This week we feature V509 Cassiopeiae, a yellow hypergiant star (one of 2) in Cassiopeia. This is 3-hours of 4-minute subs taken on the Sky90 array with the M26C OSC CCDs. I appear to have been very remiss in not capturing the other yellow hypergiant star in Cassiopeia, namely Rho Cassiopeiae, and I will attempt to rectify that as soon as possible using the Hyperstar IV.
