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Astronomers have discovered a new source of meteor showers, very likely from a comet, that may be coming to an Earth near you. While explaining why we shouldn’t panic at the news, Dr. Phil Plait gives us a great analogy for understanding meteor showers.
If the path of the comet intersects the orbit of the Earth, we plow through that material at the same time every year. Think of it this way: imagine a racetrack, and you are driving around it. Now also imagine a long line of gnats flying across the racetrack. You would drive through that line of bugs at the same point on the racetrack every time, right? OK, replace you with the Earth, the racetrack with the Earth’s orbit, and the bugs with debris shed off a comet. Since the Earth returns to the same point in its orbit every year, if there is cometary debris there, we’ll smack into it at roughly the same calendar day every year.
This loose stuff from the comet burns up in our atmosphere, and we get a meteor shower.
Find out more about the specific new information from the Cameras for Allsky Meteor Surveillance, or CAMS. at Bad Astronomy Blog. Link
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Tonight’s event is predicted to be “strong” with a couple dozen meteors per hour visible in the United States, several hundred per hour in Asia. This pales in comparison to some historic Leonid displays -
The meteor storm of 1833 was of truly superlative strength. One estimate is over one hundred thousand meteors an hour, but another, done as the storm abated, estimated in excess of two hundred thousand meteors an hour over the entire region of North America east of the Rocky Mountains.
One favorable factor tonight is that the moon is in its new phase, allowing better detection of the fainter meteors. The best viewing will occur between 1 a.m. and daybreak.
