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Young Engineers' Satellite


Designation 25025 / 97066C
Launch date 30 Oct 1997
Country of origin Europe
Mission Technology
Perigee/Apogee 545/26626 km
Inclination 7.7°
Period 468 min
Launch vehicle Ariane V101

Was released by Maqsat H.

Developed by Delta-Utec Space Research and Consultancy YES is a sub-satellite to study the dynamics of tethered satellites. It was designed, assembled and integrated in record time by young graduates and students at ESTEC. A GPS receiver is installed to evaluate the use of GPS for navigation, especially above the GPS satellite constellation. YES also contains technology validation experiments which will measure radiation, the solar angle and acceleration in autonomous mode, after separation from MAQSAT-H. It also carried a commercial technology PC and camera experiment.

Originally it should have been tether-attached (double strand tether, 35 km).

There is another 12 kg satellite, TORI (Tethered ORbit Insertable) that is attached to the other side of the tether and would also be released form MAQSAT-H, but due to the cancellation is still attached. TORI carries the first application of an 1.5 m absorptive tether in space as a passively extensible rod and for shock absorption. TORI carries some autonomous electronics that are part of the tether experiment.

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