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Title:
A resonant family of dynamically cold small bodies in the near-Earth asteroid belt
Authors:
de la Fuente Marcos, C.; de la Fuente Marcos, R.
Affiliation:
AA(Universidad Complutense de Madrid, Ciudad Universitaria, E-28040 Madrid, Spain; ), AB(Universidad Complutense de Madrid, Ciudad Universitaria, E-28040 Madrid, Spain)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 434, Issue 1, p.L1-L5 (MNRAS Homepage)
Publication Date:
07/2013
Origin:
OUP
Astronomy Keywords:
celestial mechanics, minor planets, asteroids: individual: 2003 YN107, minor planets, asteroids: individual: 2006 JY26, minor planets, asteroids: individual: 2012 FC71, minor planets, asteroids: individual: 2013 BS45, planets and satellites: individual: Earth
Abstract Copyright:
2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnrasl/slt062
Bibliographic Code:
2013MNRAS.434L...1D

Abstract

Near-Earth objects (NEOs) moving in resonant, Earth-like orbits are potentially important. On the positive side, they are the ideal targets for robotic and human low-cost sample return missions and a much cheaper alternative to using the Moon as an astronomical observatory. On the negative side and even if small in size (2-50 m), they have an enhanced probability of colliding with the Earth causing local but still significant property damage and loss of life. Here, we show that the recently discovered asteroid 2013 BS45 is an Earth co-orbital, the sixth horseshoe librator to our planet. In contrast with other Earth's co-orbitals, its orbit is strikingly similar to that of the Earth yet at an absolute magnitude of 25.8, an artificial origin seems implausible. The study of the dynamics of 2013 BS45 coupled with the analysis of NEO data show that it is one of the largest and most stable members of a previously undiscussed dynamically cold group of small NEOs experiencing repeated trappings in the 1:1 commensurability with the Earth. This new resonant family is well constrained in orbital parameter space and it includes at least 10 other transient members: 2003 YN107, 2006 JY26, 2009 SH2 and 2012 FC71 among them. 2012 FC71 represents the best of both worlds as it is locked in a Kozai resonance and is unlikely to impact the Earth. These objects are not primordial and may have originated within the Venus-Earth-Mars region or in the main-belt, then transition to Amor-class asteroid before entering Earth's co-orbital region. Objects in this group could be responsible for the production of Earth's transient irregular natural satellites.
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