کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8137141 1523542 2015 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Obliquities of “top-shaped” asteroids may not imply reshaping by YORP spin-up
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
Obliquities of “top-shaped” asteroids may not imply reshaping by YORP spin-up
چکیده انگلیسی
The timescales over which the YORP effect alters the rotation period and the obliquity of a small asteroid can be very different, because the corresponding torques couple to different aspects of the object's shape. For nearly axisymmetric, “top-shaped” near-Earth asteroids such as 101955 Bennu, spin timescales are an order of magnitude or more longer than obliquity timescales, which are ∼105 to 106yr. The observed low obliquities (near 0° or 180°) of top-shaped asteroids do not constitute evidence that they acquired their present shapes and spins through YORP spin-up, because low obliquities are expected regardless of the spin-up or reshaping mechanism.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 248, 1 March 2015, Pages 313-317
نویسندگان
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