2004BaltA..13..510C

The mid-infrared interferometric instrument MIDI has performed its first scientific observations on the Very Large Telescope Interferometer (VLTI) in June 2003. It allows interferometric observations over the 8-13 µm wavelength range, with a spatial resolution up to 20 milliarcsec, a spectral resolution of 30 and 250, and an expected point source sensitivity of N = 4 mag or 1 Jy for self-fringe tracking, which is the only observing mode during the first months of operation. We describe briefly the layout of the instrument and present the first status of the MIDI observations of Young Stellar Objects.