Following the recently reported decline of the X-ray flux from the millisecond pulsar HETE J1900.1-2455 (Galloway et al. 2007, ATel #1086), we acquired images of its optical counterpart using the Wide Field Camera mounted on the 2.5m Isaac Newton Telescope at La Palma. The images were obtained on 2007 May 29 4:10-4:33 UT and May 30 3:42-4:17 UT and

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Proper motions in a sunspot group with a δ-configuration and close to the solar disk center have been studied by employing local correlation tracking techniques. The analysis is based on a more than 1 hr time series of G-band images. Radial outflows with a mean speed of 0.67 km s-1 have been detected around the spots, the well-known sunspots moats

We present ground-based B- and R-band color-magnitude diagrams (CMDs) reaching the oldest main-sequence (MS) turnoffs with good photometric accuracy for 12 fields in the Small Magellanic Cloud (SMC). Our fields, located between ~1° and ~4° from the center of the galaxy, are situated in different parts of the SMC such as the ``Wing'' area and toward

The Earth's albedo is one the least studied of the fundamental climate parameters. The albedo is a bi-directional property, and there is a high degree of anisotropy in the reflected light from a given surface. However, simultaneously observing all points on Earth from all reflecting angles is a practical impossibility. Therefore, all measurements

Characterizing multiplicity in the very low mass (VLM) domain is a topic of much current interest and fundamental importance. Here we report on a near-infrared adaptive optics imaging survey of 28 young brown dwarfs and VLM stars, 26 of which are in the Chamaeleon I star-forming region, using the ESO Very Large Telescope. Our findings in Cha I --