MOS-1 (satellite)

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.

Marine Observation Satellite-1

Names	MOS-1, Momo-1
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
Instruments MESSR Multispectral Electronic Self-Scanning Radiometer[6] VTIR Visible and Thermal Infrared Radiometer MSR Microwave Scanning Radiometer DCS Data Collection System

Instruments

It has four instruments:

• "Multi-Spectral Electronic Self-Scanning Radiometer (MESSR)" which offers 50 m resolution in two visible and two infra-red spectral 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 measures microwave emission in the 23 GHz and 31 GHz bands.
• "Data Collection System (DCS)" which is an experimental transponder.^[7]