Piscis Austrinus (also known as
Piscis Australis) is a
constellation in the southern
celestial hemisphere. The name is
Latin for "the southern fish", in contrast with the larger constellation
Pisces, which represents a pair of fishes. Prior to the 20th century, it was also known as
Piscis Notius. Its only
star brighter than 4th
magnitude is
Fomalhaut, which is a first-magnitude star and is the 18th brightest star in the night sky.