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Names | MOS-1, Momo-1 | ||||||||||
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Mission type | Earth observation | ||||||||||
Operator | NASDA | ||||||||||
COSPAR ID | 1987-018A | ||||||||||
SATCAT no. | 17527 | ||||||||||
Mission duration | Planned: 2 years Final: 8 years, 9 months, 9 days | ||||||||||
Spacecraft properties | |||||||||||
Manufacturer | NEC[1] | ||||||||||
Launch mass | 750 kg [2] | ||||||||||
Start of mission | |||||||||||
Launch date | 19 February 1987 01:23:00 UTC [3] | ||||||||||
Rocket | N-II (N-16F) [4] | ||||||||||
Launch site | Tanegashima LC-N | ||||||||||
Contractor | NASDA | ||||||||||
End of mission | |||||||||||
Disposal | Decommissioned | ||||||||||
Deactivated | 29 November 1995 | ||||||||||
Orbital parameters | |||||||||||
Reference system | Geocentric | ||||||||||
Regime | Sun-synchronous | ||||||||||
Perigee altitude | 909 km [5] | ||||||||||
Apogee altitude | 909 km | ||||||||||
Inclination | 99.1° | ||||||||||
Period | 103.2 minutes | ||||||||||
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Marine Observation Satellite-1 (MOS-1), also known as Momo-1, was Japan's first Earth observation satellite. It was launched on 19 February 1987 on a N-II rocket from Tanegashima Space Center and was operated by the National Space Development Agency of Japan (NASDA). It is in a polar orbit at roughly 900 km altitude, but was decommissioned on 29 November 1995.
It has four instruments: