C28
NGC 752
Properties
Position & Identifiers
Visibility
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About C28
Description
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.
Observing Tips
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.
History
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.
Fun Facts
NGC 752 is old enough that its most massive stars have already evolved off the main sequence, leaving a characteristic red giant branch that helps astronomers test stellar evolution theories.
Community Photos (1)
Credit: Roberto Mura. License: CC BY-SA 3.0. (Wikimedia Commons)
Skybred Mar 2, 2026