and
, making the TYC/TPA one of the largest photometric data
bases in
the world. For about 500.000 of the brightest objects the single
observations will be published in the so called Tycho Photometric Annex B (TPA/B). This Annex will be available through the
CDS in Strasbourg, France. A subset thereof, the TPA/A, containing the
observations of about 35.000 selected objects will be published on a
CD-ROM.Such a data base needs an easy to use, powerful access tool providing data for selected objects. The Tycho Data Analysis Consortium (TDAC) is using an access tool, where the core is a collection of IDL routines controlled by an IDL-widget based GUI. The size of the TPA/C (all observations for all TYC objects) sums up to about 50 GB and it thus resides on a single host within TDAC. To provide access for all the TDAC groups there is a WWW-layer above the IDL access tool which copies some of the functionalities to a small number of HTML-form pages. The interface is currently being updated with client side image maps, JavaScript verification and Java tools to limit the network traffic and the server load. If support by the host institute is approved this interface will be opened to the WWW without restrictions at the time when the catalogues are published, i.e. in May 1997.