TMSAT

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TMSAT (Thai-Paht-1)
Type: Earth observation and amateur radio satellite
Country: ThailandThailand Thailand
COSPAR-ID : 1998-043C
Mission dates
Dimensions: 55 kg
Begin: July 10, 1998
Starting place: Baikonur
Launcher: Zenith-2
Status: Inactive
Orbit data
Rotation time : 101.3 min
Orbit inclination : 98.8 °
Apogee height :  817 km
Perigee height :  845 km

TMSAT (also Thai-Paht-1 , OSCAR 31 or TMSAT-OSCAR 31 ) is a Thai experimental earth observation and amateur radio satellite for packet radio . It was developed at Mahanakorn University of Technology and built in collaboration with Surrey Satellite Technology (SSTL).

construction

The 55 kg heavy TMSAT is based on the SSTL-70 satellite bus from SSTL. It is powered by solar cells that are attached to four sides of the satellite structure. TMSAT is gravitation stabilized by means of an extendable 6.2 m long boom so that the cameras are aligned with the nadir with less than 1.5 ° deviation .

The satellite carries three experimental payloads:

  • An earth observation payload with multispectral cameras that allow recordings with a ground resolution of 98 m, a black and white wide-angle camera and a video camera. The multispectral camera system operates in three spectral ranges (green, red and near-infrared ) in order to be able to obtain information about the condition of the vegetation from the recordings.
  • A GPS receiver for autonomous position determination in orbit
  • A digital communication payload consisting of a bulletin board that enabled data to be exchanged in a partial route . The uplink is in the 2 m band and the downlink in the 70 cm band .

Mission history

The satellite was launched on July 10, 1998 as a secondary payload with a Zenit-2 rocket in the Baikonur spaceport and placed in a sun-synchronous orbit . Its COSPAR designation is 1998-043C.

literature

  • Steve Ford: New Thai and Israeli microsats in orbit. In: QST, October 1998, 100.

Web links

Individual evidence

  1. ↑ a b c d Thai-Paht (TMSat) Mission Page from SSTL. SSTL, archived from the original on August 14, 2017 ; accessed on October 18, 2013 (English).
  2. ↑ Chris Jackson: TMSAT-1 Update. amsat.org, August 7, 1998, accessed October 18, 2013 .
  3. ↑ a b c d TMSAT in the NSSDCA Master Catalog , accessed on October 18, 2013 (English).
  4. ↑ Website at AMSAT ( Memento from October 22, 2011 in the Internet Archive ) (archive version)
  5. ↑ Chris Jackson: TMSAT-1 Update. amsat.org, September 10, 1998, accessed October 18, 2013 .