Discovery of a moon orbiting the asteroid 45 Eugenia

W. J. Merline, Laird M Close, C. Dumas, C. R. Chapman, F. Roddier, F. Ménard, D. C. Slater, G. Duvert, C. Shelton, T. Morgan

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

Evidence for asteroidal satellites (moons) had been sought for decades, because the relative frequency of such satellites will bear on the collisional history of the asteroid belt and the Solar System, yet only one has been detected unambiguously. Here we report the discovery of a satellite of the asteroid 45 Eugenia, using an adaptive optics system on a ground-based telescope. The satellite has a diameter of about 13 km, and an orbital period of about 4.7 days with a separation of 1,190 km from Eugenia. Using a previously determined diameter for Eugenia, we estimate that its bulk density is about 1.2 g cm, which is similar to that of the C-type asteroid Mathilde. This implies that Eugenia, also a low-albedo C-type asteroid, may be a rubble pile, or composed of primitive, icy materials of low bulk density.

Original languageEnglish (US)
Pages (from-to)565-568
Number of pages4
JournalNature
Volume401
Issue number6753
DOIs
StatePublished - Oct 7 1999
Externally publishedYes

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natural satellites
asteroids
asteroid belts
piles
bears
albedo
adaptive optics
solar system
histories
telescopes
orbitals
estimates

ASJC Scopus subject areas

  • General

Cite this

Merline, W. J., Close, L. M., Dumas, C., Chapman, C. R., Roddier, F., Ménard, F., ... Morgan, T. (1999). Discovery of a moon orbiting the asteroid 45 Eugenia. Nature, 401(6753), 565-568. https://doi.org/10.1038/44089

Discovery of a moon orbiting the asteroid 45 Eugenia. / Merline, W. J.; Close, Laird M; Dumas, C.; Chapman, C. R.; Roddier, F.; Ménard, F.; Slater, D. C.; Duvert, G.; Shelton, C.; Morgan, T.

In: Nature, Vol. 401, No. 6753, 07.10.1999, p. 565-568.

Research output: Contribution to journalArticle

Merline, WJ, Close, LM, Dumas, C, Chapman, CR, Roddier, F, Ménard, F, Slater, DC, Duvert, G, Shelton, C & Morgan, T 1999, 'Discovery of a moon orbiting the asteroid 45 Eugenia', Nature, vol. 401, no. 6753, pp. 565-568. https://doi.org/10.1038/44089
Merline WJ, Close LM, Dumas C, Chapman CR, Roddier F, Ménard F et al. Discovery of a moon orbiting the asteroid 45 Eugenia. Nature. 1999 Oct 7;401(6753):565-568. https://doi.org/10.1038/44089
Merline, W. J. ; Close, Laird M ; Dumas, C. ; Chapman, C. R. ; Roddier, F. ; Ménard, F. ; Slater, D. C. ; Duvert, G. ; Shelton, C. ; Morgan, T. / Discovery of a moon orbiting the asteroid 45 Eugenia. In: Nature. 1999 ; Vol. 401, No. 6753. pp. 565-568.
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