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MOS 1a, 1b (Momo 1a, 1b)


MOS-1 (Marine Observation Satellite) "Momo-1" is the Japan's first Earth Observation Satellite developed applying domestic technologies as a part of Satellite Earth Observation Systems for contributing to effective utilization of Earth resources, environmental protection, etc.

MOS-1b, "Momo-1b" was launched to succeed the Momo-1.

MOS-1 was launched by N-2 launch vehicle on February 19,1987 and MOS-1b by H-1 launch vehicle followed on 7 February 1990 respectively from Tanegashima Space Center, National Space Development Agency of Japan (NASDA).

Operation of MOS-1 failed on March 31,1995 and at the end of April 25 1996. MOS-1b operation is going to be terminated due to degradation of batteries.

MOS-series satellites orbit the Earth at an altitude of 909 km in 103 minutes always facing their observation equipment to the Earth. Each of them carries three sensors, Multispectral Electronic Self-Scanning Radiometer (MESSR), Visible and Thermal Infrared Radiometer (VTIR), and Microwave Scanning Radiometer (MSR), their observation data are acquired by overseas ground stations as well as our domestic data acquisition stations and utilized extensively.

Nation: Japan
Type / Application: Earth Observation
Operator: NASDA
Equipment: MESSR, VTIR, MSR
Power: Deployable solar array, batteries
Satellite COSPAR Date LS Launch Vehicle Remarks
MOS 1a (Momo 1a) 1987-018A 19.02.1987 Ta LP-N N-2
MOS 1b (Momo 1b) 1990-013A 07.02.1990 Ta LP-N H-1 (9 SO) with DEBUT, JAS 1b

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