Abstract
A micro/nano satellite "TSUBAME", which is an earth and astronomical observation technology demonstration satellite, has been mainly developed by Matunaga laboratory at ISAS/JAXA and Tokyo Tech. Now, TSUBAME development team is developing the flight model of TSUBAME aiming at the launch in this fiscal year, and Attitude Determination and Control System (ADCS) of TSUBAME is developing an attitude simulator for verifying attitude determination and control performance of TSUBAME and reliability of its embedded software. In this paper, an overview of the developing attitude simulator and its ground verification are described.