Four-way Doppler measurements and differential VLBI will be executed by SELENE to obtain highly accurate global mapping and improve the model of lunar gravity. Two small sub-satellites: Relay Satellite (Rstar) and VLBI Radio Satellite (Vstar), which are separated from SELENE Main Orbiter, perform these selenodetic observation using Relay Satellite Transponder (RAST) and VLBI Radio Sources (VRAD). These sub-satellites have no thrusters to control orbits and attitude to yield precise measurements of orbits perturbed by gravity anomaly. Lack of thrusters, however, causes the instability of attitude that interfere the selenodesy observation. The tip off at the separation and the solar radiation pressure torque dominantly affect the attitude, hence, we evaluated them in the critical design phase of the sub-satellite development. Properties of the newly developed release mechanism were obtained by ground tests, and the satellite attitude inclination by disturbances was analyzed. These results show that the design of the sub-satellites has enough properties to produce selenodesy data.
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- Results of the Critical Design of RSAT/VRAD Mission Instruments on SELENE Sub-satellites Rstar/Vstar for Selenodesy
- Springer Berlin Heidelberg