THEOS

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THEOS
Type: Earth observation satellite
Country: ThailandThailand Thailand
Operator: GISTDA
COSPAR-ID : 2008-049A
Mission dates
Dimensions: 750 kg
Size: 2.1 m × 2.1 m × 2.4 m
Begin: October 1, 2008, 06:37 UTC
Starting place: Jasny Cosmodrome
Launcher: Dnepr
Orbit data
Rotation time : 101.4 min
Track height: 822 km
Orbit inclination : 98.7 °

THEOS (Thailand Earth Observation System) is the first national earth observation satellite of the Thai space agency GISTDA (Geoinformatics and Space Technology Development Agency). The purpose of the satellite is to record images for cartographic, agricultural and forestry as well as coastal protection and flood monitoring.

history

Thailand has been involved in other countries' earth observation programs since the 1970s. After working with providers of systems such as Landsat , Radarsat and SPOT , Thailand decided to start its own earth observation satellite. The contract with EADS Astrium SAS to develop the satellite was signed on July 19, 2004. Construction of the satellite was completed in February 2007. It was supposed to be launched from the Jasny missile base in December 2007 with the help of a Russian Dnepr missile . After several postponements, the launch took place on October 1, 2008 at 6:37 am ( UTC ). The satellite is controlled by the THEOS Control Center in Si Racha in the Chonburi Province.

technology

The satellite is equipped with a panchromatic telescope and a multispectral camera and is based on the AstroSat-500 satellite bus from EADS. It has three-axis control and can therefore take pictures in a 1000 km wide corridor along its flight path (50 ° outside the perpendicular ). With single recordings, recordings in a 1900 km wide corridor or stereo recordings of a certain area are possible.

Technical specifications

Cameras
panchromatic multispectral
resolution 2 m 15 m
Recording tape 0.45-0.9 µm Blue: 0.45-0.52 µm
Green: 0.53-0.60 µm
Red: 0.62-0.69 µm
NIR : 0.77-0.90 µm
Swath width 22 km 90 km
satellite
  • Mass: 750 kg
  • Size: 2.1m × 2.1m × 2.4m
  • Solar cell power: 980 W (EOL)
  • Orbit : Sun synchronized at an altitude of 822 km with 101.4 minutes orbital time
  • Inclination : 98.7 °
  • Re-flyover period: 26 days
  • Storage capacity: 51 GBit
  • Data transmission: Mission Data in X-Band with 120 Mbit / s transmission capacity, TT & CTT & C in S-Band
  • Control: 3-axis stabilization with star finder , gyro , GPS , magnetometer and sun sensor
  • Steering engines: hydrazine engines with 80 kg fuel supply
  • planned lifetime: at least five years

Web links

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  1. a b APRSAF: THEOS: Thailand Earth Observation System ( Memento from October 21, 2007 in the Internet Archive ) (PDF, English; 3 MB)
  2. Russia launches Thai satellite on converted missile. In: Sputnik News. RIA Novosti, October 1, 2008, accessed February 3, 2011 .
  3. THEOS (Thailand Earth Observation System) / Thaichote in ESA's eoPortal (English)