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- W3098984025 abstract "Asteroid (3200) Phaethon, a B-type asteroid, has been active during its perihelion passages. This asteroid is considered to be a source of the Geminid meteor stream. It is reported that this asteroid is spinning at a rotation period of 3.60 hr and has a top shape (an oblate body with an equatorial ridge) with a mean equatorial diameter of 6.25 km. Here, we report that Phaethon's rotation state may be close to or above its critical rotation period when the bulk density is (a typical bulk density of a B-type asteroid). We found that in this condition, the structure of Phaethon is sensitive to failure unless the cohesive strength is . This result implies that if there are some surface processes driven by, for example, thermal waves, large-scaled deformation may happen and cause mass shedding. From this interpretation, we propose the processes that produced the Geminid meteor stream in the past and dust tails recently. Phaethon initially rotated at a spin period shorter than the current period. The magnitude of structural deformation at this stage was higher than the present spin condition, and a large mass-shedding event, i.e., the Geminid meteor stream, occurred. After this deformation process, the body became more oblate, and its spin slowed down. At this point, while the spin was high enough for the body to have mass-shedding events, the magnitude of these events became small." @default.
- W3098984025 created "2020-11-23" @default.
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- W3098984025 date "2020-03-31" @default.
- W3098984025 modified "2023-10-09" @default.
- W3098984025 title "Mass-shedding Activities of Asteroid (3200) Phaethon Enhanced by Its Rotation" @default.
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- W3098984025 doi "https://doi.org/10.3847/2041-8213/ab7d36" @default.
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