Spacecraft n:

Thailand spacecraft n: 4

Thai micro satellite, also called TO-31 or Oscar 31

Launch data:

Designation 25396 / 98043C
Launch date10 Jul 1998
Launch site Baikonur, LC-45L
Launch vehicle  Zenit-2 (#29)
MissionRemote sensing
Sun-synchronous Earth orbit:
Perigee/Apogee 821 km sun-synchronous orbit
Inclination 110°
Period 90 minutes

Was built by Thai engineers at the University of Surrey in Britain and it will operate in a low-earth orbit to monitor forest fires and water pollution and forecast weather.

TMSAT is under funding by The Thai Micro Satellite Company Co.,Ltd.(TMSC), that is a new joint venture between Mahanakorn University of Technology (MUT) and Thai Satellite Telecommunication (TSC) of Bangkok, Thailand.


Prime contractor SSTL
Mass at launch 150 kg
Mass in orbit  
Solar array  
DC power  
Design lifetime  

TMSAT has a downlink on 436.925 MHz, uplink on 145.925 MHz, both at 9600 bps FSK

Ref: #15 - update: 27.10.04