Pisces Austrinus is a constellation located in the southern sky. It is known as the "Southern Fish" and is one of the 88 modern constellations recognized today. The brightest star in this constellation is Fomalhaut, which is one of the brightest stars visible from Earth. This constellation is best viewed during the months of October to December. Pisces Austrinus is relatively small and contains a few notable deep-sky objects, including the Fomalhaut planetary system, which has been studied for its potential exoplanets.