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The tumbling rotational state of 1I/‘Oumuamua

Fraser, Wesley C.; Pravec, Petr; Fitzsimmons, Alan; Lacerda, Pedro; Bannister, Michele T.; Snodgrass, Colin and Smolić, Igor (2018). The tumbling rotational state of 1I/‘Oumuamua. Nature Astronomy, 2 pp. 383–386.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1038/s41550-018-0398-z
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Abstract

The discovery of 1I/2017 U1 (1I/‘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- and 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 6.9 and 8.3 h. Here, we analyse all the available optical photometry data reported to date. No single rotation period can explain the exhibited brightness variations. Rather, 1I/‘Oumuamua appears to be in an excited rotational state undergoing non-principal axis rotation, or tumbling. A satisfactory solution has apparent lightcurve frequencies of 0.135 and 0.126 h−1 and implies a longest-to-shortest axis ratio of ≳5:1, although the available data are insufficient to uniquely constrain the true frequencies and shape. Assuming a body that responds to non-principal axis rotation in a similar manner to Solar System asteroids and comets, the timescale to damp 1I/‘Oumuamua’s tumbling is at least one billion years. 1I/‘Oumuamua was probably set tumbling within its parent planetary system and will remain tumbling well after it has left ours.

Item Type: Journal Item
Copyright Holders: 2018 Macmillan Publishers Limited, part of Springer Nature
ISSN: 2397-3366
Project Funding Details:
Funded Project NameProject IDFunding Body
Ernest Rutherford FellowshipNot SetSTFC (Science & Technology Facilities Council)
Not SetST/L004569/1STFC (Science & Technology Facilities Council)
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 53758
Depositing User: Colin Snodgrass
Date Deposited: 08 Mar 2018 14:42
Last Modified: 06 Aug 2019 06:57
URI: http://oro.open.ac.uk/id/eprint/53758
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