前言
陰雨綿綿，又冷。
望遠鏡都要發霉了，明知道燦爛的冬季星空就在雲後面，卻碰不到。
照例的，很久沒看到星星的我，憂鬱焦慮心情不爽。
既然如此，來作點有建設性的事吧～
之前看完的Deep Sky Magazine，也是個老的發霉的天文雜誌呢，不過卻很好玩，就來分享一下吧！
DEEP SKY 14 Spring 1986 volume 4, number 1
變星 Variable star
By David H.Levy
每期deep sky 都有的專欄。這期介紹的這兩個目標有意思，可能也很簡單，所以記下來希望有機會看看。
目標一
043274 X cameiopardalis :
This Mira-type star’s magnitude range is 8.1 to 12.6 and its period of 143 days is short enough to detect change every week. This star enables you to study the behavior of Miras in accelerated time,with 21/2 light curves during a single year.
這顆變星值得記下來的就是，光度變化大（8.1~12.6等），而且它變的速度很快，週期143天，短到可以每個禮拜都看到光度變化。它完全符合可在一年內觀測整個變星週期，不受季節影響（但受雲影響，唉）。我想拿來練習觀察變星的第一顆倒是不錯。
目標二
122402 3C-273 Virginis :
As the brightest known quasar, 3C-273 Virginis appears as a starlike object of about 13th magnitudes. A quasar (short for quasi-stellar object) is not a variable star but rather the hightly-energetic core of a distant galaxy. If the galaxy were “normal” like M31 or the Milky Way, we would expect to see nothing because of its great distance. But the central part is visible so it appears star like in our telescope.
Observationally, quasars are much like variable stars in the their variations ate slow and highly irregular but manifest themselves in the quasar’s changing brightness.
I fist saw 3C-273 Virginis with a 6-inch reflecting telescope, locating it just as I would find an ordinary variable. When I began to make the estimate(as I would estiate an ordinary variable). I realized that this little point of light may be the most distant object I had ever seen – the core of a galaxy some 920 megaparsecs away. With a sobered and respectful feeling. I continued observing. Estimate this quasar’s brightness once a month. Its variation is slight, but it’s fun to look at an object that far away – so enjoy!
這顆星不是變星，是一顆類星體，也就是說，它不是恆星，反而是一顆發出高能的系外銀河核星，不過因為非常遙遠，所以看起來像是一顆星，也像是變星，因為它的亮度會變化。這顆 3C-273 Virginis 距離有 920 mega- parsecs，parsecs 是一個天文單位。1 parsec = 3.086X1016 約等於3.26光年。mega = 106，算算看就知道，非常非常非常....Xn 遠，若是我看的到的話，那就是我目視可及最遙遠的距離了。
Observing the IC4329 Cluster of galaxies
By Jeff Corder
請看看下面兩張圖顯示位於半人馬座(Centauris)的IC4329 cluster
第一張是作者以手繪製的系外銀河，而下一張則是拍攝的。兩相對照還挺有意思的，我覺得，作者的功力挺不錯的，銀河的相對位置、形狀、大小、都與攝影的十分接近。
Figure 1 : skech
Figure 2 : picture from http://astronomy-mall.com/Adventures.In.Deep.Space/ic4329ch.htm
附上這些星系團的相關資料
其中 M-05-33-005 = Seashell Galaxy
Figure 3 : data of IC4329 galaxy cluster
只可惜太南邊了，台灣要看，不容易。
記得問過王為豪先生業餘天文愛好者可以作些什麼，他說天空中尚有許多星系未發現，天空範圍非常大。（我希望我沒有誤解他意思）不過說真的，沒發現的星系大概也都暗得不得了吧。另一個可以作的事就是發現超新星，根據蔡元生老師說的，機率還蠻大。上週新聞就有一位加拿大小女孩發現一顆，當然，照片是她老爸拍的。http://www.universetoday.com/82152/10-year-old-girl-discovers-a-supernova/
陰雨綿綿，又冷。
望遠鏡都要發霉了，明知道燦爛的冬季星空就在雲後面，卻碰不到。
照例的，很久沒看到星星的我，憂鬱焦慮心情不爽。
既然如此，來作點有建設性的事吧～
之前看完的Deep Sky Magazine，也是個老的發霉的天文雜誌呢，不過卻很好玩，就來分享一下吧！
DEEP SKY 14 Spring 1986 volume 4, number 1
變星 Variable star
By David H.Levy
每期deep sky 都有的專欄。這期介紹的這兩個目標有意思，可能也很簡單，所以記下來希望有機會看看。
目標一
043274 X cameiopardalis :
This Mira-type star’s magnitude range is 8.1 to 12.6 and its period of 143 days is short enough to detect change every week. This star enables you to study the behavior of Miras in accelerated time,with 21/2 light curves during a single year.
