کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5487153 | 1523507 | 2017 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The near-Earth asteroid population from two decades of observations
ترجمه فارسی عنوان
جمعیت سیارک نزدیک زمین از دو دهه مشاهدات
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
چکیده انگلیسی
Determining the size and orbital distribution of the population of near-Earth asteroids (NEAs) is the focus of intense research, with the most recent models converging to a population of approximately 1000 NEAs larger than 1 km and up to approximately 109 NEAs with absolute magnitude H < 30. We present an analysis of the combined observations of nine of the leading asteroid surveys over the past two decades, and show that for an absolute magnitude H < 17.75, which is often taken as proxy for an average diameter larger than 1 km, the population of NEAs is 920 ± 10, lower than other recent estimates. The population of small NEAs is estimated at (4 ± 1) à 108 for H < 30, and the number of decameter NEAs is lower than other recent estimates. This population tracks accurately the orbital distribution of recently discovered large NEAs, and produces an estimated Earth impact rate for small NEAs in good agreement with the bolide data.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 284, 1 March 2017, Pages 416-423
Journal: Icarus - Volume 284, 1 March 2017, Pages 416-423
نویسندگان
Pasquale Tricarico,