However, Robert Burnham, Jr. has proposed that the 1st century astronomer Ptolemy may have seen it with the naked eye while observing its neighbor the Ptolemy Cluster (M7).
Tetapi Robert Burnham, Jr mengusulkan bahwa astronom abad pertama, Ptolemy mungkin melihat gugus ini dengan mata telanjang ketika mengamati Gugus Ptolemy (M7) yang terletak sangat dekat.