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11月18日凌晨别错过观赏流星雨的好时机!

 
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卜布



注册时间: 2009-08-31
帖子: 256

来自: 处处无家处处家

帖子发表于: 15-11-09 星期日 1:35 pm    发表主题: 11月18日凌晨别错过观赏流星雨的好时机! 引用并回复

流星雨18日划天际 齐来许千万心愿

二零零九年十一月七日 凌晨十二时四十一分


(槟岛西南区陈燕妮6日讯)有人说,看流星划过夜空,并默默向流星许个心愿……在所有的天象中,流星雨该是最浪漫、最迷人的了。根据天文学家预测,今年11月18日的狮子座流星雨可能会出现较大流量,甚至是“暴雨”级别,是市民观赏的好时机

据悉,狮子座流星雨在1998年和2001年的大规模爆发,让许多爱好者开始了流星雨的观测。

理科大学天文学会顾问张汉友博士表示,根据世界流星雨组织的预报,18日当天若天气好,在凌晨3时至清晨6时45分,朝东的放向望去,料将可看到狮子座流星雨。尤其是凌晨5时至6时,估计流星雨每小时可达120颗。
若在那时,出现1000颗至1500颗,就称为‘暴风雨’
。”不过,这仍会有变数。

他说,上一次理大天文学会在理大大规模看狮子座流星雨可追溯到1998年,离今已有超过10年。那时候,3000人聚在理大内,看到了125个火流星。每当火流星在夜空中闪过时,个个观测者都振臂欢呼。2001年,其中一名会员也在孟光水坝见到700颗流星雨。

他继说,届时只要天气晴朗,没月光的干扰,大家可在空旷的地方如大草场观看肉眼可见的狮子座流星雨。

12月份的双子座流星雨来袭

除了狮子座流星雨,张博士指出,12月份的双子座流星雨也是值得观测,该流星雨将从12月7日一直持续到17日,尤其是12月14日达到极盛,每小时流星数量最多可达到120颗左右

他说,双子座流星雨非常适合观测,不但流星的速度较慢,而且明亮的流星还会留下白色的余迹。
对于这次的双子座流星雨,他认为,从12月13日(星期日)晚上8时至14日清晨6时及14日(星期一)晚上8时至15日(星期二)清晨6时都是看流星雨的好时机。他说,相比与狮子座,双子座流星雨的观看时间比较长,约10个小时。

他还记得,理大师生及天文学会会员约30人就曾在2004年聚在浮罗班台亚齐天文台看双子座流星雨,一看就看了8个小时,从13日晚上至14日清晨,出现1103颗流星的壮观景象,对他而言,确实是最难忘的一刻。
如果那几个晚上的夜空是万里无云的,让我们看流星雨去吧!

流星雨小锦囊

互动百科资料显示,双子座流星雨与狮子座流星雨、英仙座流星雨,合称为“三大流星雨”,备受全球天文爱好者、流星雨迷的推崇。

狮子座流星雨

狮子座流星雨是由一颗叫做“坦普尔•塔特尔”(55P / Tempel-Tuttle)的彗星所抛撤的颗粒滑过大气层所形成的。在每年的11月10日至21日左右出现,平均每33至34年狮子座流星雨会出现一次高峰期,流星数目可超过每小时数千颗。

双子座流星雨

而双子座流星雨,它的流量非常稳定,极大值每小时可达120颗。由于流星雨辐射点位于黄道上的双子座内,它本身又有多个极大时间,且持续较长,因此全球绝大多数地区都有机会观测到它。同时也是唯一一个母体非彗星的流星雨,其母体是小行星3200法厄同(3200Phaethon)。与绝大多数流星雨最为壮观的场面都出现在凌晨的几个小时不同,双子座流星雨的“卖点”是等夜晚一到,爱好者就能看到双子座流星雨了。

http://www.kwongwah.com.my/news/2009/11/07/14.html


Picture:Click to zoom

狮子座流星雨。(取自网络照片)


Picture:Click to zoom

1998年狮子座火流星,非常壮观。(取自网络照片)


最后进行编辑的是 卜布 on 17-11-09 星期二 3:56 pm, 总计第 1 次编辑
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卜布



注册时间: 2009-08-31
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来自: 处处无家处处家

帖子发表于: 17-11-09 星期二 3:54 pm    发表主题: 引用并回复

Picture:Click to zoom

The 2009 peak of the Leonid meteor shower

13-11-2009 - ASTRONOMY ESSENTIALS

Everything you need to know about the possibility of a strong Leonid outburst in 2009.

