Betelgeuse the 10th. Aldebaran, Pollux, and Castor are also among the night's 25 brightest stars. The size of each star indicates its relative magnitude . Constellation names are light blue . Messier object numbers are pink .
Globular clusters are gold starbursts .
Open clusters are dotted white circles. Planetary nebula are green diamonds . Bright nebula are magenta squares . Dark nebula are grey rectangles . Green x's are x-ray sources.