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e-st@r (Educational Satellite @ Politecnico di Torino) was a miniaturised satellite built by the Politecnico di Torino.[3] It was a 1U CubeSat design with a 10 cm side and a mass not exceeding 1.33 kg.
In 2006 the Polytechnic University of Turin had tried to put one of its satellites into orbit (PiCPoT), but the Dnepr launcher used exploded a few seconds after the start and destroyed itself.
In 2009 the European Space Agency in view of the inaugural launch of Vega (which being the first launch had a high probability of failure) offered 9 seats on the carrier for the same number of cubesats, plus another two seats for larger satellites. Only 7 of the cubesats managed to be prepared in time for launch:
They were launched into low Earth Orbit on the maiden flight of Arianespace's Vega rocket on 13 February 2012 on a multi-payload mission shared with LARES of the Italian Space Agency and ALMASat-1 of the University of Bologna.
The satellite was successfully deployed into orbit, and the signal was received by the team's ground station and by amateur radio operators.[4] However, operations have been impeded by unexpected tumbling, and the satellite was put into safe mode.[5]
The communication system used a PIC microcontroller and communicated with the ground at a frequency of 437.445 MHz with a power of 0.5 W. The frequencies had been assigned to cubesats by ESA.
A total of about 50,000 euros were spent on the design and construction of the satellite.
The orbit was inclined 71° and slightly elliptical. It also crossed the van Allen belts.
The satellite was created by the CubeSatTeam of the Polytechnic of Turin, responsible for creating picosatellites. The team later developed e-st@r-II to be sent to the orbit again as part of ESA's "Fly Your Satellite" program in 2016.[6]
