Mercury to streak across sun Monday in once in a blue moon event
CAPE CANAVERAL, Fla. — Mercury is putting on a rare celestial show this week, parading across the sun in view of most of the world.
The solar system’s smallest, innermost planet will resemble a tiny black dot Monday as it passes between Earth and the sun. It begins at 7:35 a.m. EST.
The 51⁄2-hour event will be visible, weather permitting, in the eastern U.S. and
Canada, and all Central and South America. The rest of North America, Europe and Africa will catch part of the action. Asia and Australia will miss out.
Unlike its 2016 transit, Mercury will pass practically dead center in front of our star.
Mercury’s next transit isn’t until 2032, and North America won’t get another viewing opportunity until 2049. Earthlings get treated to just 13 or 14 Mercury transits a century.
You’ll need proper eye protection for Monday’s spectacle: Telescopes or binoculars with solar filters are recommended. There’s no harm in pulling out the eclipse glasses from the total solar eclipse across the U.S. two years ago, but it would take “exceptional vision” to spot minuscule Mercury, said NASA solar astrophysicist Alex Young.
Mercury is 3,000 miles in diameter, compared with the sun’s 864,000 miles.
During its 2012 transit of the sun, larger and closer Venus was barely detectable by Young with his solarviewing glasses.
“That’s really close to the limit of what you can see,” he said last week. “So Mercury’s going to probably be too small.”
Venus transits are much rarer. The next one isn’t until 2117.
Mercury will cut a diagonal path left to right across the sun Monday, entering at bottom left and exiting top right. Although the trek will appear slow, Mercury will zoom across the sun at roughly 150,000 mph.
In a composite image provided by NASA, the planet Mercury will cut a diagonal path left to right across the sun.