Betelgeuse, one of the brightest stars in the sky, will vanish in a one-of-a-kind eclipse soon. Here's how to watch it.

One of the biggest and brightest stars in the night sky will momentarily vanish as an asteroid passes in front of it to produce a one-of-a-kind eclipse. The event should be visible to millions of people and it will also be livestreamed.

The rare and fleeting spectacle, late Monday into early Tuesday, will likely be visible to people along a narrow path stretching from central Asia's Tajikistan and Armenia, across Turkey, Greece, Italy and Spain, to Miami and the Florida Keys and finally, to parts of Mexico.

The star is Betelgeuse, a red supergiant in the constellation Orion. The asteroid is 319 Leona, a slowly rotating, oblong space rock in the main asteroid belt between Mars and Jupiter.