Friday, August 10, 2007

Perseid Weekend

The Perseids take place in mid-August, offering a striking contrast to the chilly nocturnal weather of November and December when the Leonids and Geminids take center stage.

The combination of nice conditions and picturesque meteors offer prime viewing pleasure.

The Perseids stand out because they occur at the time of warm summer nights and because they produce a consistent annual display of bright meteors.

The Perseids slowly have increased in number in recent weeks and are expected to peak overnight Saturday and Sunday with up to 60 "shooting stars" an hour.

While other showers might sporadically spawn higher numbers, the Perseids offer dependable yields of eye pleasures, often with persistent light trails that linger in the air.

The Perseids produce many bright blue-white meteors that usually catch the attention of people who are outside for reasons other than meteor watching.

The best time to watch the nightly exhibition is between 2 a.m. and dawn when the constellation Perseus, from where the shower seems to originate, is highest in the sky.

Can't wait up that late? The Perseids usually start appearing around 10 p.m. Some of the early ones streak more slowly, providing longer and more spectacular meteors.

People in the Northern Hemisphere have a good view of the Perseids, but because the constellation Perseus hardly rises above the horizon, their Southern Hemisphere counterparts have much less luck.

The Perseid meteors come from dust-size grains left behind by comet Swift-Tuttle, which every 130 years flies into the inner solar system. Most of the time the comet orbits beyond Pluto.

During August, the Earth moves into the comet debris trail, and the particles splat into the atmosphere, much like bugs hitting a windshield.

Rather than leaving behind a bloblike carcass, the Perseids disappear into a blaze of streaking light, incinerated by intense friction as they smack into the sky at speeds of about 37 miles per second (60 kilometers per second).

Bright lights are the bane of night sky watching; therefore, viewers should make sure to head to dark, open spaces far from cities for optimal viewing.

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