Discovery of the triple asteroidal system 87 Sylvia

Marchis, Franck; Descamps, P.; Hestroffer, Daniel; Berthier, J.

doi:10.1038/nature04018

Cited by 105 publications

(139 citation statements)

References 18 publications

(8 reference statements)

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“…In this case, several orbits with identical likelihoods can be found, and the search ranges for the orbital parameters are manually set (Noll et al 2004). We added non-gravitational effects, such as the precessions of the lines of nodes due to an irregularly shaped primary, to the geometrical model developed by Descamps (2005), giving us the possibility of deriving an estimate of the dynamical J 2 of the triple asteroid system (87) Sylvia (Marchis et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Determination of binary asteroid orbits with a genetic-based algorithm

Vachier

Berthier

Marchis

2012

A&A

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Aims. Over the past decade, discoveries of multiple and binary asteroid systems have played a significant role in our general understanding of small solar system bodies. Direct observations of satellites of asteroids are rare and difficult since they require the use of already over-subscribed facilities such as adaptive optics (AO) on large 8−10 m class telescopes and the Hubble Space Telescope (HST). The scarcity of data and the long temporal baseline of observations (up to 10 years) significantly complicate the determination of the mutual orbits of these systems. Methods. We implemented a new approach for determining the mutual orbits of directly-imaged multiple asteroids using a geneticbased algorithm. This approach was applied to several known binary asteroid systems (22 Kalliope, 3749 Balam, and 50 000 Quaoar) observed with AO systems and HST. This statistical method is fast enough to permit the search for an orbital solution across a large parameter space and without a priori information about the mutual orbit. Results. From 10 years of observation, we derived an orbital solution for Linus, companion of (22) Kalliope, with an accuracy close to the astrometric limit provided by the AO observations, assuming a purely Keplerian orbit. A search for non-Keplerian orbit confirmed that a J 2 ∼ 0 is the best-fitting solution. We show that the precession of the nodes could be detected without ambiguity, implying that Kalliope's primary may have an inhomogeneous internal structure. HST astrometric observations of Weywot, companion of the trans-Neptunian object (50 000) Quaoar, were used to derive its mass and its bulk density, which appears to be higher than the density of other TNOs. Finally, we derived a bundle of orbital solutions for (3749) Balam, with equally good fits, from the limited set of astrometric positions. They provide a realistic density between 1.3 and 3.7 g/cm 3 for this S-type asteroid.

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Section: Introductionmentioning

confidence: 99%

Determination of binary asteroid orbits with a genetic-based algorithm

Vachier

Berthier

Marchis

2012

A&A

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“…the suggestion that the Trojan asteroids of Neptune might have formed in situ and be the youngest accreted objects in the solar system (Chiang & Lithwick 2005). But you are also going to be told that (87) Silvia has two moons (Marchis et al 2005), for which the IAU has already OK'd the names Romulus and Remus (IAU Circ. 8582).…”

Section: Asteroidsmentioning

confidence: 99%

Astrophysics in 2005

Trimble

Aschwanden

Hansen

2006

PUBL ASTRON SOC PAC

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ABSTRACT. We bring you, as usual, the Sun and Moon and stars, plus some galaxies and a new section on astrobiology. Some highlights are short (the newly identified class of gamma-ray bursts, and the Deep Impact on Comet 9P/Tempel 1), some long (the age of the universe, which will be found to have the Earth at its center), and a few metonymic, for instance the term "down-sizing" to describe the evolution of star formation rates with redshift.

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“…The resulting images of merging galaxies have been published in Melbourne et al (2005). Solar system engineering science projects have included measuring the system mass of binary Trojan asteroids (Marchis et al 2005) and Kuiper Belt objects (Brown et al 2005). Additional projects have included a search for brown dwarf binaries, and images of the Andromeda galaxy shown in Figure 10.…”

Section: Science Demonstration Programmentioning

confidence: 99%

The W. M. Keck Observatory Laser Guide Star Adaptive Optics System: Overview

Wizinowich

Mignant

Bouchez

et al. 2006

PUBL ASTRON SOC PAC

424

198

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ABSTRACT. The Keck Observatory began science observations with a laser guide star adaptive optics system, the first such system on an 8-10 m class telescope, in late 2004. This new capability greatly extends the scientific potential of the Keck II Telescope, allowing near-diffraction-limited observations in the near-infrared using natural guide stars as faint as 19th magnitude. This paper describes the conceptual approach and technical implementation followed for this system, including lessons learned, and provides an overview of the early science capabilities.

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Discovery of the triple asteroidal system 87 Sylvia

Cited by 105 publications

References 18 publications

Determination of binary asteroid orbits with a genetic-based algorithm

Determination of binary asteroid orbits with a genetic-based algorithm

Astrophysics in 2005

The W. M. Keck Observatory Laser Guide Star Adaptive Optics System: Overview

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