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The natural history of ‘Oumuamua

Bannister, Michele T. and Bhandare, Asmita and Dybczyński, Piotr A. and Fitzsimmons, Alan and Guilbert-Lepoutre, Aurélie and Jedicke, Robert and Knight, Matthew M. and Meech, Karen J. and McNeill, Andrew and Pfalzner, Susanne and Raymond, Sean N. and Snodgrass, Colin and Trilling, David E. and Ye, Quanzhi (2019) The natural history of ‘Oumuamua. Nature Astronomy, 3 (7). pp. 594-602. ISSN 2397-3366. doi:10.1038/s41550-019-0816-x.

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The discovery of the first interstellar object passing through the Solar System, 1I/2017 U1 (‘Oumuamua), provoked intense and continuing interest from the scientific community and the general public. The faintness of ‘Oumuamua, together with the limited time window within which observations were possible, constrained the information available on its dynamics and physical state. Here we review our knowledge and find that in all cases, the observations are consistent with a purely natural origin for ‘Oumuamua. We discuss how the observed characteristics of ‘Oumuamua are explained by our extensive knowledge of natural minor bodies in our Solar System and our current knowledge of the evolution of planetary systems. We highlight several areas requiring further investigation.

Item Type:Article
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URLURL TypeDescription ReadCube access Paper
Meech, Karen J.0000-0002-2058-5670
Trilling, David E.0000-0003-4580-3790
Ye, Quanzhi0000-0002-4838-7676
Additional Information:© 2019 Springer Nature Publishing AG. Received 31 January 2019; Accepted 15 May 2019; Published 01 July 2019. We thank the International Space Science Institute (ISSI Bern), which made this collaboration possible. A.F., M.T.B. and C.S. acknowledge support from UK Science and Technology Facilities Council grants ST/P0003094/1 and ST/L004569/1. K.J.M. acknowledges support through NSF awards AST1617015, in addition to support for HST programmes GO/DD-15405 and -15447 provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy under NASA contract NAS 5-26555. Q.Y. is supported by the GROWTH project funded by the National Science Foundation under Grant No. 1545949. This research was partially supported by the project 2015/17/B/ST9/01790 funded by the National Science Centre in Poland. M.M.K. acknowledges support from NASA Near Earth Object Observations grant no. NNX17AK15G. A.G.-L. acknowledges funding from the European Research Council under grant agreement no. 802699. A.M. and D.E.T. are supported in part by Spitzer/NASA through an award issued by JPL/Caltech. S.N.R. acknowledges helpful discussions with P. Armitage related to the interstellar object number/mass density, and the Virtual Planetary Laboratory research team, funded by the NASA Astrobiology Program under NASA Grant Number 80NSSC18K0829. This work benefited from participation in the NASA Nexus for Exoplanet Systems Science research coordination network. Data availability: The authors declare that the main data supporting the findings of this study are available within the article. Extra data are available from the corresponding author upon request. Author Contributions: M.M.K. and A.F. organized the ISSI team. K.J.M. created Figs. 1 and 2. S.N.R. conducted the modelling of inferred interstellar object number density and created Fig. 3. M.M.K., A.F. and R.J. created Fig. 4 from source data provided by T. Engelhardt. All authors discussed the topics in the paper, contributed to the writing and commented on the manuscript at all stages. The authors declare no competing interests.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)ST/P0003094/1
Science and Technology Facilities Council (STFC)ST/L004569/1
NASA Hubble FellowshipGO/DD-15405
NASA Hubble FellowshipGO/DD-15447
NASANAS 5-26555
National Science Centre (Poland)2015/17/B/ST9/01790
European Research Council (ERC)802699
Subject Keywords:Asteroids, comets and Kuiper belt; Time-domain astronomy
Issue or Number:7
Record Number:CaltechAUTHORS:20190725-130657157
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97422
Deposited By: Tony Diaz
Deposited On:25 Jul 2019 20:52
Last Modified:16 Nov 2021 17:31

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