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Eridanus

The River Eridanus

Equatorial Constellation

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Genitive	Eridani
Abbreviation	Eri
Constellation Family	Heavenly Waters
Celestial Quadrant	Primarily SQ1, extending fractionally into NQ1
Right Ascension	1h25m to 5h12m
Declination	-57.7° to +0.5°
Area (sq deg)	1,138
Brightest Star	Achernar
Optimum Visibility	November / December
Notes	Eridanus is one of the largest constellations by area, ranked sixth of the eighty-eight official star-groups. It extends southwards from the Celestial Equator for nearly sixty degrees, and its southern end is marked by blue Achernar, the tenth brightest star in the skies of Earth.

Map of Eridanus

Map of Eridanus

Both the Greeks and the Arabs saw this group of stars as a long river running southward across the sky. At its southern tip lies the bright star Achernar, 'River's End'.

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