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2 results on '"Cigna, Massimo"'

1. CCD and photon-counting photometric observations of asteroids carried out at Padova and Catania observatories

Author

Gandolfi, Davide, Cigna, Massimo, Fulvio, Daniele, and Blanco, Carlo

Subjects
Astrophysics
Abstract

We present the results of observational campaigns of asteroids performed at Asiago Station of Padova Astronomical Observatory and at M.G. Fracastoro Station of Catania Astrophysical Observatory, as part of the large research programme on Solar System minor bodies undertaken since 1979 at the Physics and Astronomy Department of Catania University. Photometric observations of six Main-Belt asteroids (27 Euterpe, 173 Ino, 182 Elsa, 539 Pamina, 849 Ara, and 984 Gretia), one Hungaria (1727 Mette), and two Near-Earth Objects (3199 Nefertiti and 2004 UE) are reported. The first determination of the synodic rotational period of 2004 UE was obtained. For 182 Elsa and 1727 Mette the derived synodic period of 80.23+/-0.08 h and 2.981+/-0.001 h, respectively, represents a significant improvement on the previously published values. For 182 Elsa the first determination of the H-G magnitude relation is also presented., Comment: 19 pages, 11 figures, accepted for publication in Planetary and Space Science

Published
2008
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2. MIDI observations of 1459 Magnya: first attempt of interferometric observations of asteroids with the VLTI

Author

Delbo, Marco, Gai, Mario, Lattanzi, Mario G., Ligori, Sebastiano, Loreggia, Davide, Saba, Laura, Cellino, Alberto, Gandolfi, Davide, Licchelli, Domenico, Blanco, Carlo, Cigna, Massimo, and Wittkowski, Markus

Subjects
Asteroids -- Observations, Asteroids -- Properties, Infrared astronomy -- Research, Photometry -- Research, Photometry -- Usage, Astronomy, Earth sciences
Abstract

The Very Large Telescope Interferometer (VLTI) of the European Southern Observatory (ESO) can be used to obtain direct determination of the sizes and the albedos of asteroids. We present results of the first attempt to carry out interferometric observations of asteroids with the Mid Infrared Interferometric Instrument (MIDI) at the VLTI. Our target was 1459 Magnya. This is the only V-type asteroid known to exist in the outer main-belt, and its IRAS-albedo turns out to be rather low for an object of this taxonomic class. Interferometric fringes were not detected, very likely due to the fact that the flux emitted by the asteroid was lower than expected and below the MIDI threshold for fringe detection. However, by fitting the Standard Thermal Model to the N-band infrared flux measured by MIDI in photometric mode and to the visible absolute magnitude, obtained from quasi-simultaneous B- and V-band photometric observations, we have derived a geometric visible albedo of 0.37 [+ or -] 0.06 and an effective diameter of 17 [+ or -] 1 km. This new estimate of the albedo differs from that previously obtained by IRAS and is more consistent with the V-type taxonomic classification of 1459 Magnya. Keywords: Asteroids; Infrared observations; Photometry; Instrumentation

Published
2006

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