A low resolution map of Europa from four occultations by Io

Abstract Analysis of three occultations of JII (Europa) by JI (Io) has resulted in a preliminary reflectivity map of JII for the hemisphere centered on longitude 324°, a measurement of 1483±20 km for the radius of JII, estimates of the event impact parameters, determination of the mid event times, and a visual geometric albedo, pν = 0.74, for JII. A fourth occultation light curve was used after derivation of the results to confirm their validity.