November’s wonderful Leonid meteor shower happens every year around November 17 or 18, as our world crosses the orbital path of Comet 55P/Tempel-Tuttle. Like many comets, Tempel-Tuttle litters its orbit with bits of debris. It’s when this cometary debris enters Earth’s atmosphere and vaporizes that we see the Leonid meteor shower. In 2018, the peak mornings of the shower are expected from midnight to dawn on Saturday, November 17, and Sunday, November 18. Although a bright waxing gibbous moon will be out for some of the night on the peak dates, try watching this shower during the predawn hours, or after the moon has set.
Click here to find out when the moon sets in your sky.
Although this shower is known for its periodic storms, no Leonid storm is expected this year. Keep reading to learn more.
How many Leonid meteors will you see in 2018? The answer, as always, depends on when you watch, and the clarity and darkness of your night sky. This shower has been known to produce meteor storms, but no Leonid storm is expected this year. The Leonids are usually a modest shower, with typical rates of about 10 to 15 meteors per hour at the peak, in the darkness before dawn. Your best bet is to watch between moonset and dawn.
Click here and check the astronomical twilight and moonrise and moonset boxes to find out when the moon sets and dawn begins.
When should you watch for Leonid meteors in 2018? Knowing what time to watch is easy. As with most meteor showers, the best time to watch the Leonids is usually between the hours of midnight and dawn. The expected peak morning is Saturday, November 17 or Sunday, November 18. That’s the mornings (not the evenings) of November 17 and 18.
Where should you watch the meteor shower? We hear lots of reports from people who see meteors from yards, decks, streets and especially highways in and around cities. But the best place to watch a meteor shower is always in the country. Just go far enough from town that glittering stars, the same stars drowned by city lights, begin to pop into view.
Find a place to watch – or recommend a place – at EarthSky’s Best Places to Stargaze page. Zoom out to see dark places worldwide.
City, state and national parks are often great places to watch meteor showers. Try Googling the name of your state or city with the words city park, state park or national park. Then, be sure to go to the park early in the day and find a wide open area with a good view of the sky in all directions.
When night falls, you’ll probably be impatient to see meteors. But remember that the shower is best after midnight. Catch a nap in early evening if you can. After midnight, lie back comfortably and watch as best you can in all parts of the sky.
Sometimes friends like to watch together, facing different directions. When somebody sees one, they can call out meteor! Then everyone can quickly turn to get a glimpse.
Which direction should I look to see the Leonids? Meteors in annual showers are named for the point in our sky from which they appear to radiate. This shower is named for the constellation Leo the Lion, because these meteors radiate outward from the vicinity of stars representing the Lion’s Mane.
If you trace the paths of Leonid meteors backward on the sky’s dome, they do seem to stream from near the star Algieba in the constellation Leo. The point in the sky from which they appear to radiate is called the radiant point. This radiant point is an optical illusion. It’s like standing on railroad tracks and peering off into the distance to see the tracks converge. The illusion of the radiant point is caused by the fact that the meteors – much like the railroad tracks – are moving on parallel paths.
In recent years, people have gotten the mistaken idea that you must know the whereabouts of a meteor shower’s radiant point in order to watch the meteor shower. You don’t need to. The meteors often don’t become visible until they are 30 degrees or so from their radiant point. They are streaking out from the radiant in all directions.
Thus the Leonid meteors – like meteors in all annual showers – will appear in all parts of the sky.
Will the Leonids produce a meteor storm in 2018? No. Not this year. Most astronomers say you need more than 1,000 meteors an hour to consider a shower as a storm. That’s a far cry from the 10 to 15 meteors per hour predicted for this year. Still, seeing even one bright meteor can make your night.
The Leonid shower is known for producing meteor storms, though. The parent comet – Tempel-Tuttle – completes a single orbit around the sun about once every 33 years. It releases fresh material every time it enters the inner solar system and approaches the sun. Since the 19th century, skywatchers have watched for Leonid meteor storms about every 33 years, beginning with the meteor storm of 1833, said to produce more than 100,000 meteors an hour.
The next great Leonid storms were seen about 33 years later, in 1866 and 1867.
Then a meteor storm was predicted for 1899, but did not materialize.
It wasn’t until 1966 that the next spectacular Leonid storm was seen, this time over the Americas. In 1966, observers in the southwest United States reported seeing 40 to 50 meteors per second (that’s 2,400 to 3,000 meteors per minute!) during a span of 15 minutes on the morning of November 17, 1966.
In 2001, another great Leonid meteor storm occurred. Spaceweather.com reported:
The display began on Sunday morning, November 18, when Earth glided into a dust cloud shed by Comet Tempel-Tuttle in 1766. Thousands of meteors per hour rained over North America and Hawaii. Then, on Monday morning November 19 (local time in Asia), it happened again: Earth entered a second cometary debris cloud from Tempel-Tuttle. Thousands more Leonids then fell over east Asian countries and Australia.
Bottom line: If you want to watch the 2018 Leonid meteor shower, just know that the predawn hours are best for meteor watching. The greatest numbers of meteors usually fall in the dark hours before dawn.
Deborah Byrd created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. Today, she serves as Editor-in-Chief of this website. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named 3505 Byrd in her honor. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. "Being an EarthSky editor is like hosting a big global party for cool nature-lovers," she says.