PicSat is a French nano-satellite, a CubeSat made of 3 units (3U), designed to measure the transit of the planet Beta Pictoris b in front of its star Beta Pictoris. PicSat was designed and built by a small team of scientists and engineers led by Dr. Sylvestre Lacour, astrophysicist and instrumentalist at the High Angular Resolution in Astrophysics group of the LESIA laboratory at the Paris Observatory / PSL Research University / CNRS. The satellite was launched on January 12, 2018. It operated for more than 10 weeks, then fell silent on March 20, 2018.