.
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