NAME: Eridanus (air-uh-DAHN-us)
CULMINATION: midnight, 10 November
GENITIVE: Eridani (air-uh-DAHN-ee)
NEIGHBORS: Cae, Cet, For, Hor, Hyi, Lep, Ori, Phe, Tau
BINOCULAR OBJECTS: none
URBAN OBJECTS: none
Eridanus is a dim, large, sprawling, southerly constellation, ranking 6th in size among the 88 constellations. It covers 1,138 square degrees of the celestial sphere, or about 2.8%. From its northern border on the celestial equator near Orion, Eridanus winds its way southwest, terminating near declination -57° at the 0th magnitude star Achernar, which means “the end of the river.” The southerly section of Eridanus, including Achernar, never rises above the southern horizon for observers at ...