本帖最后由 948221078 于 2009-8-6 12:52 编辑
来源：International Meteor Organization
编译：贪星鬼
尽管是北半球较大流量的流星雨，可是今年的英仙座流星雨极大时刻的观测将被下弦月影响，它可能产生不只一个峰值，而且流量也有所增加。传统峰值出现在北京时间（下同）8月13日1：30—4：00（黄经140°0-140°1）。但是Esko Lyytinen认为我们在12日17：00前后会遭遇英仙座流星雨1610年尘埃带（黄经139°661），这有可能使得每小时天顶流量ZHR增加数十甚至超过一百，流星亮度可能符合正态分布或者更亮一些。他还强调在12日早些时候这个流星雨活动强度总体上会比通常常年份有所增大。另外在12日13：00前后（黄经139°499），地球将以0.003天文单位的距离通过一个19世纪的尘埃带，它可能造成ZHR的增加，但是小于10。最后，不管英仙座流星雨结果如何都要靠观测来证实。
国际流星组织原文：
Perseids: Although the major northern hemisphere Perseids are badly affected by the last quarter Moon near their best this year, there is the possibility they may produce more than one peak again, perhaps also with somewhat increased rates. The usual maximum is due around August 12, 17h30m-20h00m UT (λo = 140°0-140°1), but Esko Lyytinen suggests we may encounter the 1610 Perseid trail earlier on August 12, around 9h00m UT (λo = 139°661). This could produce activity additional to the normal Perseid ZHRs then of a few tens, maybe up to a hundred, probably with a fairly normal magnitude distribution, or perhaps marginally brighter. He further suggests that rates overall could be enhanced above usual by the relative proximity of the annual stream's core, most likely at other times on August 12 ahead of the normal peak. The 19th century trail should pass roughly 0.003 astronomical units inside the Earth's orbit at λo = 139°499, so around 5h UT on August 12, though it may add less than 10 to the ZHR at that point. Naturally, information to verify what takes place will be very valuable despite the Moon, so visual observers are encouraged to try to follow as much of what happens over the possible Perseid maxima as practical.
|
|
置顶卡
变色卡
千斤顶
显身卡
好帖 顶了~~~~~~
楼主
