Marine Observation Satellite-1

Names	MOS-1, Momo-1
Mission type	Earth observation
Operator	NASDA
COSPAR ID	1987-018A
SATCATno.	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
Instruments MESSR Multispectral Electronic Self-Scanning Radiometer[6] VTIR Visible and Thermal Infrared Radiometer MSR Microwave Scanning Radiometer DCS Data Collection System

Marine Observation Satellite-1 (MOS-1), also known asMomo-1, wasJapan's firstEarth observation satellite. It was launched on 19 February 1987 on aN-II rocket fromTanegashima Space Center and was operated by theNational Space Development Agency of Japan (NASDA). It is in apolar orbit at roughly 900 km altitude, but was decommissioned on 29 November 1995.

It has four instruments:

• "Multi-Spectral Electronic Self-Scanning Radiometer (MESSR)" which offers 50 m resolution in two visible and two infra-redspectral bands over two 100 km swathes.
• "Visible and Thermal Infrared Radiometer (VTIR)" which has a much lower resolution in one visible and three infrared bands over a 1,500 km swathe.
• "Micro Scanning Radiometer (MSR)" which measuresmicrowave emission in the 23 GHz and 31 GHz bands.
• "Data Collection System (DCS)" which is an experimental transponder.^[7]

• MOS-1 site by JAXA

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