The Keel. Carina was originally part of the large constellation, Argo Navis, a ship. The ship built by Jason and his Argonauts. The ship was then placed in the heavens by Athena. Later, when The International Astronomical Union defined the 88 constellations, they split Argo Navis into 4 parts: Carina (the keel), Vela (the sail), Puppis (the pup), and Pyxis (the compass).