MOS-1 (satellite)

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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 (1,650 lb)
Start of mission
Launch date 19 February 1987, 01:23 (1987-02-19UTC01:23) UTC[2]
Rocket N-II N-16[3]
Launch site Tanegashima LC-N[3]
Contractor NASDA
End of mission
Disposal Decommissioned
Deactivated 29 November 1995 (1995-11-30)[1]
Orbital parameters
Reference system Geocentric
Regime Sun-synchronous
Perigee 909 km (565 mi)
Apogee 909 km (565 mi)
Inclination 99.1°
Period 103.2 minutes
Epoch 18 February 1987, 19:00:00 UTC[2]

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.

It has three instruments: "Multi-Spectral Electronic Self-Scanning Radiometer (MESSR)" which offers 50m 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 IR bands over a 1500 km swathe; "Micro Scanning Radiometer (MSR)" which measures microwave emission in the 23 GHz and 31 GHz bands.

Its NORAD ID is 17527; it is in a polar orbit at roughly 900 km altitude, but has not been active since November 1995.


  1. ^ a b Ninomiya, Keiken (2005). Nebylov, Alexander, ed. Automatic Control in Aerospace 2004. Proceedings of the 16th IFAC Symposium, Volume 1. Elsevier. p. 199. ISBN 0-08-044013-4. 
  2. ^ a b "MOS 1: Orbit". National Space Science Data Center. NASA. Retrieved 29 December 2016. 
  3. ^ a b "MOS 1a, 1b (Momo 1a, 1b)". Gunter's Space Page. 9 June 2016. Retrieved 29 December 2016. 

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