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Orionid Meteor Shower - 2020

Orionid Meteor Shower - 2020

The Orionid meteor shower will peak around mid-week, with the best morning likely being Wednesday, October 21. Try watching on the mornings of October 20 and 22, too. In 2020, the moon will be a waxing crescent at the shower’s peak. That means the moon will set in the evening hours, or before the constellation Orion – the radiant of the Orionid shower – rises in the east at late evening. The Orionids start producing meteors at late evening but the number of meteors increases after midnight. Typically, the greatest number of Orionid meteors streak the sky during the few hours before dawn. In a moonless sky, you can see as many as 10 to 15 meteors per hour at the Orionids’ peak.

When should you watch for Orionid meteors? Meteor showers aren’t just one-night events. The Orionid shower lasts from early October to early November, as Earth passes through a stream of debris left behind by a comet, in this case, the famous Comet Halley. According to the International Meteor Organization (IMO), the Orionids often exhibit several lesser maxima, so meteor activity may remain more or less constant for several nights in a row, centered on a peak night.

The Orionid meteors generally start at late night, or around midnight, and display maximum numbers in the predawn hours. That’s true no matter where you live on Earth, or what time zone you’re in. If you peer in a dark sky between midnight and dawn on October 20, 21 or 22, you’ll likely see some meteors flying.

The particles come from Comet 1P/Halley, better known as Halley's Comet. This famous comet swings by Earth every 75 to 76 years, and as the icy comet makes its way around the sun, it leaves behind a trail of comet crumbs. At certain times of the year, Earth's orbit around the sun crosses paths with the debris. 

"You can see pieces of Halley's Comet during the Eta Aquarids [in May] and the Orionid meteor shower [in October and November]," Cooke told Space.com. 

Orionid Meteor Shower: Leftovers of Halley's Comet

Typically, the Orionids produce about 20 meteors an hour, but in exceptional years, like 2006 and 2009, they've rivaled August's famous Perseid meteor shower. Cooke expects the shower to produce about 30 or 40 meteors an hour this year. The meteors radiate from the constellation Orion, but can be seen from anywhere in the sky.

The meteoroids from Halley’s Comet strike Earth’s atmosphere at a speed of 148,000mph, (238,000kph) incinerates in fiery flashes of light easily visible with the naked eye.

The Orionids are known for their speed and brilliance, meaning there’s a good chance this with enough patience should see several bright ‘shooting stars’ hurtling across the sky.

Halley’s Comet itself has not been visible from Earth since 1986.

How to view the show

Orionid meteors are visible from anywhere on Earth and can be seen anywhere across the sky. If you find the shape of Orion the Hunter, the meteor shower's radiant (or point of origin) will be near Orion's sword, slightly north of his left shoulder (the star Betelgeuse). But don't stare straight at this spot, Cooke said, "because meteors close to the radiant have short trails and are harder to see — so you want to look away from Orion." 

As is the case with most nighttime skywatching events, light pollution can hinder your view of the Orionid meteor shower (although this year, the moon will do damage as well). If possible, get far away from city lights, which can hinder the show. Go out around 1:30 a.m. and let your eyes adjust to the dark for about 20 minutes. Bundle up against the cold if necessary. Lie back and use only your eyes to watch the sky. Binoculars and telescopes won't improve the view, because they are designed to see more stationary objects in the sky

orionid radiant new f

Orionid meteors are visible from anywhere on Earth and can be seen anywhere across the sky. If you find the shape of Orion the Hunter, the meteor shower's radiant (or point of origin) will be near Orion's sword, slightly north of his left shoulder (the star Betelgeuse). But don't stare straight at this spot, "because meteors close to the radiant have short trails and are harder to see — so you want to look away from Orion." 

Some Orionids will appear very fast and bright, since they can whiz by at up to 148,000 mph (238,000 km/h) in relative speed. That's just six kilometers an hour slower than the Leonids, the speediest show of the year, Cooke said.

It's tempting to think that the brighter meteors represent fragments that would reach the ground, but Cooke said that isn't the case with the Orionids. These tiny comet fragments — some as small as a grain of sand — are called meteoroids. When they enter Earth's atmosphere, they become meteors. Friction from air resistance causes meteors to heat up, creating a bright, fiery trail commonly referred to as a shooting star. Most meteors disintegrate before making it to the ground. The few that do strike the Earth's surface are called meteorites.

halleys comet
An image of Halley's Comet taken in 1986. Credit: NASA

Cometary origins

Astronomers have recorded Halley's Comet as far back as 240 B.C. but no one realized that the same comet was making multiple appearances. In 1705, then-University of Oxford professor and astronomer Edmund Halley published "Synopsis Astronomia Cometicae" ("A Synopsis of the Astronomy of Comets"), which showed the first evidence that the comet is reoccurring. By studying the historical records of a comet that appeared in 1456, 1531, 1607 and 1682, Halley calculated that it was in fact the same comet and predicted it would reappear in 1758. While Halley died before the comet's return, it did appear on schedule and was named after him.

Reports of the Orionids, however, did not first appear until 1839 when an American in Connecticut spotted the shower, Cooke said. More observations of the shower were recorded during the Civil War between 1861 and 1865. Cooke told Space.com he wasn't sure why the meteor shower was discovered so late, given that records of Halley's Comet exist for millennia. 

The next perihelion (closet approach of Halley's Comet to the sun) is expected around July 2061. 

orionid meteor shower october 2015

Bottom line: The waxing crescent moon sets in the evening, providing dark skies for the 2020 Orionid meteor shower. Watch in the dark hours before dawn. Try watching on the mornings of October 20, 21 and 22. A dark sky is always best. Have fun!



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