ふたご座流星群観測報告

<BODY marginwidth="20" marginheight="20" topmargin="20" leftmargin="20"> <DIV class="standard_width"> <H1>■ふたご座流星群観測報告</H1> <P>2004年もいよいよ師走。｢年間の総決算｣ふたご群がやってきました。この１年を振り返ってみると、｢裏年｣しぶんぎ群と、｢大出現ならず｣ジャコビニ群こそヤラレましたが(あ、両方とも｢りゅう座流星群｣だ(^^;)、そのほかは</P> <TABLE border="0" cellspacing="0" cellpadding="0"> <TR> <TD><P class="s">　　　　　６年ぶり出現するか！？</P></TD> <TD><P class="s">　注目のポン･ウィンネッケ群</P></TD> <TD><P class="s">　→　<STRONG>見事突発観測</STRONG></P></TD> </TR> <TR> <TD><P class="s">　　　　　好条件！突発の予想も…</P></TD> <TD><P class="s">　注目のペルセ群</P></TD> <TD><P class="s">　→　<STRONG>見事極大期観測</STRONG></P></TD> </TR> <TR> <TD><P class="s">　　　　　まだまだトレイル健在？</P></TD> <TD><P class="s">　注目のしし群</P></TD> <TD><P class="s">　→　<STRONG>見事トレイル確認</STRONG></P></TD> </TR> </TABLE> <P>といった具合で、なかなかに満足いく結果。ここ２年の厄からようやく抜け出した気がします。ふたご群もこの調子で行きたいとこですが･･･　それでは、<STRONG>条件最高！大出現必至！</STRONG>　注目のふたご群、行ってみましょう！</P> <HR size="1"> <H3>■観測結果</H3> <TABLE border="0" width="480" cellspacing="1" cellpadding="1" align="center"> <TR valign="top"> <TD><STRONG>観測地：</STRONG></TD> <TD>竜天天文台公園（岡山県赤磐郡吉井町）　標高470m<BR> 東経134°00′08″　北緯34°53′38″　（世界測地系）</TD> </TR> <TR valign="top"> <TD><STRONG>観測者：</STRONG></TD> <TD>L!b</TD> </TR> <TR valign="top"> <TD><STRONG>観測方法：</STRONG></TD> <TD>眼視計数観測（天頂方向）</TD> </TR> </TABLE> <TABLE border="0" width="480" cellspacing="0" cellpadding="1" align="center"> <TR valign="bottom"> <TH class="tone4"><SPAN class="white">日付</SPAN></TH> <TH class="tone4"><SPAN class="white">開始</SPAN></TH> <TH class="tone4"><SPAN class="white">終了</SPAN></TH> <TH class="tone4"><SPAN class="white">分</SPAN></TH> <TH class="tone4"><SPAN class="white">全<BR>流<BR>星</SPAN></TH> <TH class="tone4"><SPAN class="white">散<BR>在</SPAN></TH> <TH class="tone4"><SPAN class="white">ふ<BR>た<BR>ご</SPAN></TH> <TH class="tone4"><SPAN class="white">オ<BR>リ<BR>オ<BR>ン</SPAN></TH> <TH class="tone4"><SPAN class="white">う<BR>み<BR>へ<BR>び</SPAN></TH> <TH class="tone4"><SPAN class="white">い<BR>っ<BR>か<BR>く<BR>じ<BR>ゅ<BR>う</SPAN></TH> <TH class="tone4"><SPAN class="white">最<BR>微</SPAN></TH> <TH class="tone4"><SPAN class="white">雲<BR>量</SPAN></TH> </TR> <TR> <TD colspan="12" class="tone2"><STRONG>　2004年12月</STRONG></TD> </TR> <TR> <TH class="tone0"><SPAN class="color">11/12</SPAN></TH> <TH class="tone0"><SPAN class="color">0:30</SPAN></TH> <TH class="tone0"><SPAN class="color">1:30</SPAN></TH> <TH class="tone0"><SPAN class="color">60</SPAN></TH> <TH class="tone0"><SPAN class="black">29</SPAN></TH> <TH class="tone0"><SPAN class="black">8</SPAN></TH> <TH class="tone0"><SPAN class="red">18</SPAN></TH> <TH class="tone0"><SPAN class="black">1</SPAN></TH> <TH class="tone0"><SPAN class="black">1</SPAN></TH> <TH class="tone0"><SPAN class="black">1</SPAN></TH> <TH class="tone0"><SPAN class="color">6.3</SPAN></TH> <TH class="tone0"><SPAN class="color">0.0</SPAN></TH> </TR> <TR> <TH class="tone0"><SPAN class="color">　</SPAN></TH> <TH class="tone0"><SPAN class="color">1:30</SPAN></TH> <TH class="tone0"><SPAN