We present the first strong-lensing study of the mass distribution in the cluster MS 2053-04 based on HST archive data. This massive, X-ray luminous cluster has a redshift z=0.583 and is composed of two structures that are gravitationally bound to each other. The cluster has one multiply imaged system composed of a double gravitational arc. We have

We present a detailed study on the kinematics of metal-rich stars with and without planets, and their relation with the Hyades, Sirius and Hercules dynamical streams in the solar neighbourhood. We compare the kinematic behaviour of known planet-host stars to the remaining targets belonging to the CORALIE volume-limited sample, in particular to its

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Recent results suggest that there is a group of trans-Neptunian objects (TNOs), 2003 EL61 being the biggest member, with similar dynamical and physical characteristics (Brown et al. 2007, Pinilla-Alonso et al. 2007). All these objects are concentrated in a narrow region of the orbital parameters space (41.6 a 43.6 AU, 25.8 i 28.2 deg, 0.10 e

The Isaac Newton Telescope H-alpha survey (IPHAS) of the northern galactic plane is near completion. The photometric (H-alpha, R, I) catalogue and the mosaic images database have been searched for new Planetary Nebulae. We present the results for the RA=18 to 20 hr region, the first analyzed so far. More than 250 PNe candidates are discovered

The COROT space mission will monitor several target fields for up to 150 days to perform asteroseismology and to search for extrasolar planets by photometric transits. Variable stars in the target fields are important objects for additional scientific studies but can also disturb the search for planetary transits. A variability characterization of