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THEOS (Thaichote)

THEOS [Astrium]

THEOS (THai Earth Observation System), also known as Thaichote, will be fully owned and operated by the Thai Ministry of Science and Technology's Space Agency (GISTDA) and will provide Thailand with worldwide geo-referenced image products and image processing capabilities for applications in cartography, land use, agricultural monitoring, forestry management, coastal zone monitoring and flood risk management. THEOS will provide access to any part of Thailand in less than 2 days.

The THEOS contract includes the production and launch of one optical satellite, as well as the development of the ground segment necessary to operate and control the satellite directly from Thailand. This is naturally accompanied by state of the art facilities for image archiving and processing. The THEOS satellite is based on the new generation of EADS Astrium Optical Earth Observation high performance satellites, the AstroSat product line, and benefits from EADS Astrium's extensive experience in this field which started with the SPOT and METOP satellites.

As part of the THEOS contract, Thai engineers will join the EADS Astrium development team and will attend intensive space programme training. This cooperation contract paves the way for further development of GISTDA and space activities in Thailand.

The THEOS satellite payload features both high resolution in panchromatic mode and wide field of view in multispectral mode and has been tailored to Thailand's specific needs with a worldwide imaging capability. It was to be launched mid 2007 on a sun synchronous orbit at an altitude of about 820 km, but was delayed to October 2008 due to ongoing disputes over the launch vehicle drop zones.

THEOS was booked originally for a Rokot-KM launch, but was moved to a Dnepr due to the limited availability of Rokot in the required time period.

Nation: Thailand
Type / Application: Earth Observing
Operator: GISTDA
Contractors: Astrium
Equipment: 2 m resolution black-and-white imager, 15 m resolution panchromatic imager
Configuration: Leostar-500-XO
Propulsion: Hydrazine thrusters
Power: Deployable fixed solar array, batteries
Mass: 750 kg
Orbit: 672 km × 692 km, 98.80
Satellite COSPAR Date LS Launch Vehicle Remarks
THEOS (Thaichote) 2008-049A 01.10.2008 Do LC-370/13 Dnepr


  • Astrium Website