The Trumpler class of this cluster is II 2 m, indicating it is medium-rich in stars (m) with a moderate brightness range (2) and little central concentration of the stars (II).[6] It has about 260 members[2] and an age of approximately 65million years,[4] although estimates range from 50 to 80 million.[6] A total of fifteen B-typevariable stars have been detected in the cluster with four Be stars. Five of the cluster members show hydrogen alpha emission, including a γ Cas and two λ Erivariables.[6]