The image at the top of this post shows Leonid meteors striking Earth’s atmosphere and creating “shooting stars” in our sky. The shower is happening now, day and night, as our world moves through space, crossing the orbital path of Comet Tempel-Tuttle, the parent comet of the Leonid meteor shower.
The Leonids are usually a modest shower, with typical rates of about 10 to 15 meteors per hour at the peak. But astronomers from Caltech and NASA last year predicted jointly that we may pass through a particularly dense clump of comet debris in 2009. That could mean a brief but strong outburst of meteors. One astronomer in particular, Jeremie Vaubaillon, predicts a theoretical maximum of 500 Leonid meteors for about an hour at the shower’s peak. Asia is favored, but North America might also see more meteors than usual. The reality is … no one can predict precisely.

The astronomers based their prediction on an outburst that took place during the 2008 Leonid meteor shower. In other words, as Comet Tempel-Tuttle orbits the sun, it leaves behind not just one stream of particles, but several streams. Last year, Earth passed through a meteor stream laid down by Tempel-Tuttle in the year 1466. Observers in Asia and Europe in 2008 counted as many as 100 meteors per hour, which led the astronomers to conclude that the 1466 stream is rich in meteor-producing debris.

This year, our planet will pass through the 1466 stream again, but this time we’ll pass more closely to the center of the stream. That central region of the meteor stream should be dense in bits of icy debris left behind by Tempel-Tuttle. Hence the prediction of a rich Leonid meteor outburst – for some – in 2009.

Just remember, these are predictions – not certainties.
Still, predictions are a meteor-watcher’s stock in trade. Plus the moon will be out of the way for this year’s Leonid meteor shower. New moon falls on Monday, November 16. Its absence from the night sky – plus the tantalizing possibility of 500 meteors per hour – will make 2009 an exceptionally favorable year for watching the Leonids.

(Leonid image at right: Ian Griffin)

When should I watch?

Knowing what time to watch is the tricky part this year. Typically, the best time to watch this meteor shower is between the hours of midnight and dawn.

But this year astronomers have predicted the peak of the shower – when we encounter the richest part of the 1466 meteor stream – for November 17, sometime around 22:00 to 23:00 Universal Time. That translates to late afternoon on November 17 (Tuesday) for us in the central U.S. We suggest watching in the hours between midnight and dawn on November 17. That’s your surest bet for seeing some meteors.

But what about the meteor ‘outburst’ of up to 500 meteors per hour? Will we see this outburst – if it materializes – in the Americas? Almost certainly not, if the outburst occurs at the predicted time. However, the Leonids are a notoriously capricious shower, and are certainly capable of defying the most carefully-crafted forecasts. The only way to know for sure if the Lion will whimper or roar – or somewhere in between – is to watch the shower from late night till dawn on November 16-17 and November 17-18. You’d hate to be indoors if there were something to see. Right? And with the new moon falling on November 16, we’re guaranteed of moon-free nights for watching this year’s shower.

So here’s our suggestion for the Leonid meteor shower of 2009, assuming you are in the Americas. First, as we said, try watching between midnight and dawn on November 17. Then – if you want to – step outside on the evening of November 17, in case meteors from the tail end of the outburst (if there is an outburst) are visible.

Where should I watch?

Although we hear lots of reports from people who see meteor showers from yards, decks, streets and especially highways in and around cities, the best place to watch a meteor shower is always in the country. Just go far enough from town that glittering stars, the same stars drowned by city lights, begin to pop into view.

