Re: [心得] 市區可以拍到c/2012 S1 ISON 艾桑彗星了
http://www.flickr.com/photos/evanzxcv/10273910575/
得知ISON已經夠亮的消息,今天早上4:45就起床,
用Stellarium查得彗星位置後,立刻整裝前往住處附近的廢棄鐵路平交道,
架好相機、認出火星與軒轅十四,開始連拍.
(發現我選的這天彗星、火星、軒轅十四恰巧接近一直線)
我手邊沒有望遠鏡與赤道儀,因此直接使用70-300mm的望遠鏡頭拍攝,
但為了讓火星和軒轅十四同時入鏡,只轉到200mm左右.
由於外面溫度只有5度,加上5:22就是天文曙光了,因此沒拍太久,
以每張曝光2秒連拍128張,加上暗場、偏壓、平場各64張,送進DeepSkyStacker疊圖.
儘管DSS可將恆星與彗星分別疊圖以確保彗星影像清晰不拖線,
但因為4-5分鐘內彗星相對背景恆星移動相當有限,加上單張照片上也看不出彗星,
因此沒有特別點出彗星位置就直接疊了.
疊合後原圖即可見彗星,對比加強後彗尾更為清晰、方向也對,
可明顯辨認出是彗星而非其他天體.
圖上彗星部份的對比另外加強過,以顯現結構特徵.
下面紅色和藍色亮星分別為火星和軒轅十四.
從照片上目測比對亮度相近的恆星,彗星亮度大約只有12等星,
和預測的9-10等星有一段差距,個人推測可能是因彗星為展源,
加上曝光過程中彗星相對於背景恆星有些微移動,以致疊圖後曝光不夠集中.
(但根據aerith網站則亮度相當符合:
http://www.aerith.net/comet/catalog/2012S1/2012S1.html )
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◆ From: 18.189.71.162
※ 編輯: evanzxcv 來自: 18.189.71.162 (10/15 02:03)
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