Asteroid (2579) Spartacus is a small V-type object located in the inner main belt (the main delivery region for meteorites). It shows spectral characteristics different from typical values for Vestoids, which may indicate origin deeper within Vesta then other V-types or a different parent body. We determine physical and dynamical properties of

Se propone realizar un estudio homogéneo de la historia de formación estelar (edad y metalicidad de las estrellas de una galaxia desde el instante de su formación, HFE) y estructura espacial de una selección de galaxias enanas ultra-débiles del Grupo Local: Bootes I, Canes Venatici II y Leo IV a partir de datos fotométricos de banda ancha (V,I) del

We report the detection of the radio afterglow of a long gamma-ray burst (GRB) 111005A at 5-345 GHz, including very long baseline interferometry observations with a positional error of 0.2 mas. The afterglow position is coincident with the disc of a galaxy ESO 58049 at z = 0.01326 (˜1″ from its centre), which makes GRB 111005A the second-closest

We present a new measurement of the systemic proper motion of the Small Magellanic Cloud (SMC), based on an expanded set of 30 fields containing background quasars and spanning a ∼3 year baseline, using the Hubble Space Telescope (HST) Wide Field Camera 3. Combining this data with our previous five HST fields, and an additional eight measurements

We present an optical spectroscopic study of the black hole X-ray transient V4641 Sgr (=SAX J1819.3-2525) covering the 1999, 2002, and 2004 outbursts. The spectra were taken over 22 different epochs during the low-luminosity phases that follow the sharp and bright outburst peaks displayed by the system. The data reveal the frequent presence of wind