The Southern Fish
Piscis Austrinus
Brightest star: Fomalhaut
Overview
Piscis Austrinus is a small constellation covering about 245 square degrees in the southern sky, but it punches well above its weight thanks to Fomalhaut (Alpha Piscis Austrini), which shines brilliantly at magnitude 1.2. Fomalhaut is the 18th-brightest star in the sky and one of the most isolated bright stars, sitting in a relatively barren region that makes it stand out dramatically. It lies about 25 light-years from Earth and is surrounded by a spectacular debris disk. Piscis Austrinus is one of the original 48 constellations recognized by Ptolemy and has been known since Babylonian times. It is best observed during October and November.
Mythology
In Babylonian tradition, Piscis Austrinus was associated with the fish-god Oannes, a being who emerged from the sea to teach humanity civilization, writing, and agriculture. The Greeks identified it as a great fish that drank the waters poured by Aquarius, with the constellation lying at the end of the water stream from the Water Bearer. In Egyptian mythology, this fish saved the life of the goddess Isis, earning its place among the stars. Some traditions consider Piscis Austrinus to be the parent of the two fishes of Pisces. Fomalhaut was one of the four Royal Stars of Persia, marking the winter solstice around 2500 BCE and serving as a guardian of the south.
Astrological Significance
Fomalhaut is one of the most important fixed stars in astrological tradition. As one of the four Royal Stars of ancient Persia (along with Aldebaran, Regulus, and Antares), it was known as Watcher of the South. In stellar astrology, Fomalhaut has a Venus-Mercury nature, associated with dreams, idealism, artistic talent, and fame, but also with the potential for disillusionment if ideals are not grounded in reality. The Southern Fish represents the depths of the unconscious and the source from which inspiration rises. Those with strong Fomalhaut connections in their birth charts may possess extraordinary creative or spiritual gifts.
Observing Tips
Piscis Austrinus is best observed during autumn evenings. Fomalhaut is unmistakable as the only bright star in a large, otherwise barren region of the southern sky, earning it the nickname the Lonely Star of Autumn. From mid-northern latitudes, it appears low on the southern horizon. Look south of the Great Square of Pegasus and below Aquarius. Fomalhaut's debris disk, imaged by the Hubble Space Telescope and informally dubbed the Eye of Sauron, is not visible in amateur instruments, but knowing it exists adds wonder to viewing this brilliant star. The rest of the constellation's stars are faint and form a small arc north of Fomalhaut.