Visible and near-infrared spectra (0.5-2.4 μm) of TNOs (50000) Quaoar and 2002 TX300 taken with the Italian 3,56m "Telescopio Nazionale Galileo" are presented and analyzed in the framework of the simple one-dimensional geometrical-optics formulation by Shkuratov et al. (1999, Icarus 137, 235). The detection of deep absorption bands in the near

A-type asteroids are usually found in the main asteroid belt and their spectra are very similar to spectra of the silicate mineral olivine (Cruikshank and Hartmann 1984). The existence of olivine-rich asteroids is a result of differentiation, those being the pieces of the mantle of a larger parent body. Extraterrestrial sources of such material

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The direct access to the interior of the Sun has been possible, over the past 25 years, by successfully applying seismic techniques to detect and to characterize the whole spectrum of its oscillation eigenmodes. The unique and huge amount of observational data provided by earth-based networks and space-borne instruments, has allowed a high degree

The GTC (Gran Telescopio Canarias) employs an Acquisition and Slow Guiding Sensor based on a Marconi CCD47-20. This chip is also the core sensor for the telescope Segment Figure Sensor. A third sensor, based on a Marconi CCD39-01 implements Fast Guiding and is also used for Wavefront Sensing under continuous rotation. 1 Hz full-frame readouts and

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