Crux is the smallest constellation made up of 5 bright stars. Carina was once part of Argo Navis but is now divided into three parts and contains the second brightest star, Canopus. Centaurus is the 9th largest constellation composed of 11 stars including Alpha Centauri. The three largest constellations are Hydra, Virgo, and Ursa Major. The three smallest constellations are Crux, Equuleus, and Sagitta.