MDS-1

Mission Demonstration Satellite 1 (MDS-1) or Tsubasa (COSPAR 2002-003A, SATCAT 27367) was a Japanese technology test mission. It was launched by the second H-2A on February 4, 2002 from the Tanegashima Space Center. After the launch, MDS-1 was renamed Tsubasa, meaning wings in Japanese.[1] Tsubasa was placed in a geostationary transfer orbit. It ended its operational phase on February 26, 2003.[2] A similar mission, MDS-2, was cancelled.[3]

The purpose of the mission was to test the performance of commercial off-the-shelf components, including solar batteries, semiconductors and computers.[1][2]. MDS-1 also carried instrumentation to observe how changes in the environment as the satellite passed through the Van Allen radiation belts affected the performance of each component. Among these instruments were a dosimeter using radiation-sensitive field effect transistors,[4] a magnetometer, and a device for tracking heavy ions.[5] During the mission, MDS-1 tracked the occurrence of single event upsets, finding the majority occurred while passing the inner belt during solar maximum and were likely caused by high energy protons.[6] The whole weight of the satellite was 480 kg.[1]

References
  1. "MDS-1 – NSSDC Master Catalog". nssdc.gsfc.nasa.gov. NSSDC. Retrieved 7 January 2019.
  2. "JAXA | Mission Demonstration test Satellite-1 "TSUBASA" (MDS-1)". JAXA | Japan Aerospace Exploration Agency. JAXA. Retrieved 7 January 2019.
  3. "MDS 2". space.skyrocket.de. Gunter's Space Page. Retrieved 7 January 2019.
  4. Kimoto, Y.; Koshiishi, H.; Matsumoto, H.; Goka, T. (December 2003). "Total dose orbital data by dosimeter onboard tsubasa (mds-1) satellite". IEEE Transactions on Nuclear Science. 50 (6): 2301–2306. doi:10.1109/TNS.2003.821399.
  5. Koshiishi, H.; Matsumoto, H.; Kimoto, Y.; Liu, H.; Goka, T. (2002). "Space Environment Data Acquisition Equipment Board Mission Demonstration Test Satellite-1". COSPAR Colloqui Series. 14: 369–371. doi:10.1016/S0964-2749(02)80184-6.
  6. Koshiishi, H.; Matsumoto, H.; Goka, T. (November 2008). "Single-event upset in geostationary transfer orbit during solar-activity maximum period measured by the Tsubasa satellite". Advances in Space Research. 42 (9): 1500–1503. doi:10.1016/j.asr.2007.11.026.


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