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CubeSats are emerging as low-cost tools to perform astronomy, exoplanetsearches and earth observation. These satellites can target an object forscience observation for weeks on end. This is typically not possible on largermissions where usage time is shared. The problem of designing an attitudecontrol system for CubeSat telescopes is very challenging because currentchoice of actuators such as reaction-wheels and magnetorquers can induce jitteron the spacecraft due to moving mechanical parts and due to externaldisturbances. These telescopes may contain cryo-pumps and servos that introduceadditional vibrations. A better solution is required. In our paper, we analyzethe feasibility of utilizing solar radiation pressure (SRP) and radiometricforce to achieve precise attitude control. Our studies show radiometricactuators to be a viable method to achieve precise pointing. The device uses 8thin vanes of different temperatures placed in a near-vacuum chamber. Thesechambers contain trace quantities of lightweight, inert gasses like argon. Thetemperature gradient across the vanes causes the gas molecules to strike thevanes differently and thus inducing a force. By controlling these forces, it'spossible to produce a torque to precisely point or spin a spacecraft. Wepresent a conceptual design of a CubeSat that is equipped with these actuators.We then analyze the potential slew maneuver and slew rates possible with theseactuators by simulating their performance. Our analytical and simulationresults point towards a promising pathway for laboratory testing of thistechnology and demonstration of this technology in space.

Precise Pointing of Cubesat Telescopes: Comparison Between Heat and Light Induced Attitude Control Methods