class="color">2:30</SPAN></TH> <TH class="tone0"><SPAN class="color">60</SPAN></TH> <TH class="tone0"><SPAN class="black">34</SPAN></TH> <TH class="tone0"><SPAN class="black">11</SPAN></TH> <TH class="tone0"><SPAN class="red">19</SPAN></TH> <TH class="tone0"><SPAN class="black">1</SPAN></TH> <TH class="tone0"><SPAN class="black">3</SPAN></TH> <TH class="tone0"><SPAN class="black">0</SPAN></TH> <TH class="tone0"><SPAN class="color">6.4</SPAN></TH> <TH class="tone0"><SPAN class="color">0.0</SPAN></TH> </TR> <TR> <TH class="tone1"><SPAN class="color">12/13</SPAN></TH> <TH class="tone1"><SPAN class="color">1:00</SPAN></TH> <TH class="tone1"><SPAN class="color">2:00</SPAN></TH> <TH class="tone1"><SPAN class="color">45</SPAN></TH> <TH class="tone1"><SPAN class="black">45</SPAN></TH> <TH class="tone1"><SPAN class="black">8</SPAN></TH> <TH class="tone1"><SPAN class="red">36</SPAN></TH> <TH class="tone1"><SPAN class="black">1</SPAN></TH> <TH class="tone1"><SPAN class="black">0</SPAN></TH> <TH class="tone1"><SPAN class="black">0</SPAN></TH> <TH class="tone1"><SPAN class="color">6.4</SPAN></TH> <TH class="tone1"><SPAN class="color">0.2</SPAN></TH> </TR> <TR> <TH class="tone1"><SPAN class="color">　</SPAN></TH> <TH class="tone1"><SPAN class="color">2:00</SPAN></TH> <TH class="tone1"><SPAN class="color">3:00</SPAN></TH> <TH class="tone1"><SPAN class="color">60</SPAN></TH> <TH class="tone1"><SPAN class="black">76</SPAN></TH> <TH class="tone1"><SPAN class="black">21</SPAN></TH> <TH class="tone1"><SPAN class="red">51</SPAN></TH> <TH class="tone1"><SPAN class="black">2</SPAN></TH> <TH class="tone1"><SPAN class="black">1</SPAN></TH> <TH class="tone1"><SPAN class="black">1</SPAN></TH> <TH class="tone1"><SPAN class="color">6.4</SPAN></TH> <TH class="tone1"><SPAN class="color">0.0</SPAN></TH> </TR> <TR> <TH class="tone1"><SPAN class="color">　</SPAN></TH> <TH class="tone1"><SPAN class="color">3:00</SPAN></TH> <TH class="tone1"><SPAN class="color">3:55</SPAN></TH> <TH class="tone1"><SPAN class="color">55</SPAN></TH> <TH class="tone1"><SPAN class="black">62</SPAN></TH> <TH class="tone1"><SPAN class="black">12</SPAN></TH> <TH class="tone1"><SPAN class="red">46</SPAN></TH> <TH class="tone1"><SPAN class="black">1</SPAN></TH> <TH class="tone1"><SPAN class="black">2</SPAN></TH> <TH class="tone1"><SPAN class="black">1</SPAN></TH> <TH class="tone1"><SPAN class="color">6.4</SPAN></TH> <TH class="tone1"><SPAN class="color">0.0</SPAN></TH> </TR> <TR> <TH class="tone0"><SPAN class="color">13/14</SPAN></TH> <TH class="tone0"><SPAN class="color">22:00</SPAN></TH> <TH class="tone0"><SPAN class="color">23:00</SPAN></TH> <TH class="tone0"><SPAN class="color">60</SPAN></TH> <TH class="tone0"><SPAN class="black">84</SPAN></TH> <TH class="tone0"><SPAN class="black">4</SPAN></TH> <TH class="tone0"><SPAN class="red">77</SPAN></TH> <TH class="tone0"><SPAN class="black">1</SPAN></TH> <TH class="tone0"><SPAN class="black">1</SPAN></TH> <TH