明天的流星雨。很想去看。一定要到很荒凉的地方才行。
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１８日狮子座流星雨光临地球
http://www.jmnews.com.cn 2006-11-16 15:50 新华社
新华社南京１１月１６日电（记者蔡玉高、周润健）一年一度的狮子座流星雨再次光临地球。江苏、天津两地天文学会通报，狮子座流星雨将于１８日４时５０分左右爆发，届时，每小时可能会有数十颗流星划过夜空，对包括我国在内的东亚地区的天文爱好者来说，是一次难得的观测流星雨的好机会。
狮子座流星雨的母体彗星为“坦普尔－塔特尔”彗星。当彗星飞临近日点时，由于太阳光的照射，使得彗星母体上冰物质升华，迸射出无数彗星尘粒或碎片。在地球与彗星轨道相交时，这些尘粒与地球大气层发生摩擦、燃烧，形成流星雨。
近年观测表明，狮子座流星雨迸发时常见特别明亮的火流星，这些流星在夜空中拖着长长的尾迹，非常美妙。尤其是２００１年狮子座流星雨曾出现每小时３０００多颗流星的壮观景象。
江苏省天文学会副秘书长严家荣介绍，１８日正值农历九月二十八，一轮残月基本上不会影响观测。天文爱好者应该选择在视野开阔、人烟稀少、灯光暗淡的地点，在晴朗的夜空里进行观测。最佳的观测时间为１７日晚到１８日凌晨，１７日太阳落山后，天文爱好者便可进行观测。天文爱好者观测流星雨一定要有耐心，在静候流星的同时也应该注意保暖和安全。
中科院紫金山天文台研究员王思潮提醒广大天文爱好者，由于目前人类还不能精确计算流星雨母体彗星尘粒的分布结构，因而不能像预报日食、月食那样，对流星雨的发生和规模作出准确预报。公众在观测时对此应有一定的心理准备。
Strong Leonid Meteor Shower Expected This Weekend
Robert Roy Britt
SPACE.com Tue Nov 14, 3:15 PM ET
The annual Leonid meteor shower could produce a strong outburst this weekend for residents of the North America and Western Europe.
A brief surge of activity is expected begin around 11:45 p.m. ET Saturday, Nov. 18. In Europe, that corresponds to early Sunday morning, Nov. 19 at 4:45 GMT. The outburst could last up to two hours.
At the peak, people in these favorable locations could see up to 150 shooting stars per hour, or more than two per minute.
"We expect an outburst of more than 100 Leonids per hour," said Bill Cooke, the head of NASA's Meteoroid Environment Office. Cooke notes that the shooting stars during this peak period are likely to be faint, however, created by very small meteoroid grains.
Elsewhere people will see the typically enjoyable Leonid display of a few meteors each hour, weather permitting and assuming dark skies away from city lights [Top 10 Leonids Facts].
Ancient debris
The Leonids are bits of debris left behind by repeated passages through the inner solar system of the comet Tempel-Tuttle. Each November, Earth crosses various trails of debris, which have spread out over centuries and millennia. Dense debris trails have caused incredible meteor storms in years, past, notably 1998 through 2002 [Images from 2001: Gallery 1, 2, 3, 4].
Since then the show has been back to normal. But recent computer modeling suggests a brief outburst.
"For parts of Europe, Africa and eastern North America, a far more prolific Leonid show could be in the offing this year," said Joe Rao, SPACE.com's Skywatching Columnist.
This year is not expected to be as memorable as some but well worth a look, astronomers say. The Leonids are known for producing bright fireballs, which could occur at any time.
The Leonids are so-named because they appear to emanate from Leo. The meteors can race across the sky in any direction, but trace each one back and it'll point to Leo.
Other opportunities
Unfortunately for viewer's on the U.S. West Coast, the peak occurs before Leo rises. Outside of the expected peak, the best time to watch for Leonids is in the pre-dawn hours, when the constellation Leo is high in the sky.
The Leonids are actually underway already, ramping up gradually to the peak. The event continues for several days after the peak. So any morning during this time could offer up a handful of meteors each hour. Other shooting stars from other sources typically grace the sky at low rates, too.
Flurries of enhanced activity can come at any time. Cooke suggests taking a look in the pre-dawn hours Friday, Saturday and Sunday. Up to 10 shooting stars per hour are possible any of these mornings.
How to watch
Precise prediction of meteor showers is an infant science, so those in position to observe the possible outburst should plan to head out a half-hour before the predicted peak, allowing eyes time to adjust to the dark, and stay out for up to a half hour after the expected peak.
No special equipment is needed. Telescopes and binoculars are of no use.
