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Mission Demonstration Satellite 1 "Tsubasa" (MDS-1
) was a Japanese technology test mission. Its aim was to test commercial off the shelf components in space, especially in the radiation belt. The whole weight of the satellite was 475 kg.
It was launched by the second H-2A on February 4, 2002. Tsubusa got retired on February 26, 2003. MDS-2 was cancelled because of budget reasons.