1I/'Oumuamua is tumbling

@inproceedings{Fraser20171IOumuamuaIT,
  title={1I/'Oumuamua is tumbling},
  author={Wesley C. Fraser and Petr Pravec and Alan Fitzsimmons and Pedro Lacerda and Michele T. Bannister and Colin Snodgrass and Igor Smoli'c},
  year={2017}
}
The discovery of 1I/2017 U1 ('Oumuamua) has provided the first glimpse of a planetesimal born in another planetary system. This interloper exhibits a variable colour, within a range that is broadly consistent with local small bodies such as the P/D type asteroids, Jupiter Trojans, and dynamically excited Kuiper Belt Objects. 1I/'Oumuamua appears unusually elongated in shape, with an axial ratio exceeding 5:1. Rotation period estimates are inconsistent and varied, with reported values between 6… 
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