City, state and national parks are often great places to watch meteor showers. Try googling the name of your state or city with ‘city park’ or ‘state park.’ Just be sure to go early in the day and find a wide open area with a good view of the sky in all directions.

Which direction should I look to see the Leonids?

Meteors in annual showers are named for the point in our sky from which they appear to radiate. This shower is named for the constellation Leo the Lion, because these meteors radiate outward from the vicinity of stars representing the Lion’s mane.

If you trace the paths of Leonid meteors backward on the sky’s dome, they do seem to stream from the constellation Leo. The point in the sky from which they appear to radiate is called the ‘radiant point.’ This radiant point is an optical illusion, though, no more real than standing on railroad tracks and peering off into the distance to see the tracks converge. The illusion of the radiant point is caused by the fact that the meteors – much like the railroad tracks – are moving on parallel paths.

In recent years, people have gotten the mistaken idea that you must know the whereabouts of a meteor shower’s radiant point in order to watch the meteor shower. You don’t need to. The meteors often don't become visible until they are 30 degrees or so from their radiant point. They are streaking out from the radiant in all directions. Thus the Leonid meteors – like meteors in all annual showers – will appear in all parts of the sky.

That's why – when watching a meteor shower – it's best simply to find a wide-open viewing area, lie back comfortably and watch as best you can in all parts of the sky. Sometimes friends like to watch together, facing different directions. When somebody sees one, they can call out.

Is this 2009 shower considered a meteor storm?

No. Not this year. Most astronomers say you need more than 1,000 meteors an hour to consider a shower as a storm. And no one is predicting that many meteors this year.

The Leonid shower is known for producing meteor storms, though. The parent comet – Tempel-Tuttle – completes a single orbit around the sun about once every 33 years. It releases fresh material every time it enters the inner solar system and approaches the sun. Since the 19th century, skywatchers have watched for Leonid meteor storms about every 33 years, beginning with the meteor storm of 1833, said to produce more than 100,000 meteors an hour. The next great Leonid storms were seen about 33 years later, in 1866 and 1867. A meteor storm was predicted for 1899, but did not materialize. It wasn’t until 1966 that the next spectacular Leonid storm was seen, this time over the Americas.

For me ?even one meteor can be a thrill. But we have become a world of thrill-seekers. If you want to watch this year’s possibly very rich Leonid meteor shower, just be sure to give it a chance. Find a dark sky location. Bring along a blanket or lawn chair and spend at least an hour watching. And enjoy!


http://news.earthsky.org/
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卜布



注册时间: 2009-08-31
帖子: 256

来自: 处处无家处处家

帖子发表于: 17-11-09 星期二 4:00 pm    发表主题: 引用并回复

狮子座流星雨今夜光临 江边是不错观测点

2009年11月17日 11:43

久以来,观看流星雨被当作一件很浪漫的事。由于流星数量之多和持续时间之长,狮子座流星雨被称作“流星雨之王” ,而今年的狮子座流星雨有可能是自2001年以来最壮观的一次,将出现在今晚到明天凌晨,“追星族”不可错过。

狮子座流星雨今夜光临18日凌晨达到顶峰

狮子座流星雨与今年8月的英仙座流星雨以及即将在12月份到来的双子座流星雨被称为“三大流星雨”,备受全球天文爱好者、流星雨迷的关注。狮子座流星雨曾于2001年爆发过一次,壮观景象令许多观测者至今难忘。

据桂林天爱有家天文爱好者俱乐部负责人贾鲁忠介绍,狮子座流星雨源于一颗叫坦普勒-塔特尔的彗星,有天文学家认为,今年的流星雨主要来源于这颗彗星在1466年和1533年所抛射出的物质团。

根据国际天文组织天体结构与星历计算协会IMCCE的预测,今年狮子座流星雨的最大流量约为每小时200颗,两个回归物分别产生的流量约为每小时115颗和每小时80颗,峰值预计会出现在18日北京时间凌晨5点50分前后,中国是最佳观测点之一。

