An asteroid will eclipse the puzzling red star Betelgeuse on Dec. 11. Here’s how to see it

A rare astronomical event will be perfectly positioned in the night sky on Monday (Dec. 11) for some parts of the world.

On that evening, an asteroid will pass in front of the curious red star Betelgeuse, eclipsing it from our vantage point here on Earth and blocking it from view for up to 15 seconds in an event known as an occultation. The asteroid is known as 319 Leona, a main belt object that orbits the sun between Mars and Jupiter. Shaped roughly like an egg, 319 Leona measures some 50 by 34 miles (80 x 55 kilometers) in size.