Meteor Activity Outlook for January 24-30, 2009流星活动展望

January sees a peak of sporadic activity for the southern hemisphere while rates seen north of the equator begin a steady downward turn that continues throughout the first half of the year. The sporadic activity is good for both hemispheres, but not as good as it was for northern observers in December. Once the Quadrantids have passed the shower activity for January is very quiet. 一月对北半球一个有记录的偶发性的活动最高峰开始一个稳定的下降并将继续贯穿上半年。 这个偶发性的活动有益于两个半球观测，但是在十二月它不利于北半球的观测者。 一旦象限仪座流星雨过去，流星雨的活动在一月就很平静了。 During this period the moon reaches it new phase on Monday January 26th. At this time the moon lies in the vicinity of the sun and is invisible at night. Late next week the waxing crescent moon appears in the evening sky but sets soon after the end of twilight. Thus there is no lunar interference during this period. The estimated total hourly rates for evening observers this week is near two no matter your location. For morning observers the estimated total hourly rates should be near ten for those located in the mid-northern hemisphere (45 N) and twelve for those viewing from the mid-southern hemisphere (45 S). Locations between these two extremes would see activity between the listed figures. These rates assume that you are watching from rural areas away from all sources of light pollution. The actual rates will also depend on factors such as personal light and motion perception, local weather conditions, alertness and experience in watching meteor activity. 在1月26日之前新月到来这段时间里，月亮在太阳附近晚上是不容易看到的。 这最后一个星期残月出现在夜晚的天空，但却是在黎明快要结束的时候。 从而在这段时间没有月光的干扰。这估计每小时比率对晚上的观测者这个星期接近2， 不管你在哪里。对早晨的观测者每小时比率应该接近10对于南北半球中纬度。 在两个极端的将看到活动介于列出的表格。 这假定你在远离灯光污染的农村区域观测，在观测流星时候的实际结果也将受个人的照明亮度， 视力好坏，当地天气条件，敏锐程度和个人经验的影响。 The radiant positions and rates listed below are exact for Saturday night/Sunday morning January 24/25. These positions do not change greatly day to day so the listed coordinates may be used during this entire period. Most star atlases (available at science stores and planetariums) will provide maps with grid lines of the celestial coordinates so that you may find out exactly where these positions are located in the sky. A planisphere or computer planetarium program is also useful in showing the sky at any time of night on any date of the year. Activity from each radiant is best seen when it is positioned highest in the sky, either due north or south along the meridian, depending on your latitude. It must be remembered that meteor activity is rarely seen at the radiant position. Rather they shoot outwards from the radiant so it is best to center your field of view so that the radiant lies at the edge and not the center. Viewing there will allow you to easily trace the path of each meteor back to the radiant (if it is a shower member) or in another direction if it is a sporadic. Meteor activity is not seen from radiants that are located below the horizon. The positions below are listed in a west to east manner in order of right ascension (celestial longitude). The positions listed first are located further west therefore are accessible earlier in the night while those listed further down the list rise later in the night. 以下所列的是一月24/25星期六晚星期天早上的辐射点和流量数据。这些位置每天都不会有太大的变化，所以所列的相关数据适用于整个周期。 在天文馆或者是科技商店所得到的大多数星图都标有天空的网格线，所以可以精确地找到在天空中对应的位置。 星座图或者计算机星空软件也可以用来展示某年某月某日的夜空。最好的观测时机是辐射点最高的时候，沿子午线向南和向北的方向（根据你所处的纬度而定）。 要记住辐射点处流星很少。流星是从辐射点向外辐射的，所以最好将你的观测集中在辐射的周边而不是中心。 观测那儿，如果是流星雨，可以很容易地沿每颗流星的路径回溯到辐射点，如果是单个流星，则只能知道辐射点的方向。 辐射点位于地平线之下的流星观测不到。按赤经从西到东，越往西的位置将在夜里较早的时间升起，其后的升起的时间较晚。 The following showers are expected to be active this week: The wide Antihelion (ANT) radiant is now centered at 09:12 (138) +15. This area of the sky lies on the Leo/Cancer border, twelve degrees northwest of the first magnitude Regulus (Alpha Leonis). This radiant is best placed near 0100 LST, when it lies on the meridian and is located highest in the sky. Due to the large size of this radiant, any meteor radiating from Cancer or western Leo could be a candidate for this shower. Rates at this time should be near three per hour as seen from the northern hemisphere and two per hour for observers located south of the equator. With an entry velocity of 30 km/sec., the average Antihelion meteor would be of medium-slow speed. Later next week the Alpha Centaurids (ACE) become active from a radiant located at 12:56 (194) -55. This area of the sky is located in southern Centaurus, six degrees southeast of the second magnitude star Gamma Centauri. Current rates would be less than one shower member per hour. These meteors are best seen near 0500 local standard time when the radiant lies highest above the horizon. This shower is not visible north of 35 degrees north latitude and also poorly seen in the northern tropics. The southern hemisphere offers a much better view of this activity as the radiant lies much higher in the southern sky. Those located at high southern latitudes will actually encounter morning twilight before the radiant reaches culmination. At 56 km/sec. the Alpha Centaurids will usually produce meteors of swift velocity. The last remnants of the Coma Berenicids (COM) will be seen this week from a radiant located at 13:00 (195) +16. This area of the sky is located in southeastern Coma Berenices, two degrees southwest of the fourth magnitude star Alpha Comae Berenices. These meteors are best seen near 0500 LST when the radiant lies highest above the horizon. Rates should currently be less than one per hour no matter your location. At 64 km/sec. the Coma Berenicids will usually produce meteors of swift velocity. As seen from the mid-northern hemisphere (45N) one would expect to see approximately thirteen Sporadic meteors per hour during the last hour before dawn as seen from rural observing sites. Evening rates would be near two per hour. As seen from the mid-southern hemisphere (45S), morning rates would be near fifteen per hour as seen from rural observing sites and three per hour during the evening hours. Locations between these two extremes would see activity between the listed figures. The table below presents a summary of the expected activity this week. Rates and positions are exact for Saturday night/Sunday morning but may be used all week. Antihelion (ANT) - 09:12 (138) +15 Velocity -30km/sec. Hourly Rates - Northern Hemisphere - 3 Southern Hemisphere - 2 Alpha Centaurids (ACE) 12:56 (194) -55 Velocity - 56km/sec. Hourly Rates - Northern Hemisphere - <1 Southern Hemisphere - <1 Coma Berenicids (COM) 13:00 (195) +16 Velocity - 64km/sec. Hourly Rates - Northern Hemisphere - <1 Southern Hemisphere - <1 Clear Skies! Robert Lunsford International Meteor Organization

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