cosmos.wikisort.org - Spacecraft

e-st@r (Educational Satellite @ Politecnico di Torino) is a miniaturised satellite built by the Politecnico di Torino.[3] It is a 1U CubeSat design with a 10 cm side and a mass not exceeding 1.33 kg.

e-st@r

The Polytechnic University of Turin CubeSat
Names	est@r e-star
Mission type	Technology demonstration
Operator	Politecnico di Torino
COSPAR ID	2012-006C
SATCAT no.	38079
Mission duration	4 years (planned)
Spacecraft properties
Spacecraft type	CubeSat
Manufacturer	Politecnico di Torino
Launch mass	1 kg (2.2 lb)
Start of mission
Launch date	13 February 2012, 10:00:00 UTC[1]
Rocket	Vega (VV01)
Launch site	Kourou, ELV
Contractor	Arianespace
Orbital parameters
Reference system	Geocentric orbit[2]
Regime	Low Earth orbit
Perigee altitude	302 km (188 mi)
Apogee altitude	1,082 km (672 mi)
Inclination	69.47°
Period	98.47 minutes

Launch and deployment

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:

• e-st@r of the Polytechnic of Turin,
• Goliat of the Romanian Space Agency,
• MaSat-1 of the Budapest University of Technology and Economics,
• PW-Sat of the Warsaw Polytechnic,
• ROBUSTA of the University of Montpellier II,
• UniCubeSat-GG of the University of Rome La Sapienza,
• Xatcobeo of the University of Vigo.

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 uses a processor PIC and communicates with the ground at a frequency of 437.445 MHz with a power of 0.5 W. The frequencies have been assigned to cubesats by ESA.

A total of about 50,000 euros was spent on the design and construction of the satellite.

The orbit is inclined 71° and is slightly elliptical. It also crosses the van Allen belts.

The satellite was created by the CubeSatTeam of the Polytechnic of Turin, responsible for creating picosatellites.[6]

References

External links

• http://areeweb.polito.it/cubesat-team
• http://space.skyrocket.de/doc_sdat/e-star.htm

На других языках

---

- [en] E-st@r

---

[ru] E-st@r

e-st@r — итальянский ИСЗ, разработанный Туринским политехническим университетом с целью опробования новой A-ADCS (англ. Active - Attitude Determination and Control System — Активная Система Контроля и Определения Ориентации). Введение ориентации является одним из важнейших средств повышения возможностей будущего «CubeSat» и малых спутников в целом. Предоставление спутнику возможности активно контролировать своё пространственное положение может представлять ключевой интерес для будущего развития сложных миссий, связанных с малыми спутниками. Факторами, влияющими на выбор этого эксперимента, были: важность результатов эксперимента, влияние эксперимента на успешное выполнение миссии «e-st@r» и надёжность, знания и опыт группы, имеющиеся ресурсы для развития эксперимента с точки зрения бюджета, средств и людей, и периода времени развития. Побочными целями миссии были: проведение научных работ студентами и аспирантами, обучение специалистов в космонавтике[1].

---

---