Posted by Erin Jordan - email
TUCSON, AZ (NASA) - This year's Leonid meteor shower peaks tonight and right into Tuesday morning.
If forecasters are correct, the shower should produce a mild but pretty sprinkling of meteors over North America followed by a more intense outburst over Asia.
The phase of the Moon will be new, setting the stage for what could be one of the best Leonid showers in years.
"We're predicting 20 to 30 meteors per hour over the Americas, and as many as 200 to 300 per hour over Asia," says Bill Cooke of NASA's Meteoroid Environment Office. "Our forecast is in good accord with independent theoretical work by other astronomers."
Leonids are bits of debris from Comet Tempel-Tuttle.
Every 33 years the comet visits the inner solar system and leaves a stream of dusty debris in its wake.
Many of these streams have drifted across the November portion of Earth's orbit.
Whenever we hit one, meteors come flying out of the constellation Leo.
"We can predict when Earth will cross a debris stream with pretty good accuracy," says Cooke. "The intensity of the display is less certain, though, because we don't know how much debris is in each stream."
The debris is a diffuse mix of particles from several old streams that should produce a gentle display of two to three dozen meteors per hour over North America.
Dark skies are recommended for full effect. (Get out of the city if possible!)
"A remarkable feature of this year's shower is that Leonids will appear to be shooting almost directly out of the planet Mars," notes Cooke.
It's just a coincidence.
This year, Mars happens to be passing by the Leonid radiant at the time of the shower.
The Red Planet is almost twice as bright as a first magnitude star, so it makes an eye-catching companion for the Leonids: sky map.
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