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Strong Leonid Meteor Shower Expected Nov. 18


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14 replies to this topic

#1    Hazzard

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Posted 14 November 2006 - 10:15 AM

Quote

If you live in Western Europe or eastern North America, put a big circle on your calendar around Saturday, Nov. 18.  If that night is clear, bundle up warmly and head outside because you may be able to catch a glimpse of an intense, albeit brief display of Leonid meteors.......... Skywatchers in Western Europe will have ringside seats:  thumbsup.gif  


http://space.com/scienceastronomy/061017_leonids_2006.html

Edited by hazzard, 14 November 2006 - 10:15 AM.

I still await the compelling Exhibit A.

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#2    Homerduff

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Posted 14 November 2006 - 10:24 PM

Oh cool, though in Western Europe it will be around Nov. 19 at 4:45 GMT which makes it a lot harder for me to follow it..


#3    frogfish

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Posted 15 November 2006 - 12:01 AM

Actually, it should be just as string in the US, but at a much less convenient time.

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#4    SilverCougar

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Posted 15 November 2006 - 07:35 AM

damned =(  Guess living in the PNW means no can see...

well it'll probaly be cloudy and raining anyways.. *cries*

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#5    Roj47

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Posted 15 November 2006 - 09:52 AM

Quote


Oh cool, though in Western Europe it will be around Nov. 19 at 4:45 GMT which makes it a lot harder for me to follow it..


Not too bad.... I normally stagger in around 4am after a night out on Saturday, so not much longer to stay up..... just a few more beers original.gif

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#6    Lord Umbarger

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Posted 15 November 2006 - 11:15 AM

I always look forward to these things. I don't know why, but I do.

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#7    Waspie_Dwarf

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Posted 15 November 2006 - 11:46 AM

Return of the Leonids

Nov. 14 , 2006: On Sunday, Nov. 19th, Earth will pass through a stream of debris from comet 55P/Tempel-Tuttle. The result: a shower of Leonid meteors.

see caption"We expect an outburst of more than 100 Leonids per hour," says Bill Cooke, the head of NASA's Meteoroid Environment Office in Huntsville, AL. This pales in comparison to the Leonid storms of 2001 and 2002, when sky watchers saw thousands of meteors. Even so, a hundred per hour would make the Leonids one of the best showers of 2006.

IPB Image
Above: A Leonid meteor streaks past the Orion Nebula in 2001.
Photo Credit: Mark Brown of Alabama. [More]


The problem is, you have to be in the right place at the right time to see them.

Earth's encounter with the comet dust is going to be brief—"possibly no more than a few hours long," says Cooke. Forecasters differ on when the outburst will occur. Estimates range from 0445 UT to 0630 UT on Nov. 19th (11:45 p.m. on Nov. 18th to 1:30 am EST on Nov. 19th). The timing favors western Europe, Africa, Brazil and eastern parts of North America: map.

Cooke urges observers to find the darkest possible skies. "These Leonids are going to be faint." Why? "The stream contains very small grains of comet dust. Small grains make faint meteors--it's as simple as that."

The mid-November region of Earth's orbit is littered with debris from Comet Tempel-Tuttle. Every time the comet visits the inner solar system (once every 33 years), it lays down a new stream of dust, pebbles and rock. This creates a sort of "minefield" for Earth to navigate every November.

Not all of these debris streams are alike. For example: "A Leonid stream we hit in 1998 was full of rock-sized debris. They made brilliant fireballs when they hit the atmosphere," recalls Cooke. "The stream we're hitting this year is just the opposite. It's mostly fine dust."

IPB Image
Above: A minefield of Leonid debris streams. The streams
intersect the plot at nearly right angles, so they resemble
2D clouds rather than 3D filaments.
Credit J. Vaubaillon. [More]


Debris streams are segregated—dusty vs. rocky—by the force of sunlight. Consider the stream directly ahead of us: "It was ejected from the comet in 1933," says Cooke. "At first, the debris was a mixture of many sizes." But as years passed, the smaller particles diverged from the larger ones. Radiation pressure—the delicate pressure of sunlight itself—pushed the light dust onto a collision course with Earth. Heavier rock-sized fragments resisted the pressure and lagged behind.

Perhaps in some future year we'll encounter the larger debris from 1933 and receive an overdue display of fireballs. How would they get here? "Nudged by Jupiter," suggests Cooke. Jupiter's gravity is strong enough to alter the course of heavier fragments. Indeed, by guiding debris toward us, Jupiter is indirectly responsible for many bright Leonid displays in the past.

But this is 2006. So prepare for an outburst of faint Leonids.

Extra: Don't believe everything you read. While meteor forecasters have done a splendid job predicting Leonid outbursts in recent years—sometimes "nailing the peak within minutes"—they could be wrong in 2006. The outburst might happen at an unexpected time or it might be better than expected. Cooke urges enthusiasts everywhere to keep an eye out for Leonid meteors the nights of Nov. 17th – 19th. "The best time to look," he says, "is just before local dawn when the constellation Leo is high in the sky."

Author: Dr. Tony Phillips | Production Editor: Dr. Tony Phillips | Credit: Science@NASA


More to the story...
Leonid Forecasts: from David Asher of the Armagh Observatory; from Jeremie Vaubaillon of the Institut de Mécanique Céleste.

Where will the Leonids fall? According to forecasters David Asher (Armagh Observatory) and Rob McNaught (Australian National University), this side of Earth will have the best view:

IPB Image
Note: The hemisphere on the right is daylit. The hemisphere on the left is still in darkness.

Leonid Photo Gallery

The Vision for Space Exploration


Source: Science@NASA

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#8    Lilly

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Posted 18 November 2006 - 12:46 PM

Showing right now!

I caught some of this last night (was a bit cloudy in my area). However, clear weather is predicted this evening. Promises to be some pretty good viewing...enjoy!

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#9    Unlimited

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Posted 18 November 2006 - 01:25 PM

I always catch this one...im going to the woods to watch for UFO's as well...enjoy

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#10    Hazzard

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Posted 18 November 2006 - 04:15 PM

I just looked out the window, still overcast.  crying.gif

Edited by hazzard, 19 November 2006 - 04:25 PM.

I still await the compelling Exhibit A.

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#11    Waspie_Dwarf

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Posted 18 November 2006 - 10:57 PM

Topics merged - Waspie_Dwarf

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#12    frogfish

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Posted 19 November 2006 - 01:05 AM

It's cloudy here. Hopefully it will clear up...It's just my luck. Damn Michigan, it was cloudy during the great Leonid shower a few years ago.

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#13    Raptor

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Posted 19 November 2006 - 01:38 AM

Didn't have any idea it was already due. I'll try to keep an eye out, although it's been pretty overcast for hours now.


#14    bLu3 de 3n3rgy

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Posted 19 November 2006 - 01:56 AM

Takes a trip outside...ouch


I don't think I'll be able to see anything here tonight, the sky is cloudy and it's wintry showers sad.gif

Edited by Anvil, 19 November 2006 - 02:19 AM.

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#15    Purplos

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Posted 19 November 2006 - 02:27 AM

Cloudy here too sad.gif

I remember - probably the 2002 ones - or around then - floating in the pool in the backyard in the middle of the night and staring up at the fantastic show....

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