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Overview

The all-sky survey was performed in such a way that the ROSAT satellite carried out a scan along a great circle perpendicular to the current position of the Sun on the ecliptic; thus at any given time ecliptic longitudes tex2html_wrap_inline2192 were scanned. As the Sun moves along the ecliptic, the spin axis of the satellite follows and after a period of six months the whole sky was covered. During the survey orbital period and the rotation period were synchronized and ROSAT's viewing direction was controlled in such a way that no earth blockages occurred and that the zenith angle, i.e., the angle between the instantaneous pointing direction of the satellite and the local zenith, was always less than tex2html_wrap_inline2194 .



Michael Arida
Tue Jun 11 16:18:41 EDT 1996