The TUBSAT series of microsatellites are designed and built at the Technical University of Berlin (TUB).
The primary objective of TUBSAT-1 is academic research, particularly in the field of attitude determination. It was financed by the German BMFT.
It was launched on the 17th of July 1991 as a secondary payload on the V35 ARIANE ASAP, alongside three other secondary payloads UoSAT-5, DATACOM-X and SARA, and the primary payload ERS-1. The orbit is 10:30am sun-synchronous, circular, with an inclination of 98.5 degrees and a height of 780km. Tubsat weighs 35kg, and has a cubical shape with 380mm sides (picture 1, picture 2).
It has a three axis star sensor, a fixed momentum wheel and magnetorquer coil, a two axis sun-sensor and three axis magnetometer. The communication systems employ frequencies in the amateur satellite service VHF and UHF bands. The uplink is 143.075MHz and uses FSK 1200/1800.
TUBSAT-2 was launched 25 January 1994 on a Russian launcher into a alongside Meteor-3 into a 1221x1198km orbit inclined at 82.6 degrees. TUBSAT-2 includes a second star sensor with 1m focal length, which also acts as a camera. Also included is a 3kg three axis reaction/momentum wheel, and meteorological and radiation budget instruments. (picture)
TUBSAT-C(?) is reported to include laser ring gyros and a high resolution camera. It is reported that the high resolution camera focusing is faulty.