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| All meteor trails point back to a spot in the sky astronomers call the radiant. For the Leonid meteor shower, this point lies near Leo the Lion's head. The radiant, however, drifts from night to night because Earth's position is changing as our planet orbits the Sun. // Astronomy: Roen Kelly |
Get ready for the Leonid meteor shower
This year’s show occurs under prime conditions November 17.
They’re back! After exceptional displays in recent years, the Leonid meteor shower will appear under dark skies in 2012. Yet no one knows for sure what the shower has in store for us. Estimates range from a few meteors up to dozens of meteors per hour at the peak.
Predicting meteor rates, particularly for the highly variable Leonid shower, is akin to estimating the number of snowflakes that will fall on an area of ground. You simply can’t know until it’s all over. And in the case of this event, you’ll know only if you’re outside observing.
The remarkable activity that observers witnessed during 1999 (a rain of fireballs [meteors bright enough to cast a shadow]) and 2000 (more than 1,000 meteors per hour for a brief period) came about because the shower’s parent comet, 55P/Tempel-Tuttle, had passed through the inner solar system in 1998.
This year, predictions are more modest, but spikes in activity can occur at any time. The shower’s peak occurs across North America before dawn November 17. The Moon reaches First Quarter on the 20th, so it will only interfere if you observe before moonset, around 10 p.m. local time. Even then, bright Leonids should shine through nicely.
Read more at Astronomy.com
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Links to Space and Science News
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