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Astronomical Data Analysis Software and Systems VII
ASP Conference Series, Vol. 145, 1998
Editors: R. Albrecht, R. N. Hook and H. A. Bushouse

Cover Illustration:

This figure, pertaining to the paper by Markus Dolensky, Alberto Micol, Benoit Pirenne and Michael Rosa, shows the ``HST Jitter Ball" visualized by a Java applet. The deviations of the HST line of sight from the nominal position during a 1000 second WFPC2 exposure are plotted on a scale of milliarcseconds. HST jitter information is of obvious importance for assessing the quality of an individual observation. It has been found that the center of gravity of the jitter ball moves on a subpixel scale between re-visits of the same target. This information can be used to combine images in an optimal way and with minimum loss of resolution using the ``drizzling" technique described at the last ADASS and used for combining the images of the Hubble Deep Field. Another application of drizzling is given in the paper by Hook et al.

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