Abstract. The Ninth Catalogue of Spectroscopic Binary Orbits (http://sb9.astro.ulb.ac.be) continues the series of compilations of spectroscopic orbits carried out over the past 35 years by Batten and collaborators. As of 2004 May 1st, the new Catalogue holds orbits for 2386 systems. Some essential differences between this catalogue and its predecessors are outlined and three straightforward applications are presented: (1) completeness assessment: period distribution of SB1s and SB2s; (2) shortest periods across the H-R diagram; (3) period-eccentricity relation.

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Spectroscopic observations of the eclipsing binary AD Her have been obtained at Victoria from 1972 to 1977 at dispersions of 15 Â mm -1 and 30 Á mm -1 . From them the following orbital elements have been derived: P = 9.76658 days (assumed), T = JD2441536.44 ± 0.26,