Perseids: How to watch the best meteor shower of the year

Perseid Meteor Shower

Credit: NASA/Bill Ingalls

Heading out to cottage country or camping? Be sure to look for the Perseids, one of the most impressive annual meteor showers of the year!

How to watch the Perseids

The Perseids can be seen from the northern hemisphere each year, from late July to mid-August. An increasing number of shooting stars should be visible every night, until the light show culminates on the nights of August 12 and 13.

During the peak, typically in the darkest hours after midnight, up to 50 to 80 meteors per hour can streak across the sky. To be even more specific, look up at the sky between moonset and dawn to see the most meteors of the night.

To fully enjoy the spectacle, here are a few tips for meteor hunting:

You can find more tips on sky observation in the section getting started in astronomy.

Perseids below!

Perseids below! Astronaut Ron Garan snapped this shot of a Perseid meteor (the white streak) below the International Space Station (ISS) on August 13, 2011. (Credit: Ron Garnan/NASA)

What causes the Perseids

Comet 109P/Swift–Tuttle causes this remarkable phenomenon. It orbits the sun, leaving a trail of dust and gravel in its path. Every summer, the Earth crosses the comet's orbital path and passes through its trail of debris. That debris becomes meteors as it disintegrates in our atmosphere and generates impressive flashes of light!

This image explains the difference between a comet, a meteor, a meteorite and a fireball.

From Comet to Meteorite! - Illustration

Comet, meteor or meteorite? Illustration providing an overview of the characteristics of comets, asteroids, meteoroids, meteors, fireballs and meteorites. (Credit: Canadian Space Agency)

Text version - Comet, meteor or meteorite? Illustration

Perseus: The legend behind the stars

The Perseids take their name from the constellation Perseus because they appear to fall right from it. Right before dawn, when we see the most meteors, Perseus is at its highest point in the sky. The constellation was catalogued by the Greek astronomer Ptolemy and named after the Greek mythological hero Perseus.

The constellation Perseus

Illustration of the constellation Perseus and surrounding constellations. (Credit: Chaouki on Flickr)

According to the legend, Perseus's most famous feat was defeating Medusa, the Gorgon sister with snakes instead of hair. Medusa would turn anyone who gazed at her into stone, and Perseus defeated her by using a reflective shield to turn her power against her. That is why Perseus is often represented holding her head. The star Algol, or demon star, in the constellation Perseus actually represents Medusa's head.

According to the myth, Perseus also married the princess Andromeda. They forever rest next to each other in the sky, as two constellations. You can find them in the sky close to the constellation Cassiopeia, Andromeda's mother in the myth, a fairly easy constellation to find because of its W shape.

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