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The Hipparcos catalogue
The principal observational characteristics of the Hipparcos Catalogue, and a summary of its main astrometric and photometric properties, are presented. Median astrometric standard errors (inExpand
Ground-based detection of sodium in the transmission spectrum of exoplanet HD209458b
Context. The first detection of an atmosphere around an extrasolar planet was presented by Charbonneau and collaborators in 2002. In the optical transmission spectrum of the transiting exoplanet HDExpand
Exoplanet observations promise one day to unveil the presence of extraterrestrial life. Atmospheric compounds in strong chemical disequilibrium would point to large-scale biological activity just asExpand
An all-sky set of (B)-V-R photometric calibrators for Schmidt surveys. GSPC2.1: First release
We publish 622 CCD photometric sequences in the Johnson-Kron-Cousins standard system, distributed both in the northern and southern hemispheres, useful for the calibration of photographic photometryExpand
In-orbit performance of the Hipparcos astrometry satellite
Launched in August 1989 into a geostationary transfer orbit, the Hipparcos astrometry satellite failed to reach its intended geostationary orbit through the failure of its apogee boost motor. PresentExpand
Towards High-Precision Ground-Based Astrometry: Differential Delay Lines for PRIMA@VLTI
Note: Prj_DDL Reference LA-CONF-2005-011 Record created on 2005-04-10, modified on 2017-05-10
Westerbork Surveys of Radio Sources at 610 and 1415 MHz
The Westerbork Synthesis Radio Telescope (WSRT) has now been used to make source surveys at frequencies of 610 and 1415 MHz. This paper summarizes the results concerning source counts andExpand
A proper motion study of the globular cluster w Centauri
A proper motion study is presented of the globular clusterω Centauri. Based on 100 plates obtained with the YaleColumbia 66 cm (26 inch) refractor, and ranging in epoch from 1931 till 1935 and 1978Expand