A lounge chair or blanket and warm clothes are all you need [meteor watching tips]. Find a dark location with a clear view of the Eastern horizon. Lie back, face East, and scan as much of the sky as you can . You never know exactly where a Leonid will appear.
http://www.space.com/scienceastronomy/top10_leonidsfacts.html
====
１８日狮子座流星雨光临地球
http://www.jmnews.com.cn 2006-11-16 15:50 新华社
新华社南京１１月１６日电（记者蔡玉高、周润健）一年一度的狮子座流星雨再次光临地球。江苏、天津两地天文学会通报，狮子座流星雨将于１８日４时５０分左右爆发，届时，每小时可能会有数十颗流星划过夜空，对包括我国在内的东亚地区的天文爱好者来说，是一次难得的观测流星雨的好机会。
狮子座流星雨的母体彗星为“坦普尔－塔特尔”彗星。当彗星飞临近日点时，由于太阳光的照射，使得彗星母体上冰物质升华，迸射出无数彗星尘粒或碎片。在地球与彗星轨道相交时，这些尘粒与地球大气层发生摩擦、燃烧，形成流星雨。
近年观测表明，狮子座流星雨迸发时常见特别明亮的火流星，这些流星在夜空中拖着长长的尾迹，非常美妙。尤其是２００１年狮子座流星雨曾出现每小时３０００多颗流星的壮观景象。
江苏省天文学会副秘书长严家荣介绍，１８日正值农历九月二十八，一轮残月基本上不会影响观测。天文爱好者应该选择在视野开阔、人烟稀少、灯光暗淡的地点，在晴朗的夜空里进行观测。最佳的观测时间为１７日晚到１８日凌晨，１７日太阳落山后，天文爱好者便可进行观测。天文爱好者观测流星雨一定要有耐心，在静候流星的同时也应该注意保暖和安全。
中科院紫金山天文台研究员王思潮提醒广大天文爱好者，由于目前人类还不能精确计算流星雨母体彗星尘粒的分布结构，因而不能像预报日食、月食那样，对流星雨的发生和规模作出准确预报。公众在观测时对此应有一定的心理准备。
Strong Leonid Meteor Shower Expected This Weekend
Robert Roy Britt
SPACE.com Tue Nov 14, 3:15 PM ET
The annual Leonid meteor shower could produce a strong outburst this weekend for residents of the North America and Western Europe.
A brief surge of activity is expected begin around 11:45 p.m. ET Saturday, Nov. 18. In Europe, that corresponds to early Sunday morning, Nov. 19 at 4:45 GMT. The outburst could last up to two hours.
At the peak, people in these favorable locations could see up to 150 shooting stars per hour, or more than two per minute.
"We expect an outburst of more than 100 Leonids per hour," said Bill Cooke, the head of NASA's Meteoroid Environment Office. Cooke notes that the shooting stars during this peak period are likely to be faint, however, created by very small meteoroid grains.
Elsewhere people will see the typically enjoyable Leonid display of a few meteors each hour, weather permitting and assuming dark skies away from city lights [Top 10 Leonids Facts].
Ancient debris
The Leonids are bits of debris left behind by repeated passages through the inner solar system of the comet Tempel-Tuttle. Each November, Earth crosses various trails of debris, which have spread out over centuries and millennia. Dense debris trails have caused incredible meteor storms in years, past, notably 1998 through 2002 [Images from 2001: Gallery 1, 2, 3, 4].
Since then the show has been back to normal. But recent computer modeling suggests a brief outburst.
"For parts of Europe, Africa and eastern North America, a far more prolific Leonid show could be in the offing this year," said Joe Rao, SPACE.com's Skywatching Columnist.
This year is not expected to be as memorable as some but well worth a look, astronomers say. The Leonids are known for producing bright fireballs, which could occur at any time.
The Leonids are so-named because they appear to emanate from Leo. The meteors can race across the sky in any direction, but trace each one back and it'll point to Leo.
Other opportunities
Unfortunately for viewer's on the U.S. West Coast, the peak occurs before Leo rises. Outside of the expected peak, the best time to watch for Leonids is in the pre-dawn hours, when the constellation Leo is high in the sky.
The Leonids are actually underway already, ramping up gradually to the peak. The event continues for several days after the peak. So any morning during this time could offer up a handful of meteors each hour. Other shooting stars from other sources typically grace the sky at low rates, too.
Flurries of enhanced activity can come at any time. Cooke suggests taking a look in the pre-dawn hours Friday, Saturday and Sunday. Up to 10 shooting stars per hour are possible any of these mornings.
How to watch
Precise prediction of meteor showers is an infant science, so those in position to observe the possible outburst should plan to head out a half-hour before the predicted peak, allowing eyes time to adjust to the dark, and stay out for up to a half hour after the expected peak.
No special equipment is needed. Telescopes and binoculars are of no use.
A lounge chair or blanket and warm clothes are all you need [meteor watching tips]. Find a dark location with a clear view of the Eastern horizon. Lie back, face East, and scan as much of the sky as you can . You never know exactly where a Leonid will appear.
http://www.space.com/scienceastronomy/top10_leonidsfacts.html
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