Infrared Speckle Interferometry and Spectroscopy of Io

The goal during the last year was to continue the speckle monitoring of volcanic hot spots on Io, and to begin observations of the 1991 series of mutual events between Io and Europa. The former provide a time history of the volcanic activity, while the latter give the highest spatial resolution and the best sensitivity to faint spots. A minor component of the program is lunar occultation observations of young T Tauri stars. The occultations provide milliarcsecond resolution which let us search for circumstellar material and determine which systems are multiple.