Published online by Cambridge University Press: 14 August 2015
The paper describes the high-resolution stellar UV-spectrometer, experiment S 59 for ESRO TD-1 A satellite. The experiment utilizes the orbit and attitude control characteristics of the TD-1 A to obtain spectra of about 1 Å resolution from a few hundred bright early type stars with an instrument of moderate size. Attitude control of this large three-axis stabilized spacecraft is such that observing-instruments can search the sky along ecliptic meridians which precess by 360°/annum so that complete sky coverage is obtained in half a year.