Ursid Meteor Shower
Earth is heading for a stream of comet dust that could produce a pleasing outburst of "shooting stars" this weekend (Dec 21-23). Forecasters say dozens of meteors per hour could emerge from a spot in the sky near the North Star (Polaris) when Earth encounters the dust on Saturday evening, Dec. 22nd. These meteors are called "Ursids" after Ursa Minor, the constellation where the North Star is located. If forecasting models are correct, the shower's peak will occur between 2100 and 2200 UT (4-5 pm EST) with meteors visible as much as four hours before and after that time.
The source of the dust is Comet 8P/Tuttle, which is traveling through the inner solar system this month and next. The comet itself can be seen through binoculars not far from the radiant of the shower. This gives sky watchers a rare opportunity to see a comet and its meteors in the same observing session.
Ursid meteors, which appear in small numbers annually, have a reputation for faintness and delicacy. Dark skies are usually required to see them; bright moonlight on Dec. 22nd will only exacerbate the problem of visibility. However, say forecasters, during an outburst of Ursids there may be a fair number of bright meteors. No one knows what will happen--all the more reason to look!
Unfortunately, though, a nearly full moon will drown out the fainter meteors.
For more information on the Ursids, see:
Next page: Green Comet Approaches Earth
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