 Astrid 1 on January 24, 1995 and Astrid 2 on December 10, 1998.Sweden's first microsatellite was piggybacked with the launch of Tsikada, a Russian navigation satellite and FAISAT, a United States communications satellite.It carried an Energetic Neutral Atom imager called PIPPI (Prelude in Planetary Particle Imaging), an Electron Spectrometer called EMIL (Electron Measurements - In-situ and Lightweight) and two UV imagers called MIO (Miniature Imaging Optics), one for imaging the Earth's aurora and one for observing Lyman alpha-emission from the Earth's geocorona.