Delphinus: A small constellation in the Northern Celestial Hemisphere, named after the Latin word for dolphin. It is one of the 48 constellations listed by Ptolemy and has five bright stars forming a distinctive asterism.
Mythology: Delphinus is associated with two Greek myths, one involving Poseidon and Amphitrite, and the other involving Arion and a dolphin. It also has meanings in other cultures, such as Chinese, Polynesian, and Hindu.
Stars: Delphinus has two stars above fourth magnitude, Sualocin and Rotanev, which are spectroscopic binaries. It also has Gamma Delphini, a celebrated binary star among amateur astronomers, and Epsilon Delphini, a variable star. Zeta Delphini has a brown dwarf companion, and 18 Delphini has an exoplanet named Arion.
Deep-sky objects: Delphinus is in a rich Milky Way star field and contains several planetary nebulae, such as NGC 6891 and NGC 6905, and globular clusters, such as NGC 6934 and NGC 7006.
Read about other constellations