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Speckle interferometry observations of asteroids at tng |
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| Authors: | A Cellino E Diolaiti D Hestroffer A Ghedina |
| Institution: | a INAF - Osservatorio Astronomico di Torino, 10025 Pino Torinese (TO), Italy b Department of Astronomy, University of Padova, 35122 Padova, Italy c INAF - Osservatorio Astronomico di Arcetri, 50125 Firenze, Italy Max-Planck-Institut für Astronomie, 69117 Heidelberg, Germany d IMCCE, UMR CNRS 8028, Observatoire de Paris, 75014 Paris, France e INAF - Osservatorio Astronomico di Torino, 10025 Pino Torinese (TO), Italy Observatoire de la Cote d’Azur, Nice, France f INAF - Telescopio Nazionale Galileo, 38700 Santa Cruz de La Palma, Tenerife. P.O. Box 565, Spain |
| Abstract: | The Speckle camera of the 3.5 m Telescopio Nazionale Galileo (TNG) has been used to measure apparent sizes and shapes of a number of main belt asteroids. The average size measurements are in a generally good agreement with the results of indirect IRAS-based radiometric techniques. The measured shapes are compared with predictions based on previously derived spin axis directions and lightcurve photometry of some of the observed objects. Also in this case the agreement is reasonable and the speckle observations allow us to discriminate in some cases between the two pole solutions usually found for each object. No clear evidence of binaries was found. The results show that the TNG speckle camera can be a powerful tool to resolve relatively large main belt asteroids and to calibrate the results of the IRAS survey. |
| Keywords: | Asteroids |
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