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This past June, research by Marco Micheli et al was published in Nature:
https://www.nature.com/articles/s41586-018-0254-4/
The gist of this article is that 'Oumuamua, (aka 1L/2017 U1) 2017's interstellar asteroid, was not following a strictly gravitational path around the sun. There is practical certainty (30 sigma) that it was being pushed away from the sun during its transit. The out-gassing of comets causes them to be similarly pushed away from the sun, but there was no other indication that 'Oumuamua might be out-gassing. More specifically, out-gassing should have resulted in a change in 'Oumuamua's angular velocity and no such change occurred.
There is now a recent article by Shmuel Bialy and Abraham Loeb
https://arxiv.org/abs/1810.11490
They demonstrate that if 'Oumuamua is very thin, solar radiation could explain the observed trajectory - and that such an asteroid could have survived a trek to our Solar System.
https://www.nature.com/articles/s41586-018-0254-4/
The gist of this article is that 'Oumuamua, (aka 1L/2017 U1) 2017's interstellar asteroid, was not following a strictly gravitational path around the sun. There is practical certainty (30 sigma) that it was being pushed away from the sun during its transit. The out-gassing of comets causes them to be similarly pushed away from the sun, but there was no other indication that 'Oumuamua might be out-gassing. More specifically, out-gassing should have resulted in a change in 'Oumuamua's angular velocity and no such change occurred.
There is now a recent article by Shmuel Bialy and Abraham Loeb
https://arxiv.org/abs/1810.11490
They demonstrate that if 'Oumuamua is very thin, solar radiation could explain the observed trajectory - and that such an asteroid could have survived a trek to our Solar System.