Cetus

Cetus is one of the largest constellations, straddling the celestial equator. It is best known for Mira (Omicron Ceti), the prototype long-period variable star whose brightness varies dramatically over about 332 days. The constellation also contains Tau Ceti, a nearby Sun-like star.

Location in the Sky

When to Observe

Cetus is best observed during November. It is located in the SQ1 quadrant and is primarily visible from the both hemispheres. The constellation contains 14 main stars forming its asterism, with 45 Bayer/Flamsteed designated stars in total. Its brightest star is Diphda.

Mythology & History

In Greek mythology, Cetus was the sea monster sent by Poseidon to ravage the coast of Ethiopia as punishment for Queen Cassiopeia's vanity. The monster was slain by Perseus, who used the head of Medusa to turn it to stone and rescue Princess Andromeda. Cetus is sometimes depicted as a whale rather than a monster.