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 rare and fleeting spectacle, late Monday into early Tuesday, should be visible to millions of 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 AP reports. The star is Betelgeuse, a red supergiant in the constellation Orion more than 700 times bigger than our sun. The asteroid is Leona, a slowly rotating, oblong space rock in the main asteroid belt between Mars and Jupiter.
Astronomers hope to learn more about Betelgeuse and Leona through the eclipse, which is expected to last no more than 15 seconds. By observing an eclipse of a much dimmer star by Leona in September, a Spanish-led team recently estimated the asteroid to be about 34 miles wide and 50 miles long. There are lingering uncertainties over those predictions as well as the size of the star and its expansive atmosphere. It's unclear if the asteroid will obscure the entire star, producing a total eclipse. Rather, the result could be a "ring of fire" eclipse with a miniscule blazing border around the star. If it's a total eclipse, astronomers aren't sure how many seconds the star will disappear completely, perhaps up to 10 seconds.
"Which scenario we will see is uncertain, making the event even more intriguing," said astronomer Gianluca Masa, founder of the Virtual Telescope Project, which will provide a live webcast from Italy. The eclipse is expected around 8:17pm Eastern, per Sky & Telescope. An estimated 700 light-years away and thousands of times brighter than our sun, Betelgeuse is visible with the naked eye. Binoculars and small telescopes will enhance the view. Sky & Telescope reports that an eclipse of a first-magnitude star—the brightest stars in the sky under a scale introduced by Hipparchus in the first century BC—is only visible from Earth once every few decades.
(More
astronomy stories.)
,
uBlock 
,
and
Ghostery 
)
