Canis Major
Canis Major, Latin for 'Greater Dog,' is a prominent constellation in the southern sky. It is home to Sirius, the brightest star visible from Earth, and contains several notable deep-sky objects, including the emission nebula NGC 2359, also known as Thor's Helmet.
Source: science.nasa.gov
APODs including "Canis Major"
The Winter Hexagon
06/11/2002
Some of the brightest stars form a large and easily found pattern in the winter sky of Earth's northern hemisphere. Dubbed the Winter Hexagon, the stars involved can usually be identified even in the bright night skies of a big city. The six stars that compose the Winter Hexagon are Aldebaren, Capella, Castor, Procyon, Rigel, and Sirius. Rolling your cursor over the above image will identify them. The Winter Hexagon asterism engulfs several constellations including Orion and Canis Major.