12月22日小熊座流星雨观测指导

12月22日小熊座流星雨观测指导
http://www.amsmeteors.org/showers.html#ursids

Viewing Activity from the 2009 Ursid Meteor Shower

                               
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This chart represents plotted Ursid meteors (arrows) seen from 40 degrees north latitude while facing north near 5:00am local standard time on in on December 22nd. This chart was created using SkyChart III Version 3.5.1 from Carina Software.
The Ursids is an obscure shower that is active for a week prior to Christmas. This shower is listed among the annual major showers as its ZHR (Zenith Hourly Rate) averages ten shower members per hour. Actual rates can be quite variable. I have seen years when it has reached 25 per hour and others when the shower is nearly non-existent. 2009 is a favorable year to try and view them as the waxing crescent moon will not interfere much with observations. The Ursids are particles shed from comet 8P/Tuttle. The Earth passes through the debris field of comet 8P Tuttle from December 17 through the 23rd. We are situated closest to the center of the comet's orbit on December 22nd; therefore the Ursids will be most active on this date. Particles from comet 8P/Tuttle strike the Earth at a perpendicular angle far above (north) the ecliptic. As seen from the Earth's surface these meteors will appear to shoot forth from an area of the sky (the radiant) located near the bowl of the "Little Dipper", also known as the constellation of Ursa Minor. The bright orange star Kochab (Beta Ursae Minoris) is a good guide to the Ursid radiant. Kochab is a circumpolar (never sets) star for all locations north of latitude 15 north. Therefore from this portion of the Earth, the radiant is in the sky all night long and Ursid activity may be seen at any time of night. For northern tropical areas the radiant is located low in the north during the evening hours. During the morning hours the radiant slowly rises and reaches the same altitude of nearby Polaris (Alpha Ursae Minoris) near 0300 local standard time. The best time to view Ursid activity from anywhere is during the last hour before dawn when the radiant lies highest above the horizon in a dark sky. Due to the high northern declination (celestial latitude), this shower is not visible to observers located south of the equator. Since the Ursids strike the Earth at a perpendicular angle they will appear to travel slower than the better known Perseids of August or Leonids of November. Entering the atmosphere at 33 kilometers per second, this shower has velocities comparable to the recent Geminid shower. Most of the Ursid meteors are faint therefore it is important to observe from rural areas away from city lights. Since the radiant lies in the northern half of the sky it would be best to face this general direction to see the most activity. There is no need to stare directly at the radiant, rather it is advised simply to place the radiant somewhere within your field of view so that it will to easy to trace which meteors line up with Kochab (Ursids) and those that don't (non-Ursids or sporadics). There are two other areas of minor activity active during the Ursids. The antihelion radiant lies in central Gemini and will produce 2-3 slow meteors per hour. While facing north these meteors would enter your field of view from the upper right during the evening hours, from above and behind you near midnight, and from the upper left during the morning hours. The December Leonis Minorid radiant will produce swift meteors from eastern Leo Minor that are only seen from the northeast during the morning hours. If viewing from dark skies one should also be able to count 10-15 sporadic (random) meteors per hour. If you would like to contribute more to our knowledge of the Ursids, 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 AMS. We accept data from observers with all levels of experience. Our data is published in our quarterly newsletter "Meteor Trails". Blank data forms are available for downloading at the visual section of this web site. The easiest way to share your data is to email your results to our visual coordinator Kim Youmans.

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GOOGLE翻译：本图是绘制（箭头）由北纬40度时所看到面临北临上午05时00分当地标准时间12月22日在Ursid流星。本图是使用从刘嘉玲软件SkyChart三版本3.5.1。
该Ursids是一个模糊的淋浴是一个星期前活跃圣诞节。淋浴间，这是作为其ZHR（每小时最高境界率）平均为每小时10淋浴成员一年一度的骤雨中列出。实际费率可以相当变数。我看到时，已达到每小时和其他淋浴时，25年几乎不存在。 2009年是一个有利的尝试，并认为是一痕新月他们不会干预意见很大。该Ursids粒子流是从彗星8P/Tuttle。地球经过12月17日通过的第23次通过8P的彗星碎片领域的塔特尔。我们位于最接近彗星的轨道围绕12月22日，因此将在Ursids此日期上最活跃的。从彗星8P/Tuttle颗粒罢工1垂直角度地球远远高于（北）的黄道。从地球表面看，这些流星雨将出现从一个拍摄天空范围规定（光芒四射）附近的“小斗”，也为小熊星座称为碗。明亮的橙色星Kochab（试用大熊座小熊）是一个很好的指南Ursid辐射。 Kochab是北极圈（永远套）所有地点北纬15北极星。所以从这个地球的一部分，该辐射在天空中一整个晚上，Ursid活动可能被视为在任何夜间。对于北方的辐射位于夜间在北部的热带地区低。在清晨的辐射慢慢上升，到达附近的北极星（小熊大熊座阿尔法）近0300地方标准时间同一高度。最好的时间以查看Ursid活动从任何地方在最后一个小时是在清晨的时候是最高的辐射高于在黑暗的天空视野。由于北部高偏角（天体纬度），这雨是不可见赤道以南设观察员。由于罢工在Ursids垂直角度地球，他们将出现旅游慢于更好地了解8月或11月的狮子座流星雨英仙座流星雨。进入大气层每秒33公里，这雨速度相比，最近的双子座淋浴。流星的Ursid微弱多数，因此，重要的是从农村观察远离城市灯光。由于在天空的最好面对这个大方向看到北半部最活动的辐射所在。没有必要盯着的辐射，而是建议只是在某个地方你的视野，使之容易追查到的流星雨的辐射线，直接与Kochab（Ursids）和那些不（非Ursids或sporadics）。有两个小活动活跃在其他领域Ursids。在antihelion辐射在于中央双子座，将产生2-3每小时流星缓慢。尽管面临着北方将进入这些流星从右上方您的视野，在晚上的时间，从上面你身后近午夜，从左上角在上午的时间。 12月莱奥尼斯Minorid会产生辐射，从东部小狮迅速只能从东北看到，在凌晨的流星。如果看一个从黑暗的天空也应该能够依靠零星10-15（随机）每小时流星。如果你想做出更大的贡献我们的Ursids知识，那么，我邀请您对流星雨观测严重和作出的活动，您证人每小时计数。其他更详细的项目包括估算的规模，速度，和每个流星的颜色。其他人也注意到是否有一个持续的培训后，流星已经消失。流星看可以是有趣和有用的科学努力。要科学地用您必须共享一个如医疗辅助队积极流星组织您的数据。我们接受的各种经验水平的观察数据。我们的数据，在我们的出版季刊“流星滑道”。数据的空白表格可在本网站的视频部分下载。最简单的方式来分享你的数据以电子邮件的结果，我们的视觉协调员金尤曼斯。

好像问题很多~~

北天+小流量+暗弱=放弃

无视所以不翻译

我们这目前天气形势还不错，辐射点也很高，所以在纠结中。。。

由于不是周末，大部队无法成行，寄希望于忽悠一位有车族同好开到郊外前半夜观测下。