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XI 4, 5 (CO 57, 58, CubeSat-OSCAR 57, 58)


The code name of ISSL's CubeSat is "XI" (X-factor Investigator). This derives from its cubic shape (XI means domino in Japanese).

The XI mission is on-orbit verifications of the technology necessary for super-small satellite system. Acquiring indispensable technology on spacecraft, such as communication, power and electronics, it will establish the development methodology of the small satellite. And by extensively using commercial-off-the-shell components, the total development cost will be drastically reduced and a database on the space-use of the COTS parts will be built. A number of Cubesat-XI prototypes have been built - the fourth is the first flight model with the fifth being its backup.

Nation: Japan
Type / Application: Technology
Operator: University of Tokyo
Contractors: University of Tokyo
Configuration: CubeSat (1U)
Propulsion: None
Power: Solar cells, batteries
Mass: 1 kg
Orbit: 822 km × 828 km, 98.73 (#4); 682 km × 708 km, 98.18 (#5)
Satellite COSPAR Date LS Launch Vehicle Remarks
XI 1 (XI-I) - not launched
XI 2 (XI-II) - not launched
XI 3 (XI-III) - not launched
XI 4 (XI-IV, CO 57, CubeSat-OSCAR 57) 2003-031J 30.06.2003 Pl LC-133/3 Rokot-KM with MOST, MIMOSA, CanX 1, AAU-Cubesat, DTUSat, CUTE 1, QuakeSat, Monitor-E GVM
XI 5 (XI-V, CO 58, CubeSat-OSCAR 58) 2005-043F 27.10.2005 Pl LC-132/1 Kosmos-3M with TopSat 1, China-DMC+4, Mozhayets 5, Sina 1, SSETI-Express, UWE 1, Ncube 2, Rubin 5-ASOLANT


  • University of Tokyo Website

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