class="tone0"><SPAN class="black">1</SPAN></TH> <TH class="tone0"><SPAN class="color">6.1</SPAN></TH> <TH class="tone0"><SPAN class="color">0.0</SPAN></TH> </TR> <TR> <TH class="tone0"><SPAN class="color">　</SPAN></TH> <TH class="tone0"><SPAN class="color">23:00</SPAN></TH> <TH class="tone0"><SPAN class="color">0:05</SPAN></TH> <TH class="tone0"><SPAN class="color">65</SPAN></TH> <TH class="tone0"><SPAN class="black">90</SPAN></TH> <TH class="tone0"><SPAN class="black">11</SPAN></TH> <TH class="tone0"><SPAN class="red">79</SPAN></TH> <TH class="tone0"><SPAN class="black">0</SPAN></TH> <TH class="tone0"><SPAN class="black">0</SPAN></TH> <TH class="tone0"><SPAN class="black">0</SPAN></TH> <TH class="tone0"><SPAN class="color">6.2</SPAN></TH> <TH class="tone0"><SPAN class="color">0.0</SPAN></TH> </TR> <TR> <TH class="tone0"><SPAN class="color">　</SPAN></TH> <TH class="tone0"><SPAN class="color">0:30</SPAN></TH> <TH class="tone0"><SPAN class="color">1:10</SPAN></TH> <TH class="tone0"><SPAN class="color">40</SPAN></TH> <TH class="tone0"><SPAN class="black">68</SPAN></TH> <TH class="tone0"><SPAN class="black">6</SPAN></TH> <TH class="tone0"><SPAN class="red">60</SPAN></TH> <TH class="tone0"><SPAN class="black">2</SPAN></TH> <TH class="tone0"><SPAN class="black">0</SPAN></TH> <TH class="tone0"><SPAN class="black">0</SPAN></TH> <TH class="tone0"><SPAN class="color">6.2</SPAN></TH> <TH class="tone0"><SPAN class="color">0.0</SPAN></TH> </TR> <TR> <TH class="tone0"><SPAN class="color">　</SPAN></TH> <TH class="tone0"><SPAN class="color">1:10</SPAN></TH> <TH class="tone0"><SPAN class="color">1:50</SPAN></TH> <TH class="tone0"><SPAN class="color">40</SPAN></TH> <TH class="tone0"><SPAN class="black">95</SPAN></TH> <TH class="tone0"><SPAN class="black">11</SPAN></TH> <TH class="tone0"><SPAN class="red">79</SPAN></TH> <TH class="tone0"><SPAN class="black">2</SPAN></TH> <TH class="tone0"><SPAN class="black">2</SPAN></TH> <TH class="tone0"><SPAN class="black">1</SPAN></TH> <TH class="tone0"><SPAN class="color">6.2</SPAN></TH> <TH class="tone0"><SPAN class="color">0.3</SPAN></TH> </TR> <TR> <TH class="tone0"><SPAN class="color">　</SPAN></TH> <TH class="tone0"><SPAN class="color">3:20</SPAN></TH> <TH class="tone0"><SPAN class="color">4:10</SPAN></TH> <TH class="tone0"><SPAN class="color">50</SPAN></TH> <TH class="tone0"><SPAN class="black">128</SPAN></TH> <TH class="tone0"><SPAN class="black">15</SPAN></TH> <TH class="tone0"><SPAN class="red">106</SPAN></TH> <TH class="tone0"><SPAN class="black">2</SPAN></TH> <TH class="tone0"><SPAN class="black">3</SPAN></TH> <TH class="tone0"><SPAN class="black">2</SPAN></TH> <TH class="tone0"><SPAN class="color">6.1</SPAN></TH> <TH class="tone0"><SPAN class="color">0.2</SPAN></TH> </TR> <TR> <TH class="tone0"><SPAN class="color">　</SPAN></TH> <TH class="tone0"><SPAN class="color">4:10</SPAN></TH> <TH class="tone0"><SPAN class="color">5:00</SPAN></TH> <TH class="tone0"><SPAN