# On the Anomalous Acceleration of 1I/2017 U1 ‘Oumuamua

@article{Seligman2019OnTA,
title={On the Anomalous Acceleration of 1I/2017 U1 ‘Oumuamua},
author={Darryl Z. Seligman and Gregory P. Laughlin and Konstantin Batygin},
journal={The Astrophysical Journal},
year={2019}
}
• Published 12 March 2019
• Physics, Geology
• The Astrophysical Journal
We show that the P ~ 8 hr photometric period and the astrometrically measured A_(ng) ~ 2.5 × 10^(−4) cm s^(−2) non-gravitational acceleration (at r ~ 1.4 au) of the interstellar object 1I/2017 ('Oumuamua) can be explained by a nozzle-like venting of volatiles whose activity migrated to track the subsolar location on the object's surface. Adopting the assumption that 'Oumuamua was an elongated a × b × c ellipsoid, this model produces a pendulum-like rotation of the body and implies a long semi…
24 Citations

## Figures from this paper

Anomalous Sun Flyby of 1I/2017 U1 (Oumuamua)
• Physics, Geology
• 2020
The findings of Micheli et al. (Nature2018, 559, 223–226) that 1I/2017 U1 (Oumuamua) showed anomalous orbital accelerations have motivated us to apply an impact model of gravity in search for an
Tidal fragmentation as the origin of 1I/2017 U1 (‘Oumuamua)
• Physics, Geology
• 2020
The first discovered interstellar object (ISO), ‘Oumuamua (1I/2017 U1) shows a dry and rocky surface, an unusually elongated shape, with short-to-long axis ratio c ∕ a  ≲ 1∕6, a low velocity relative
The natural history of ‘Oumuamua
4 The discovery of the first interstellar object (ISO) passing through the Solar System, 1I/2017 U1 5 (‘Oumuamua), provoked intense and continuing interest from the scientific community and the
On the Spin Dynamics of Elongated Minor Bodies with Applications to a Possible Solar System Analogue Composition for ‘Oumuamua
• Physics
The Astrophysical Journal
• 2021
The first interstellar object, 1I/2017 U1 (‘Oumuamua), exhibited several unique properties, including an extreme aspect ratio, a lack of typical cometary volatiles, and a deviation from a Keplerian
Evidence that 1I/2017 U1 (‘Oumuamua) was Composed of Molecular Hydrogen Ice
• Physics
• 2020
Oumuamua (I1 2017) was the first macroscopic ($l\sim100\,{\rm m}$) body observed to traverse the inner solar system on an unbound hyperbolic orbit. Its light curve displayed strong periodic
1I/‘Oumuamua as an N2 Ice Fragment of an exo‐Pluto Surface: I. Size and Compositional Constraints
• Geology, Physics
Journal of Geophysical Research: Planets
• 2021
The origin of the interstellar object 1I/‘Oumuamua has defied explanation. We perform calculations of the non‐gravitational acceleration that would be experienced by bodies composed of a range of
Project Lyra: Catching 1I/'Oumuamua -- Using Laser Sailcraft in 2030
• Physics
• 2020
Discovered in October 2017, the interstellar object designated 1I/'Oumuamua was the first such object to be observed travelling through our solar system. 1I/'Oumuamua has other characteristics never
The natural history of 'Oumuamua
• Geology, Physics
• 2019
How the observed characteristics of Oumuamua are explained by the extensive knowledge of natural minor bodies in the authors' Solar System and the current knowledge of the evolution of planetary systems is discussed.
NAVIGATIONAL FEASIBILITY OF FLYBY / IMPACT MISSIONS TO INTERSTELLAR OBJECTS
In October 2017, the first interstellar object, designated 1I/2017 U1 and more commonly referred to as Oumuamua, was detected passing through our solar system by the Pan-STARRS telescope, followed
Modelling the light curve of ‘Oumuamua: evidence for torque and disc-like shape
• S. Mashchenko
• Physics, Geology
Monthly Notices of the Royal Astronomical Society
• 2019
We present the first attempt to fit the light curve of the interstellar visitor ‘Oumuamua using a physical model that includes optional torque. We consider both conventional (Lommel–Seeliger

## References

SHOWING 1-10 OF 30 REFERENCES
Could Solar Radiation Pressure Explain ‘Oumuamua’s Peculiar Acceleration?
• Physics, Geology
The Astrophysical Journal
• 2018
'Oumuamua (1I/2017 U1) is the first object of interstellar origin observed in the solar system. Recently, Micheli et al. reported that 'Oumuamua showed deviations from a Keplerian orbit at a high
Kinematics of the Interstellar Vagabond 1I/'Oumuamua (A/2017 U1)
The initial Galactic velocity vector for the recently discovered hyperbolic asteroid 1I/'Oumuamua (A/2017 U1) is calculated for before its encounter with our solar system. The latest orbit (JPL-13)
Non-gravitational acceleration in the trajectory of 1I/2017 U1 (‘Oumuamua)
• Physics, Geology
Nature
• 2018
‘Oumuamua—the first known interstellar object to have entered the Solar System—is probably a comet, albeit with unusual dust and chemical properties owing to its origin in a distant solar system.
1I/2017 U1 (Oumuamua) is Hot: Imaging, Spectroscopy and Search of Meteor Activity
• Physics, Geology
• 2017
1I/2017 U1 (Oumuamua), a recently discovered asteroid in a hyperbolic orbit, is likely the first macroscopic object of extrasolar origin identified in the solar system. Here, we present imaging and
Spitzer Observations of Interstellar Object 1I/‘Oumuamua
• Physics, Geology
The Astronomical Journal
• 2018
1I/'Oumuamua is the first confirmed interstellar body in our solar system. Here we report on observations of 'Oumuamua made with the Spitzer Space Telescope on 2017 November 21–22 (UT). We integrated
1I/'Oumuamua is tumbling
• Physics, Geology
• 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
Tumbling motion of 1I/‘Oumuamua and its implications for the body’s distant past
• Physics, Geology
• 2018
Models of the Solar System’s evolution show that almost all the primitive material leftover from the formation of the planets was ejected to the interstellar space as a result of dynamical
Constraints on the Density and Internal Strength of 1I/'Oumuamua
• Geology, Physics
• 2018
1I/'Oumuamua was discovered by the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS 1) on 19 October 2017. Unlike all previously discovered minor planets this object was determined to
Interstellar Interloper 1I/2017 U1: Observations from the NOT and WIYN Telescopes
• Physics, Geology
• 2017
We present observations of the interstellar interloper 1I/2017 U1 ('Oumuamua) taken during its 2017 October flyby of Earth. The optical colors B-V = 0.70$\pm$0.06, V-R = 0.45$\pm$0.05, overlap those
Spin Evolution and Cometary Interpretation of the Interstellar Minor Object 1I/2017 ’Oumuamua
• R. Rafikov
• Physics, Geology
The Astrophysical Journal
• 2018
Observations of the first interstellar minor object 1I/2017 'Oumuamua did not reveal direct signs of outgassing that would have been natural if it had volatile-rich composition. However, a recent