A long-lived horseshoe companion to the Earth

Christou, Apostolos; Asher, D. J.

doi:10.1111/j.1365-2966.2011.18595.x

Cited by 76 publications

(39 citation statements)

References 22 publications

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“…2010 TK 7 is thought to be temporarily captured by Earth, with a dynamical stability timescale of ∼7000 years (Connors et al 2011;Marzari & Scholl 2013). By contrast, 2010 SO 16 librates across the L3 Earth-Sun Lagrange point in a horseshoe pattern that has the longest known stability of any Earth co-orbital, several hundred thousand years (Christou & Asher 2011).…”

Section: Earth Co-orbitalsmentioning

confidence: 99%

“…Among the near-Earth objects discovered by NEOWISE during its post-cryogenic mission is the first known Earth Trojan, 2010 TK 7 and an object in a so-called "horseshoe" orbit co-orbital with Earth, 2010 SO 16 (Connors et al 2011;Christou & Asher 2011;Mainzer et al 2012a). 2010 TK 7 was discovered by NEOWISE because its ∼395-year libration period caused it to move to the region near 90…”

Section: Earth Co-orbitalsmentioning

confidence: 99%

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Space-Based Thermal Infrared Studies of Asteroids

Mainzer¹,

Usui²,

Trilling³

2015

Asteroids IV

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Large-area surveys operating at mid-infrared wavelengths have proven to be a valuable means of discovering and characterizing minor planets. Through the use of radiometric models, it is possible to derive physical properties such as diameters, albedos, and thermal inertia for large numbers of objects. Modern detector array technology has resulted in a significant improvement in spatial resolution and sensitivity compared with previous generations of spacebased infrared telescopes, giving rise to a commensurate increase in the number of objects that have been observed at these wavelengths. Space-based infrared surveys of asteroids therefore offer an effective method of rapidly gathering information about small body populations orbital and physical properties. The AKARI, WISE/NEOWISE, Spitzer, and Herschel missions have significantly increased the number of minor planets with well-determined diameters and albedos.

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Section: Earth Co-orbitalsmentioning

confidence: 99%

Section: Earth Co-orbitalsmentioning

confidence: 99%

Space-Based Thermal Infrared Studies of Asteroids

Mainzer¹,

Usui²,

Trilling³

2015

Asteroids IV

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“…(36017) 1999 ND 43 is a horseshoe librator with Mars (Connors et al 2005). Yet another horseshoe companion of the Earth was found in 2010 SO 16 (Christou & Asher 2011). Additional horseshoe librators with Jupiter were recently identified by Wajer & Królikowska (2012).…”

Section: Introductionmentioning

confidence: 94%

Crantor, a short-lived horseshoe companion to Uranus

Marcos

2013

A&A

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Context. Stable co-orbital motion with Uranus is vulnerable to planetary migration, but temporary co-orbitals may exist today. So far, only two candidates have been suggested, both moving on horseshoe orbits: 83982 Crantor (2002 GO 9 ) and 2000 SN 331 . Aims. (83982) Crantor is currently classified in the group of the Centaurs by the MPC although the value of its orbital period is close to that of Uranus. Here we revisit the topic of the possible 1:1 commensurability of (83982) Crantor with Uranus, explore its dynamical past, and look into its medium-term stability and future orbital evolution. Methods. Our analysis is based on the results of N-body calculations that use the most updated ephemerides and include perturbations by the eight major planets, the Moon, the barycenter of the Pluto-Charon system, and the three largest asteroids. Results. (83982) Crantor currently moves inside Uranus' co-orbital region on a complex horseshoe orbit. The motion of this object is primarily driven by the influence of the Sun and Uranus, although Saturn plays a significant role in destabilizing its orbit. The precession of the nodes of (83982) Crantor, which is accelerated by Saturn, controls its evolution and short-term stability. Although this object follows a temporary horseshoe orbit, more stable trajectories are possible and we present 2010 EU 65 as a long-term horseshoe librator candidate in urgent need of follow-up observations. Available data indicate that the candidate 2000 SN 331 is not a Uranus' co-orbital. Conclusions. Our calculations confirm that (83982) Crantor is currently trapped in the 1:1 commensurability with Uranus but it is unlikely to be a primordial 1:1 librator. Although this object follows a chaotic, short-lived horseshoe orbit, longer term horseshoe stability appears to be possible. We also confirm that high-order resonances with Saturn play a major role in destabilizing the orbits of Uranus co-orbitals.

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“…If objects like 2015 SO 2 are numerous, then they will be intrinsically more difficult to discover than those similar to 2013 BS 45 that reach perigee at 0.013 AU. Asteroid 2013 BS 45 is far less stable than 2015 SO 2 , compare Almost certainly, the most stable known Earth's coorbital is 2010 SO 16 that stays as horseshoe librator for at least 120 kyr and possibly up to 1 Myr (Christou & Asher 2011), remaining in the same co-orbital configuration during this time span. Asteroid 2015 SO 2 may be almost as stable as 2010 SO 16 but it often switches co-orbital configuration.…”

Section: Impact Of Errors: Mccm Treatmentmentioning

confidence: 99%

From horseshoe to quasi-satellite and back again: the curious dynamics of Earth co-orbital asteroid 2015 SO2

Marcos¹,

Marcos²

2015

Astrophys Space Sci

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Earth co-orbitals of the horseshoe type are interesting objects to study for practical reasons. They are relatively easy to access from our planet and that makes them attractive targets for sample return missions. Here, we show that near-Earth asteroid (NEA) 2015 SO 2 is a transient co-orbital to the Earth that experiences a rather peculiar orbital evolution characterised by recurrent, alternating horseshoe and quasisatellite episodes. It is currently following a horseshoe trajectory, the ninth asteroid known to do so. Besides moving inside the 1:1 mean motion resonance with the Earth, it is subjected to a Kozai resonance with the value of the argument of perihelion librating around 270 • . Contrary to other NEAs, asteroid 2015 SO 2 may have remained in the vicinity of Earth's co-orbital region for a few hundreds of thousands of years.

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A long-lived horseshoe companion to the Earth

Cited by 76 publications

References 22 publications

Space-Based Thermal Infrared Studies of Asteroids

Space-Based Thermal Infrared Studies of Asteroids

Crantor, a short-lived horseshoe companion to Uranus

From horseshoe to quasi-satellite and back again: the curious dynamics of Earth co-orbital asteroid 2015 SO2

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