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27 April 2024 |
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Col-OSSOS: Colors of the Interstellar Planetesimal 1I/2017 U1 in Context with the Solar System | | Michele T. Bannister
; Megan E. Schwamb
; Wesley C. Fraser
; Michael Marsset
; Alan Fitzsimmons
; Susan D. Benecchi
; Pedro Lacerda
; Rosemary E. Pike
; J.J. Kavelaars
; Adam B. Smith
; Sunny O. Stewart
; Shiang-Yu Wang
; Matthew J. Lehner
; | | Date: |
16 Nov 2017 | | Abstract: | The recent discovery by Pan-STARRS1 of 1I/2017 U1 (’Oumuamua), on an unbound
and hyperbolic orbit, offers a rare opportunity to explore the planetary
formation processes of other stars, and the effect of the interstellar
environment on a planetesimal surface. 1I/’Oumuamua’s close encounter with the
inner Solar System in 2017 October was a unique chance to make observations
matching those used to characterize the small-body populations of our own Solar
System. We present near-simultaneous g$^prime$, r$^prime$, and J photometry
and colors of 1I/’Oumuamua from the 8.1-m Frederick C. Gillett Gemini North
Telescope, and $gri$ photometry from the 4.2 m William Herschel Telescope. Our
g$^prime$r$^prime$J observations are directly comparable to those from the
high-precision extit{Colours of the Outer Solar System Origins Survey}
(Col-OSSOS), and offer unique diagnostic information for distinguishing between
outer Solar System surfaces. Substantial, correlated near-infrared and optical
variability is present, with the same trend in both near-infrared and optical.
Our observations confirm that 1I/’Oumuamua rotates with a double-peaked period
of $8.10 pm 0.42$ hours and is a highly elongated body with an axial ratio of
at least 5.3:1, implying that it has significant internal cohesion.
1I/’Oumuamua’s color is at the neutral end of the range of observed $g-r$ and
$r-J$ solar-reflectance colors, relative to asteroids, more distant minor
planets, and to the trans-Neptunian populations measured by Col-OSSOS. The
color of the first interstellar planetesimal is like the colors of the Solar
System, in particular some of the dynamically excited objects of the Kuiper
belt and the less-red Jupiter Trojans. | | Source: | arXiv, 1711.6214 | | Services: | Forum | Review | PDF | Favorites | |
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