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A general method for assessing the origin of interstellar small bodies: the case of 1I/2017 U1 (Oumuamua) | Jorge I. Zuluaga
; Oscar Sanchez-Hernandez
; Mario Sucerquia
; Ignacio Ferrin
; | Date: |
26 Nov 2017 | Abstract: | With the advent of more and deeper sky surveys, the discovery of interstellar
small objects entering into the Solar System has been finally possible. In
October 19, 2017, using observations of the PANSTARRS survey, a fast moving
object, now officially named 1I/2017 U1 (Oumuamua), was discovered in a
heliocentric unbound trajectory suggesting an interstellar origin. Assessing
the provenance of interstellar small objects is key for understanding their
distribution, spatial density and the processes responsible for their ejection
from planetary system. However, their peculiar trajectories place a limit on
the number of observations available to determine a precise orbit. As a result,
when its position is propagated $sim 10^5-10^6$ years backward in time, small
errors in orbital elements become large uncertainties in position in the
interstellar space. In this paper we present a general method for assigning
probabilities to nearby stars of being the parent system of an observed
interstellar object. We describe the method in detail and apply it for
assessing the origin of 1I/2017 U1. A preliminary list of potential progenitors
and their corresponding probabilities is provided. In the future, when further
information about the object and/or the nearby stars be refined, the
probabilities computed with our method can be updated. We provide all the data
and codes we developed for this purpose in the form of an open source
C++/Python package, iWander is publicly available at
this http URL | Source: | arXiv, 1711.9397 | Services: | Forum | Review | PDF | Favorites |
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