کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1775263 | 1021188 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ground-based visible and near-IR observations of Comet 9P/Tempel 1 during the Deep Impact encounter
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Ground-based visible and near-IR observations of Comet 9P/Tempel 1 during the Deep Impact encounter Ground-based visible and near-IR observations of Comet 9P/Tempel 1 during the Deep Impact encounter](/preview/png/1775263.png)
چکیده انگلیسی
We present the results of our visible and near-IR observations of Comet 9P/Tempel 1 during the Deep Impact encounter. The comet was observed before, during, and after impact from Kitt Peak National Observatory (J, H, K) and Observatorio Astronómico Nacional-San Pedro Mártir, Mexico (B, V, R, I). High time-resolution images in R, J, H, and K the night of impact with a 3.â³5 radius aperture revealed a rapid brightening which had multiple slopes and lasted for approximately 25 min before leveling off. The brightness decreased on subsequent nights and returned to near pre-impact levels by July 8 UT. The R-J, R-H, R-K, J-H, J-K, and H-K colors became bluer the night of impact. The R-J, R-H, and R-K colors remained blue on the night after impact while the J-H, J-K, and H-K colors returned to baseline levels. The observed color changes suggest the bluening was due to an increase in small grains relative to the ambient coma, an increase in ice relative to refractory dust in the coma, or a combination of the two. The ejecta were initially directed towards the southwest but had been driven southeast by solar radiation pressure by the second night after impact. The mean projected ejecta velocity was estimated at 0.20-0.23 kmâsâ1 over the first 24 h after impact.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 191, Issue 2, Supplement, 2007, Pages 403-411
Journal: Icarus - Volume 191, Issue 2, Supplement, 2007, Pages 403-411
نویسندگان
Matthew M. Knight, Kevin J. Walsh, Michael F. A'Hearn, Robert A. Swaters, B. Ashley Zauderer, Nalin H. Samarasinha, Roberto Vázquez, Harold Reitsema,