SYSTEM DESIGN OF JAPANESE FIRST INTERPLANETARY SPACECRAFT.

MS-T5 and PLANET-A are Japanese first and second interplanetary spacecraft. The main mission of MS-T5 is the verification of the launching capability of M-3SII rocket and the technology applied to the PLANET-A, as well as the Japanese deep space communication network. The test spacecraft MS-T5 was successfully launched from Kagoshima Space Center (KSC) on January 8, 1985, and it was renamed launched from KSC on August 19, 1985, and it was renamed SUISEI. SUISEI is headed along an interplanetary orbit for an enclunter with Halley's comet on March 4, 1986. The design of SAKIGAKE is almost same as SUISEI except for scientific instruments. Both spacecraft are cylindrical of 0. 7 m in height and 1. 4 m in diameter. The weight of SAKIGAKE and SUISEI is 138 kg and 140 kg respectively including 10 kg of initial fuel weight.