2009年Lyrid流星雨

大概就是说天琴座流星雨活动从4.16-4.27，极大在22-22日，ZHR=15. 在21-24日每小时能有5个群内流星，在这之外的时间，流星群活动微弱，每小时只能产生1-2个群内流星 ....(.....以下约省略1000字....)...




This chart represents plotted Lyrid meteors (arrows) seen from 40 degrees north latitude while facing north near 0500 local daylight time on April 22nd. This chart was created using SkyChart III Version 3.5.1 from Carina Software. -------------------------------------------------------------------------------- The Lyrids are active from April 16 through the 27th. Peak rates for this shower occur on the 22nd and 23rd when rates can approach 15 Lyrids per hour. 5 per hour can appear on the 21st and 24th. Away from these four nights, the Lyrids are weak, only producing 1-2 each hour. At the time of maximum activity the Lyrid radiant is actually located in eastern Hercules, seven degrees southwest of the brilliant star Vega (Alpha Lyrae). This area of the sky lies below the horizon during the early evening hours. Therefore no Lyrid activity can be seen until the late evening hours. The radiant attains a decent elevation between midnight and 0100, depending on your latitude. It is best situated high in a dark sky just before the start of morning twilight. Your best rates will occur during the last dark hour before dawn. On the nights of maximum activity the moon will be a waning crescent phase and will rise just an hour or so before the start of morning twilight. Observers in the Southern Hemisphere will see very little Lyrid activity as the radiant will be located low in the northern sky. All Lyrid meteors will trace back to the radiant area in eastern Hercules. There will be other showers and random activity visible during this period so not all meteors will be members of the Lyrid shower. Lyrid meteors will appear to travel swiftly through the sky unless they are seen near the radiant or near the horizon. Lyrids seen there will move more slowly as they are moving towards you (if seen near the radiant) or away from you (if seen near the horizon). The Lyrids are particles from Comet Thatcher (C/1861 G1). This comet has an orbital period of 415 years and the last time it was a perihelion was back in 1861. This shower has produced several notable outbursts. These occurred in the years 1803, 1849, 1850, 1884, 1922, 1945, and 1982. The 1803 event seems to the strongest as rates exceeded 500 Lyrids per hour at maximum. The 1982 event was seen from eastern North America where rates were estimated near 100 per hour at maximum. I witnessed the final portions of this outburst as I drove out to dark sky site. At that time, Lyrid meteors were seen shooting upward from the northeastern horizon. Once I arrived at my site the outburst was over and very little activity was seen the remainder of the night. The next possible outburst for this shower is predicted to occur in 2040 and 2041. If you would like to contribute more to our knowledge of the Lyrids, then I invite you to get serious about meteor observing and to make an hourly count of the activity you witness. Other more detailed projects include the estimating the magnitude, velocity, and color of each meteor. Others also note whether there was a persistent train after the meteor has vanished. Meteor watching can be both fun and scientifically useful endeavor. To be scientifically useful you must share your data with an active meteor organization such as the the AMS. We accept data from observers with all levels of experience. The easiest way to send in observations is to email your data to our visual coordinator Kim Youmans. We look forward to hearing from you!

                               
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                                                                                              --         转自美国流星协会

                               
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LZ的图片不像流星，倒像是个彗星

这个流星也发绿光啊

那是一颗火流星 一位美国人恰巧拍到了它

我看这颗流星亮度有-10等了！

应该在-12等以上，对于火流星来讲，实际现场观看到的效果要比照片上的明亮的多。