The GSC-I and GSC-II Databases: An Object-Oriented Approach

Gsc 2015

Improving the Absolute Astrometry of HST Data with GSC-II

We have used the new GSC-II to significantly improve the absolute astrometric accuracy of a large number of ACS datasets from the first years of ACS operations, reducing the initial levels of uncertainty (typically 1 2”, or more in some cases) to an accuracy of about 0.1 0.3”. There are typically enough GSC-II objects in the field of view of the ACS/WFC detectors to enable a robust solution to ...

Faint and peculiar objects in GAIA : results from GSC - II

The one billion objects in the GSC-II make up a formidable data set for the hunt of peculiar and rare targets such as late type stars, white dwarfs, carbon dwarfs, asteroids, variable stars, etc. Here we present a survey to search for ancient cool white dwarfs, which led to the discovery of several stars with peculiar spectral distributions and extreme physical properties. Finally, we discuss t...

An Object Oriented Approach to Astronomical Databases

The rate at which we can acquire astronomical data outstrips our ability to manipulate and interpret it using standard techniques. Future digital astronomical surveys will enter the terabyte regime. In addition, the actual data themselves will be complex, comprising images and spectra , as well as the traditional measured attributes. We describe here an implementation of a prototype object orie...

Computationally efficient and robust frequency-domain GSC

In this paper, we propose a novel adaptive beamforming algorithm with low signal distortion capability and high computational efficiency. The proposed algorithm incorporates the crosstalk-resistant adaptive noise canceller (CTRANC) in place of the usual adaptive interference canceller (AIC). Doing so, a better signal leakage estimate is provided at the adaptive interference canceller input but ...