M28 (NGC 6626)
Globular cluster in Sagittarius
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M28 is about 19,000 light years distant and comprised of at least 50,000 stars, including 18 known RR Lyrae variables, a W Virginis variable, and a second long period variable.
Image credit: www.mistisoftware.com -
An original Messier discovery in 1764, one of M28's claims to fame is being known as one of the first globular clusters to contain a millisecond pulsar. 11 additional pulsars have since been found!
Image credit: www.skyledge.net -
Seen in binoculars, M28 is a hazy patch. It requires at least a 4" scope for the individual stars to start resolving.
Image credit: NASA/STScI/WikiSky -
Messier 28
How to find M28 in the night sky, some history on the discovery of M28 and talk about its pulsars -
Messier Monday: The Teapot-Dome Cluster, M28
History of M28, what types of stars it contains, video clip of x-ray pulsations -
Messier Object 28
Info on M28 from SEDS (Students for the Exploration and Development of Space) database including historical observations and descriptions and a link to a catalog of the variables.
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