Strong Meteor Shower Predicted Tonight

The annual Perseid meteor shower is expected to put on a good show this week for those willing to get up in the wee hours of the morning and wait patiently for the shooting stars.

The Perseids are always reliable, and sometimes rather spectacular. The only things that puts a damper on the August show are bad weather or bright moonlight. Unfortunately this week, as the Perseids reach their peak Tuesday and Wednesday nights, the moon will be high in the sky, outshining the fainter meteors.

Still, skywatchers around the globe will have a good chance of spotting the brighter meteors. The Perseids are bits of debris from Comet Swift-Tuttle, which has laid down several streams of debris, each in a slightly different location, over the centuries as it orbits the sun. Every August, Earth passes through these debris streams, which spread out over time.
"They are typically fast, bright and occasionally leave persistent trains," says Joe Rao, SPACE.com's Skywatching Columnist. "And every once in a while, a Perseid fireball will blaze forth, bright enough to be quite spectacular and more than capable to attract attention even in bright moonlight."

Low numbers of Perseids, including some dazzling fireballs have already been reported as Earth began entering the stream in late July. Seasoned observers have counted up to 25 per hour already, or nearly one every two minutes.

Astronomers expect up to 200 meteors per hour in short bursts of up to 15 minutes or so. But many of the fainter meteors will simply not be visible due to moonlight, and rates will go down even more for those in urban areas. More likely a typical observer under reasonably dark skies might hope to see a meteor every couple minutes when the bursts come, and fewer during lulls.

Meteor forecasting is still in its infancy, however, so the best bet for anyone truly hungry to spot shooting stars is to get in as much observing time as possible from around 11 p.m. Tuesday night until dawn Wednesday, and if you miss that show, try the same time frame Wednesday evening into Thursday morning.
Avid meteor watchers might want to try scanning the northeastern horizon from 9 p.m. to 11 p.m. local time (your local time, wherever you are) Tuesday and Wednesday for Perseids that graze the horizon.

Cooke points out that these earthgrazers, as they are called, are rare but remarkable.
"Earthgrazers are meteors that approach from the horizon and skim the atmosphere overhead like a stone skipping across the surface of a pond," Cooke explained. "They are long, slow and colorful – among the most beautiful.”
Read more at www.space.com