|Mission type||Earth observation|
|Mission duration||Planned: 2 years
Final: 8 years, 9 months, 9 days
|Launch mass||750 kg (1,650 lb)|
|Start of mission|
|Launch date||19 February 1987, 01:23UTC|
|Launch site||Tanegashima LC-N|
|End of mission|
|Deactivated||29 November 1995|
|Perigee||909 km (565 mi)|
|Apogee||909 km (565 mi)|
|Epoch||18 February 1987, 19:00:00 UTC|
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.
- 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.
- "MOS 1: Orbit". National Space Science Data Center. NASA. Retrieved 29 December 2016.
- "MOS 1a, 1b (Momo 1a, 1b)". Gunter's Space Page. 9 June 2016. Retrieved 29 December 2016.
- MOS-1 site by JAXA
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