“由于没有月光干扰,峰值出现时辐射点(流星雨来源处)已基本在头顶,而且这个过程就在晨曦之中,想必是一个难得的美丽画面。如果错过这次流星雨,可能要等到十年以后才有这么壮观的景象了。”贾鲁忠说,“不过由于流星雨是各种天象预报中最不准的一种预报,所以最终还要以观测到的结果为准。”

贾鲁忠介绍说,流星雨的产生源于彗星在太阳辐射及太阳风的影响下脱落的表面物质,这些物质在彗星轨道形成碎石继续围绕太阳旋转。当彗星轨道与地球轨道重叠时,我们就可以从地球上看到流星雨,而某些特定的流星雨每年都能看到。为了便于说明,天文学家们以流星雨的辐射点所在位置命名流星雨。由于今晚的流星雨辐射点在狮子座,因此被称为狮子座流星雨。

尧山顶和漓江边是不错的观测点

贾鲁忠说,观测流星雨应该选择灯光较少、视野宽阔的地方。“尧山顶或市区至阳朔段空旷黑暗的漓江边都是不错的选择。”观测时面向东方,可以用仰卧的姿势看到更广阔的天空。“外出观测时可以带上帐篷、电筒等用具,但是观测时不要打开电筒,否则会影响观测效果。”

流星雨的美丽虽是转瞬而逝,照相机却可以完美记录下整夜的流星活动。“由于这次流星雨的峰值在凌晨,晨光将会照亮地面山水的轮廓,这样就可以把美丽的桂林山水和流星雨结合在同一张照片中,这将是非常珍贵的。”

贾鲁忠提醒摄影爱好者们,要想拍摄流星雨,需要使用有手动B快门的相机。拍摄时要把辐射点放在中间,在保证照片质量的前提下尽量长时间曝光,曝光时间应当跨过整个峰值期。拍摄时也可以使用广角镜头,而三脚架则是长时间曝光保持稳定必不可少的工具。

夜间温度较低市民要注意保暖
记者从市气象局获悉,今晚到明天凌晨我市市区以阴天为主,大面积降雨的可能性不大,可能会有分散的小雨。由于天空中有云,因此有可能会影响观测流星雨。

气象局工作人员提醒市民,今晚夜间的气温将低至3摄氏度左右,外出观测流星雨的市民一定要带上大衣,注意防寒保暖。

http://news.gxnews.com.cn/staticpages/20091117/newgx4b021be9-2407582.shtml
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卜布



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来自: 处处无家处处家

帖子发表于: 17-11-09 星期二 4:10 pm    发表主题: 引用并回复

有人笑我一大把年纪了还像年轻小伙子般盼望观赏流星雨。

蓝天白云、绚丽晚霞、清丽彩虹、璀璨星空……皆让我着迷、兴奋不已!

我没看过流星雨……

不知今夜,应该是凌晨吧,我会否如愿以偿?

法情诸君,你们想不想看流星雨呢?
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卜布



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来自: 处处无家处处家

帖子发表于: 18-11-09 星期三 7:50 am    发表主题: 引用并回复

天不作美,下雨……

无缘观赏 Crying or Very sad

谁是幸运儿呢?是您吗?
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杨遥遥



注册时间: 2008-09-12
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来自: 天堂之州

帖子发表于: 18-11-09 星期三 12:17 pm    发表主题: 引用并回复

卜布 写到:
天不作美,下雨……

无缘观赏 Crying or Very sad

我这儿也是 hujan
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能为学生付出爱心就是老师的福气!
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*好小子



注册时间: 2009-03-20
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来自: 森美兰瓜拉庇劳Kuala Pilah, Negeri Sembilan

帖子发表于: 12-12-09 星期六 12:12 am    发表主题: 引用并回复

卜布 写到:
我没看过流星雨……

几年前的某个傍晚时刻,一颗青色的流星(或是彗星?)从IPSAH草场上空划过,虽然当时有很多人在场,但目击者只有我和另一位朋友。那一刻的我们,指着天空,哑口无言。难得的经验,呵呵。

我也和小周讲师一样期待流星雨!不知下次是几时。
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信心、毅力、勇气三者具备,则天下没有做不成的事。心不难,事就不难。
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