這顆變星值得記下來的就是，光度變化大（8.1~12.6等），而且它變的速度很快，週期143天，短到可以每個禮拜都看到光度變化。它完全符合可在一年內觀測整個變星週期，不受季節影響（但受雲影響，唉）。我想拿來練習觀察變星的第一顆倒是不錯。
目標二
122402 3C-273 Virginis :
As the brightest known quasar, 3C-273 Virginis appears as a starlike object of about 13th magnitudes. A quasar (short for quasi-stellar object) is not a variable star but rather the hightly-energetic core of a distant galaxy. If the galaxy were “normal” like M31 or the Milky Way, we would expect to see nothing because of its great distance. But the central part is visible so it appears star like in our telescope.
Observationally, quasars are much like variable stars in the their variations ate slow and highly irregular but manifest themselves in the quasar’s changing brightness.
I fist saw 3C-273 Virginis with a 6-inch reflecting telescope, locating it just as I would find an ordinary variable. When I began to make the estimate(as I would estiate an ordinary variable). I realized that this little point of light may be the most distant object I had ever seen – the core of a galaxy some 920 megaparsecs away. With a sobered and respectful feeling. I continued observing. Estimate this quasar’s brightness once a month. Its variation is slight, but it’s fun to look at an object that far away – so enjoy!
這顆星不是變星，是一顆類星體，也就是說，它不是恆星，反而是一顆發出高能的系外銀河核星，不過因為非常遙遠，所以看起來像是一顆星，也像是變星，因為它的亮度會變化。這顆 3C-273 Virginis 距離有 920 mega- parsecs，parsecs 是一個天文單位。1 parsec = 3.086X1016 約等於3.26光年。mega = 106，算算看就知道，非常非常非常....Xn 遠，若是我看的到的話，那就是我目視可及最遙遠的距離了。
Observing the IC4329 Cluster of galaxies
By Jeff Corder
請看看下面兩張圖顯示位於半人馬座(Centauris)的IC4329 cluster
第一張是作者以手繪製的系外銀河，而下一張則是拍攝的。兩相對照還挺有意思的，我覺得，作者的功力挺不錯的，銀河的相對位置、形狀、大小、都與攝影的十分接近。
Figure 1 : skech
Figure 2 : picture from http://astronomy-mall.com/Adventures.In.Deep.Space/ic4329ch.htm
附上這些星系團的相關資料
其中 M-05-33-005 = Seashell Galaxy
Figure 3 : data of IC4329 galaxy cluster
只可惜太南邊了，台灣要看，不容易。
記得問過王為豪先生業餘天文愛好者可以作些什麼，他說天空中尚有許多星系未發現，天空範圍非常大。（我希望我沒有誤解他意思）不過說真的，沒發現的星系大概也都暗得不得了吧。另一個可以作的事就是發現超新星，根據蔡元生老師說的，機率還蠻大。上週新聞就有一位加拿大小女孩發現一顆，當然，照片是她老爸拍的。http://www.universetoday.com/82152/10-year-old-girl-discovers-a-supernova/
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