HIPPARCOS (High-Precision Parallax Collecting Satellite) is an ESA satellite which was launched in August 1989 and is dedicated to the measurement (at the milliarcsecond level) of positions, trigonometric parallaxes, and proper motions for about 120,000 stars. The target list (the HIPPARCOS Input Catalog) is available from CDS or NASA-ADC as catalog I/191 or A1191, respectively (see §3.1.1. and §3.1.2.). A series of papers on the satellite performance and first results appeared in A&A258 (1992). For further information contact C. Turon (turon@mesioa.obspm.fr) or D. Morin (morin@mehipa.obspm.fr). [References: Turon et al. (1991, 1992a, 1992b).]