We present results on the X-ray spectral analysis of the XMM-Newton deep surveys on the Lockman Hole and Chandra Deep Field South fields. Using the results of optical identification of sources in both fields, we have derived statistical properties of the faint X-ray population. Using the subsample with known redshifts we examine evidences of

We present optical photometry of the Carina Dwarf Spheroidal (dSph) Galaxy. Data have been collected with CCD mosaic cameras available at the 2.2m ESO/MPI and at the 4m CTIO Blanco telescopes. Our current (V,B-V) Color-Magnitude diagram (CMD) confirms the occurrence of an old (˜ 11 Gyr) and an intermediate-age (˜ 5 Gyr ) population. Furthermore, we

Asteroid (4) Vesta is known as the unique large object of the main belt showing a basaltic crust and is a target of the NASA Dawn Mission. Vesta composition is also similar to that of basaltic achondrite meteorites, specifically the Eucrites, Diogenites and Howardites (HED). On the other hand, in recent taxonomies, asteroids showing a spectrum

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SAX J1747.0-2853 is an X-ray transient which exhibited several outbursts between 1998 and 2001 and most probably in 1976. The outburst of 2000 was the longest and brightest. We have analyzed X-ray data sets that focus on times around the 2000 outburst and were obtained with l BeppoSAX, XMM-Newton and l RXTE.

Asteroids in cometary orbits can be defined as minor planets that do not present cometary activity and has orbits with Tisserand parameter T 3 (typical of cometary orbits). The nature and origin of this population is still controversial. Recent dynamical studies claim for a cometary origin (comets that become dormant or dead comets by the growth