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Astron. Astrophys. 354, 315-320 (2000)


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Speckle interferometry measurements of the asteroids 10-Hygiea and 15-Eunomia

R. Ragazzoni 1, A. Baruffolo 1, E. Marchetti 2, A. Ghedina 2, J. Farinato 3 and T. Niero 4

1 Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
2 Centro Galileo Galilei, Apartado 565, 38700 Santa Cruz de la Palma, Spain
3 European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85386 Garching bei München, Germany
4 Stazione Astronomica di Cagliari, Loc. Poggio dei Pini, Strada 54, 09012 Capoterra, Italy

Received 1 June 1999 / Accepted 19 November 1999

Abstract

Speckle interferometry measurements of the asteroids 10-Hygiea and 15-Eunomia have been obtained with the speckle facility aboard the AdOpt@TNG module, permanently mounted on the 3.58m TNG telescope in Canary Islands. Direct angular diameter measurements and estimates of the apparent ellipticity are given allowing to derive the density of these asteroids, combining our data with published results. Our data for 15-Eunomia, moreover, are compatible with both an egg-shaped and a double, in contact, asteroid model. A brief discussion of both models is here presented.

Key words: methods: data analysis – techniques: interferometric – minor planets, asteroids

Send offprint requests to: R. Ragazzoni

© European Southern Observatory (ESO) 2000

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