Late Night Showers

The Leonid meteors are debris shed into space by Comet Tempel-Tuttle, which swings through the inner solar system at intervals of 33.25 years, looping around the sun then heading back into the outskirts of the solar system. With each visit the comet leaves behind a trail of dust in its wake.

This year, the Leonids — set to peak early Tuesday morning, Nov. 17 — should offer a better-than-average display.

Plenty of the comet's old dusty trails litter the mid-November part of Earth's orbit and the Earth glides through this debris zone every year. But predicting exactly what's out there is tricky.

The comet has since receded out to some 1.8 billion miles from the sun, having taken most of those dense filaments of dust with it. That's why this year, during the predawn hours of Nov. 17, when the Leonids traditionally should be at their most numerous, we now expect to see no more than 10 meteors per hour, even with the promise of this year's excellent viewing conditions thanks to a New moon.

North Americans – especially those living near and along the Atlantic Seaboard – will be able to watch for Leonids from after 1 a.m. local time right on until the first light of dawn, which comes soon after 5 a.m. local time.

Those in the eastern U.S. and Canada are especially favored because Leo will be high in the southeast sky between 3:30 and 5:30 a.m. EST, just before Earth is expected to exit the meteor cloud. For the West Coast, this translates to 12:30 to 2:30 a.m. PST, when Leo is much lower down in the eastern sky.