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PicSat is a nanosatellite developed to observe the transit of the giantplanet beta Pictoris b, expected in late 2017. Its science objectives are: theobservation of the transit of the giant planet's Hill sphere, the detection ofexocomets in the system, and the fine monitoring of the circumstellar diskinhomogeneities. To answer these objectives without exceeding the possibilitiesof a 3-unit Cubesat in terms of mass and power budget, a small but ambitious 2kg opto-mechanical payload was designed. The instrument, specifically made forhigh precision photometry, uses a 3.5 cm effective aperture telescope whichinjects the light in a single-mode optical fiber linked to an avalanchephotodiode. To ensure the stability of the light injection in the fiber, a finepointing system based on a two-axis piezoelectric actuation system, is used.This system will achieve a sub-arcsecond precision, and ensure that an overallphotometric precision of at least 200 ppm/hr can be reached.

A Compact and Lightweight Fibered Photometer for the PicSat Mission