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Asteroid 2014 YX49: a large transient Trojan of Uranus
de la Fuente Marcos, C.; de la Fuente Marcos, R.
AA(Universidad Complutense de Madrid, Ciudad Universitaria, E-28040 Madrid, Spain ), AB(Universidad Complutense de Madrid, Ciudad Universitaria, E-28040 Madrid, Spain)
Monthly Notices of the Royal Astronomical Society, Volume 467, Issue 2, p.1561-1568 (MNRAS Homepage)
Publication Date:
Astronomy Keywords:
methods: numerical, methods: statistical, celestial mechanics, minor planets, asteroids: individual: 2014 YX49, planets and satellites: individual: Uranus
Abstract Copyright:
2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Bibliographic Code:


In the outer Solar system, primordial Trojan asteroids may have remained dynamically stable for billions of years. Several thousands of them accompany Jupiter in its journey around the Sun and a similarly large population may be hosted by Neptune. In addition, recently captured or transient Jovian and Neptunian Trojans are not uncommon. In contrast, no Trojans of Saturn have been found yet and just one Uranian Trojan is known, 2011 QF99. Here, we discuss the identification of a second Trojan of Uranus: 2014 YX49. Like 2011 QF99, 2014 YX49 is a transient L4 Trojan although it orbits at higher inclination (25.55° versus 10.83°), is larger (absolute magnitude of 8.5 versus 9.7) and its libration period is slightly shorter (5.1 versus 5.9 kyr); contrary to 2011 QF99, its discovery was not the result of a targeted survey. It is less stable than 2011 QF99; our extensive N-body simulations show that 2014 YX49 may have been following a tadpole trajectory ahead of Uranus for about 60 kyr and it can continue doing so for another 80 kyr. Our analysis suggests that it may remain as co-orbital for nearly 1 Myr. As in the case of 2011 QF99, the long-term stability of 2014 YX49 is controlled by Jupiter and Neptune, but it is currently trapped in the 7:20 mean motion resonance with Saturn. Consistently, the dynamical mechanism leading to the capture into and the ejection from the Trojan state involves ephemeral multibody mean motion resonances.
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