Latin:
“Keel”

Carina, constellation in the southern sky that stretches from about 7 to 11 hours right ascension and at about 60° south in declination. Its brightest star is Canopus, the second brightest star in the sky, with a magnitude of −0.7. Eta Carinae is a variable star that was even brighter than Canopus in the mid-19th century and is expected to become a supernova in the next several thousand years. This constellation was originally part of the much larger Argo Navis, which represented the ship Argo, in which Jason and the Argonauts sailed to retrieve the Golden Fleece. The French astronomer Nicolas Louis de Lacaille, in his Coelum Australe Stelliferum (“Star Catalog of the Southern Sky,” 1763), broke up Argo Navis into the smaller constellations of Carina, Puppis, and Vela.

Erik Gregersen

Crux

constellation
Also known as: The Southern Cross
Latin:
Cross
Also called:
the Southern Cross

Crux, constellation lying in the southern sky at about 12 hours 30 minutes right ascension and 60° south declination and visible only from south of about latitude 30° N (i.e., the latitude of North Africa and Florida). It appears on the flags of Australia, Brazil, New Zealand, Papua New Guinea, and Samoa.

French architect and cartographer Augustine Royer first described it as a constellation in a set of star maps published in 1679, but it has been written about since antiquity. The constellation has five bright stars, one badly placed from the viewpoint of symmetry, so the shape of the cross formed by the stars is somewhat irregular. Two of Crux’s stars, Alpha Crucis and Beta Crucis, are the 13th and 20th brightest stars in the sky, respectively, with magnitudes of 0.8 and 1.3. The constellation also contains the conspicuous molecular cloud called the Coalsack.

This article was most recently revised and updated by Erik Gregersen.