象限仪和一月狮子座流星雨雷达观测情况

TWO METEOR SHOWERS IN PROGRESS: The annual Quadrantid meteor shower, caused by debris from shattered comet 2003 EH1, peaked on Jan. 3rd and should be finished--but maybe not. "The Canadian Meteor Orbit Radar (CMOR) is still seeing strong Quadrantid activity," reports Prof. Peter Brown of the University of Western Ontario. "The overnight results have just been processed, and here is a skychart plot showing radiant activity as it appeared around 5 am EST on the morning of Jan. 4th."

"Notice also the relatively strong shower coming right out of the head of Leo," points out Brown. "This is the fast (54 km/s) January Leonids (JLE), first detected a few years ago by CMOR, but usually overlooked as it peaks the same day as the Quadrantids."

"The January Leonid shower is unusual in that it is quite strong (10 meteors per hour) and has an orbit which gets very close to the Sun (perihelion about 0.05 AU). In fact, it has the smallest perihelion of any major shower detected by CMOR. It also has a nearly unbound orbit and is almost certainly associated with an as yet unidentified sungrazing comet. Very little is known about the stream - optical observations would be most helpful, particularly to define the orbit at larger meteoroid sizes. The shower remains active as seen by CMOR until Jan 7."

一年一度的象限仪流星雨，由来自2003 EH1彗星的碎片造成，高峰也许在1月3日，或者没有出现。加拿大西安大略大学教授彼得·布朗报告说：“加拿大流星轨道雷达（CMOR）仍然观测到强烈的象限仪流星活动”。“刚刚处理完整夜的结果，射电天图显示出辐射区的活动，出现在美国东部时间一月4日上午5点。”
布朗指出：“还要注意狮子座头部比较强的活动”，“这是速度较快的（54公里/秒）的一月狮子座流星雨（JLE），几年前 CMOR第一次检测到，因为它的峰值和象限仪流星雨同一天，所以通常被忽略。“
“一月的狮子座流星是异常的，因为它比较强（每小时10颗流星），而且轨道非常接近太阳（0.05AU），实际上，它的近日距比CMOR检测到的大多数流星雨更小，几乎可以肯定与一颗不明的掠日彗星关联，关于这个尘流知道得很少，光学观察，特别是较大的流星体对于确定轨道将很有帮助。CMOR观测到这个流星群活动持续到1月7日。