D Cluster (Collinder 21)
The D Cluster (Collinder 21) is an asterism located in the northern constellation Triangulum. It appears near Mothallah (Alpha Trianguli), one of the three bright… Read More »D Cluster (Collinder 21)
Brocchi’s Cluster
The Coathanger (Brocchi’s Cluster)
The Coathanger is an asterism located in the northern constellation Vulpecula (the Fox). With an apparent magnitude of 3.6 and an apparent size of 60… Read More »The Coathanger (Brocchi’s Cluster)