کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1774843 | 1021176 | 2009 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Placing the Deep Impact Mission into context: Two decades of observations of 9P/Tempel 1 from McDonald Observatory
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
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![عکس صفحه اول مقاله: Placing the Deep Impact Mission into context: Two decades of observations of 9P/Tempel 1 from McDonald Observatory Placing the Deep Impact Mission into context: Two decades of observations of 9P/Tempel 1 from McDonald Observatory](/preview/png/1774843.png)
چکیده انگلیسی
We report on low-spectral resolution observations of Comet 9P/Tempel 1 from 1983, 1989, 1994 and 2005 using the 2.7 m Harlan J. Smith telescope of McDonald Observatory. This comet was the target of NASA's Deep Impact mission and our observations allowed us to characterize the comet prior to the impact. We found that the comet showed a decrease in gas production from 1983 to 2005, with the decrease being different factors for different species. OH decreased by a factor 2.7, NH by 1.7, CN by 1.6, C3 by 1.8, CH by 1.4 and C2 by 1.3. Despite the decrease in overall gas production and these slightly different decrease factors, we find that the gas production rates of OH, NH, C3, CH and C2 ratioed to that of CN were constant over all of the apparitions. We saw no change in the production rate ratios after the impact. We found that the peak gas production occurred about two months prior to perihelion. Comet Tempel 1 is a “normal” comet.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 199, Issue 1, January 2009, Pages 119-128
Journal: Icarus - Volume 199, Issue 1, January 2009, Pages 119-128
نویسندگان
A.L. Cochran, E.S. Barker, M.D. Caballero, J. Györgey-Ries,