class="color">50</SPAN></TH> <TH class="tone0"><SPAN class="black">80</SPAN></TH> <TH class="tone0"><SPAN class="black">15</SPAN></TH> <TH class="tone0"><SPAN class="red">64</SPAN></TH> <TH class="tone0"><SPAN class="black">0</SPAN></TH> <TH class="tone0"><SPAN class="black">1</SPAN></TH> <TH class="tone0"><SPAN class="black">0</SPAN></TH> <TH class="tone0"><SPAN class="color">6.1</SPAN></TH> <TH class="tone0"><SPAN class="color">0.0</SPAN></TH> </TR> <TR> <TH class="tone0"><SPAN class="color">　</SPAN></TH> <TH class="tone0"><SPAN class="color">5:00</SPAN></TH> <TH class="tone0"><SPAN class="color">5:50</SPAN></TH> <TH class="tone0"><SPAN class="color">50</SPAN></TH> <TH class="tone0"><SPAN class="black">70</SPAN></TH> <TH class="tone0"><SPAN class="black">7</SPAN></TH> <TH class="tone0"><SPAN class="red">61</SPAN></TH> <TH class="tone0"><SPAN class="black">0</SPAN></TH> <TH class="tone0"><SPAN class="black">2</SPAN></TH> <TH class="tone0"><SPAN class="black">0</SPAN></TH> <TH class="tone0"><SPAN class="color">6.1</SPAN></TH> <TH class="tone0"><SPAN class="color">0.0</SPAN></TH> </TR> <TR> <TH class="tone2"><SPAN class="color">合計</SPAN></TH> <TH class="tone2"><SPAN class="color">　</SPAN></TH> <TH class="tone2"><SPAN class="color">　</SPAN></TH> <TH class="tone2"><SPAN class="color">635</SPAN></TH> <TH class="tone2"><SPAN class="black">861</SPAN></TH> <TH class="tone2"><SPAN class="black">129</SPAN></TH> <TH class="tone2"><SPAN class="red">696</SPAN></TH> <TH class="tone2"><SPAN class="black">13</SPAN></TH> <TH class="tone2"><SPAN class="black">16</SPAN></TH> <TH class="tone2"><SPAN class="black">7</SPAN></TH> <TH class="tone2"><SPAN class="color">　</SPAN></TH> <TH class="tone2"><SPAN class="color">　</SPAN></TH> </TR> </TABLE> <DIV class="s red">※12月12/13日 1:18-1:33中断</DIV> <P><IMG alt="ＨＲ" src="hr.gif" width="480" height="240"></P> <HR size="1"> <H3>■観測日記</H3> <H5>●12月11/12日</H5> <UL> 今回の観測から新兵器・ICレコーダー導入です。いや、ずっと以前から導入しようとは思っていたんですが、なにぶんモノを買うときには慎重に、検討に検討を重ね、挙句の果て買いあぐねるという性格なもので･･･　まあ、そんなわけで、今夜はその試運転でもあります。観測のほうですが、空の条件は上々、0:30からスタートしてとりあえず3時間･･･と思ったのですが、やはりというかまたもやというか2時間でダウン。1時間余りのメンテの後再起動してみると、やはりというかまたもやというか？雲がでろでろ～･･･　結局2時間の観測となりました。さて、極大2夜前のふたご群、HR＝約20でまず順調といったところ。 </UL> <H5>●12月12/13日</H5> <UL> 極大前夜。日中に気圧の谷が通過し、天気は夜には西から回復傾向。＋夜には東からぶりゅ～氏襲来、観測できるかなぁ？とか思っていたら、夜半ごろから急速回復、見事、晴れました。ワタワタと準備して、1:00より観測開始。4:00を目前に再び曇られるまでの3時間足らず、観測できました。さて、結果ですが、さすがふたご群、前夜から飛ばしてますなあ。HR＝約50で、きっちり予想通り。 </UL> <H5>●12月13/14日</H5> <UL> いよいよ極大夜。おそらく今夜は2001年のあの日以来、日本で最も多く流星が見える日でしょう。もっとも、アレは桁違いですが･･･　そんな極大夜ですが、日中からいろいろ立て込み、22時前になってようやく観測体制に。いやぁ、出てますねえ。ペース配分を考えて0時過ぎから休憩を入れたものの、どうにもウズウズして腹ごしらえをしたら早々に復帰。そして輻射点が天頂に差し掛かり、いよいよクライマックスを迎える頃になって･･･アレレ？シリウスが滲んできた･･･そうです、雲襲来！　結局一番いいところで1時間半ほど曇られてしまいました。それでも今夜のふたご群、HR＝120以上をマーク、しし群の流星雨を除けば自己新です。 </UL> <HR size="1"> <P>というわけで、チト画竜点睛を欠いてしまいましたが、それでもふたご群の活発な活動をしっかりと堪能いたしました。充実の2004年はこれにて終了！　この調子で来年は、アレとアレを捕らえたいものですね。</P> <DIV align="right" 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