80年ぶり、いるか座ガンマ流星群なるか?

ナショナルジオグラフィックジャパンHPよりいるか座ガンマ流星群が80年ぶりに見られる可能性がある、との記事を発表しています。

ニュース – 科学&宇宙 – 80年ぶり、いるか座ガンマ流星群 – ナショナルジオグラフィック 公式日本語サイト(ナショジオ) http://www.nationalgeographic.co.jp/news/news_article.php?file_id=20130611001

極大時、1分間に1個程度、ペルセウス座流星群レベルの出現の可能性、極大日時は本日17時半(日本時)なので日本では少し厳しいかもしれません。北アメリカで最適とのことです。

 

国際流星機構(IMO)でもこのいるか座ガンマ流星群の可能性について言及されています(Shcal13.dvi – cal2013.pdf http://www.imo.net/files/data/calendar/cal2013.pdf)。下記をご覧ください。

Possibleγ–Delphinid return: According to information in Peter Jenniskens’ book “Meteor Showers & Their Parent Comets” (Cambridge University Press, 2006), on 1930 June 11, three American Meteor Society observers at the same site in Maryland, USA, apparently saw a short-lived meteor outburst from an otherwise unknown source, theγ-Delphinids, with a radiant estimated as nearα= 312◦,δ= +17◦. The meteors were apparently quite fast-moving (ageocentric velocity of∼57 km/s has been suggested). Activity was seen from the proposed shower during only a thirty-minute interval, 02h15m–02h45mUT, albeit there was a full Moon in the sky throughout. It seems no confirmation of this report was made elsewhere, while the suggested radiant was very low at the claimed time, all of which difficulties create doubts about exactly what the three observers may have witnessed. However, Peter Jenniskens’ has proposed that a fresh return of this possible shower may happen in2013, on June 11 at or around 08h28mUT. As the Moon will be just a slim waxing crescent on this date, observing conditions are ideal for seeing whether any activity occurs or not.No ZHR estimate had been proposed for the event when this Calendar was prepared, nor any indication of the likely particle sizes/meteor brightnesses that might be involved, but anything that does take place should be recorded either by video or very careful visual plotting, to enable further details about the source to be established. If anything happens as predicted from this radiant area, it would be best-seen from sites across North America.

 

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