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The Hipparcos Transit Data are a collection of partially reduced, fully
calibrated observations of (mostly) double and multiple stars obtained
with the ESA Hipparcos astrometry satellite. The data are publicly
available, as part of the CD-ROM set distributed with the Hipparcos and
Tycho Catalogues (ESA SP{1200, 1997), for about a third of the
Hipparcos Catalogue entries including all confirmed or suspected
non-single stars. The Transit Data consist of signal
modulation parameters derived from the individual transits of the
targets across the Hipparcos focal grid.
The Transit Data permit re-reduction of the satellite data
for individual objects, using arbitrarily complex object models in which
time-variable photometric as well as geometric characteristics may be
taken into account. We describe the structure and contents of the
Transit Data files and give examples of how the data can be used. Some
of the applications use standard astronomical software: Difmap or AIPS
for aperture synthesis imaging, and GaussFit for detailed model
fitting. Fortran code converting the data into formats suitable for
these application programs has been made public in order to encourage
and facilitate the use of Hipparcos Transit Data
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