矩尺座γ流星雨

矩尺座γ流星雨出現時看似是散亂流星,因為在它活躍期間的ZHR值與背景流星的數值仍是難以區分的,但是它的峰值相當尖銳,ZHR達到最大值的3或4的時間只有一天或兩天。在過去的觀測中最大值出現的時段並不明確,有時活躍的時間很寬廣,或者較不明顯。它的活躍期在2月25日至3月22日之間,輻射點在赤經239度,赤緯-50度,流星的速度為每秒56公里。

從有限的數據中,在1999年建議極大期可能出現在太陽位於黃經350至357之間,也就是大約在每年的3月10日至17日。而從錄影的觀測中顯示以前所認定的輻射點可能並不正確,因此需要更多的觀測資料來做更確實的認定。在子夜過後的觀測能獲得較佳的效果,因為在南半球的輻射點在子夜之後才能上升至合理的高度(在北半球許多地區看不見輻射點)。

觀測預報

這個流星雨非常需要有計劃的觀測,預測2008年的極大期在3月13日,3月14日才是上弦月,因此是很適合觀測的一年,而所有的觀測技術都可以被使用。 2010年的極大期預測在3/14,雖然靠近朔,幾乎沒什麼月光影響,但是平均ZHR只有6,其他活動期間也只有ZHR~3而已,幾乎與偶發流星沒什麼兩樣。而且由於對臺灣地區而言,矩尺座的位置非常南邊,受到大氣層的影響,可以看見的流星數量會比緯度較南或南半球的地區更少。

參考資料

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