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Serpens
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Serpens

constellation
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Written by
Erik Gregersen
Erik Gregersen is a senior editor at Encyclopaedia Britannica, specializing in the physical sciences and technology. Before joining Britannica in 2007, he worked at the University of Chicago Press on the...
Erik Gregersen
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Latin:
“Serpent”
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Serpens, the only constellation divided into two parts, Serpens Caput (Latin: “Head of the Serpent”) and Serpens Cauda (Latin: “Tail of the Serpent”). The two parts represent the serpent held by the constellation of Ophiuchus. Serpens Caput is located at about 16 hours right ascension and 10° north in declination; Serpens Cauda is at about 18 hours right ascension and 10° south in declination. Its brightest star is Unukalhai (from the Arabic for “the serpent’s neck”), with a magnitude of 2.7.

Erik Gregersen