THEOS (satellite)

THEOS (from the English Thailand Earth Observation System ) is the first Thai satellite for remote sensing of the Earth , designed for satellite imagery of the Earth's surface in the interests of government structures in Thailand. The satellite was launched on October 1, 2008 from the Dombarovsky Cosmodrome using the Dnepr launch vehicle .

THEOS
English Th ailand E arth O bservation S ystem
Customer	Histda
Manufacturer	EADS Astrium
Tasks	Earth Remote Sensing
Satellite	Earth
Launch pad	Base Clear
Launch vehicle	Dnieper
Launch	October 1, 2008 06:37 UTC
Flight duration	10 years 11 months 8 days
NSSDC ID	2008-049A
SCN	33396
Specifications
Platform	Leostar-500-XO
Weight	Starting: 750 kg (of which 80 kg of fuel)
Dimensions	2.1 × 2.1 × 2.4 m
Power	not less than 980 W
Power supplies	Gaas
Orientation	3-hosny
The term of active existence	7 years
Elements of the orbit
Orbit type	solar synchronous
Semimajor axis	7203.3 km
Eccentricity	0
Mood	98.78 °
Circulation period	101.4 minutes
Apocenter	826 km
Pericenter	825 km
Repetition interval	26 days
Target equipment
Pan	Panchromatic telescope with SiC mirror
Ms	Multi-zone refractor
Spatial resolution	PAN : 2m MS : 15 m
Capture band	PAN : 22 km ( Nadir ) MS : 90 km (nadir)
Spectral band	PAN : 0.45-0.90 μm MS : 0.45-0.52 μm 0.53-0.60 microns 0.62-0.69 microns 0.77-0.90 microns
Transmission speed	120 Mbps
Onboard memory	51 GB

THEOS was created on the basis of the Leostar-500-XO platform by EADS Astrium. Two cameras are mounted on the satellite: panchromatic, which allows you to take pictures with a maximum resolution of 2 meters with a capture bandwidth of 22 km and multispectral with a maximum resolution of 15 meters with a capture bandwidth of 90 km. Two antennas are installed on the satellite - one S-band for controlling the satellite, the other X-band for transmitting information.

The main tasks that the satellite will solve are mapping , monitoring of agricultural activities, forestry, and the coastal zone.