MX Puppis (MX Pup) is a class B1.5IV (blue subgiant) star in the constellation Puppis. Its apparent magnitude varies irregularly between magnitude 4.6 and 4.9 and it is classified as a Gamma Cassiopeiae variable. It is approximately 930 light years away based on parallax.
MX Puppis was first found to be a variable star by Alan William James Cousins in 1959. It was given its variable star designation in 1972.
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