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Stellenbosch UNiversity SATellite, also called SO-35, Oscar 35


Designation 25636 / 99008C
Launch date 23 Feb 1999
Country of origin South Africa
Mission Telecommunication, HAM
Perigee/Apogee 831/847 km
Inclination 98.7°
Launch vehicle Delta 2 #267

Micro satellite being designed, built and tested by students at the Electronic Systems Laboratory in the Department of Electrical and Electronic Engineering at Stellenbosch University. In exchange for a US National Aeronautics and Space Administration launch, Sunsat will carry a precision GPS receiver and a set of Laser retro-reflectors, provided by, and for use of NASA.

End of life

Out of service 19 Jan 2001
Cause Hardware failure


SED, University of Stellenbosch, Stellenbosch, 7600, South Africa
Tel: +27-21-8084103

External resources


sat-index articles

Technical data


Prime contractor  
Mass at launch 60 kg
Mass in orbit  
Dimension 45 x 45 x 62 cm
Solar array  
DC power  
Design lifetime  

The payload includes duplicate transmitters and receivers for the 2-meter (145.825 MHz) and 70-cm bands, a 24-cm (1260 MHz) receiver and 13-cm (2400 MHz) receiver. A number of uplink and downlink frequency combinations are possible. Sunsat will offer extensive digital communication capability. One of the 2-meter receivers has four IF sections connected to 1200-baud AFSK packet modems. The satellite carries three G3RUH-compatible 9600-baud modems that can be switched to various receivers and transmitters.

Telemetry on 436.25 & 436.30 MHz

It carries two NASA experiments and an experimental pushbroom imager capable of taking pictures of the earth. The high resolution imager providing 50x50 km coverage will operate in real time on S band.

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