The Dragon Constellation, also known as DRACO, is a large constellation located in the northern sky. It is one of the 48 constellations listed by the 2nd century astronomer Ptolemy and is the northernmost constellation in the sky. DRACO is visible throughout the year in most of the northern hemisphere and is home to several bright stars. It is also home to several deep sky objects, including the Cat's Eye Nebula and the Blinking Planetary Nebula.