C28

NGC 752 is a large, sparse open cluster in Andromeda, about 1,300 light-years away. At roughly 1.1 billion years old, it is one of the older open clusters and spans a generous 50 arcminutes across the sky.

Best in binoculars or a wide-field telescope at low power, as the cluster is too large for typical eyepiece fields. About 60 stars from magnitude 8-10 are spread across nearly a full degree. Best in autumn and winter evenings.

Possibly observed by Giovanni Battista Hodierna before 1654. Independently found by Caroline Herschel in 1783. One of the benchmark clusters used to calibrate stellar evolution models.