The REXUS/BEXUS (Rocket Experiments for University Students / Balloon Experiments for University Students) programme is a cooperation between the German Aerospace Center (DLR) and the Swedish National Space Agency (SNSA) that allows students from higher education institutions to study experiments on board sounding rockets and stratospheric balloons. [1] Through a collaboration with the European Space Agency (ESA), the opportunity has been made available for students across all ESA Member States, Slovenia and Canada. The Swedish Space Corporation (SSC) and the Mobile rocket base (MORABA) of DLR are responsible for the launch. Students are getting support from experts of DLR, ESA, SSC and ZARM. The programme started in 2007. [2]
Each year, two REXUS rockets and two BEXUS balloons are launched from the Esrange Space Center in northern Sweden. A maximum of 20 experiments designed and built by student teams are flown every year. [3] As of 2017, 147 experiments involving more than 1200 students from all over Europe were successfully launched. The launch vehicles are suitable for carrying research in various scientific areas such as atmospheric science, radiation physics, control systems, communication, aerodynamics and more. [2]
Size | |
---|---|
Height | 5.6 m |
Diameter | 356 mm |
Stages | Single stage |
Launch history | |
Launch sites | Esrange Space Center |
Total launches | 32 |
Single stage | |
Powered by | Improved Orion |
REXUS rockets are launched from Esrange on an annual basis (nominally 2 rockets per year). The rocket is spin-stabilised and powered by 290 kg of an Improved Orion motor. The rocket can embed up to 40 kg of experiments to an altitude of 70 to 90 km. [4] The peak acceleration of the rocket is about 17 g. [5] A yo-yo de-spin system is used to reduce the spin rate of the rocket from 4 Hz to 0.08 Hz before reaching the apogee. The nosecone can be ejected during flight. [6] As of March 2024, 32 REXUS rockets have been launched. [7]
REXUS is part of the rocket family operated by the Mobile Rocket Base (MORABA), a branch of DLR. [8]
BEXUS balloons are launched from Esrange on an annual basis (nominally 2 balloons per year). BEXUS consists of a 12,000 m3 Zodiac 12 SF plastic balloon filled with helium gas. It can lift up to 100 kg of experiments to an altitude of 25–35 km during a period of 2 to 5 hours. The length of the balloon train from the top of the balloon to the gondola is about 65 to 100 m. [4] As of 2019, 29 BEXUS balloons have been flown. [9]
U-PHOS (Upgraded PHP Only for Space) is one of the selected experiments of the programme. [10]
A sounding rocket or rocketsonde, sometimes called a research rocket or a suborbital rocket, is an instrument-carrying rocket designed to take measurements and perform scientific experiments during its sub-orbital flight. The rockets are used to launch instruments from 48 to 145 km above the surface of the Earth, the altitude generally between weather balloons and satellites; the maximum altitude for balloons is about 40 km and the minimum for satellites is approximately 121 km. Certain sounding rockets have an apogee between 1,000 and 1,500 km, such as the Black Brant X and XII, which is the maximum apogee of their class. Sounding rockets often use military surplus rocket motors. NASA routinely flies the Terrier Mk 70 boosted Improved Orion, lifting 270–450-kg (600–1,000-pound) payloads into the exoatmospheric region between 97 and 201 km.
Vega is an expendable launch system in use by Arianespace jointly developed by the Italian Space Agency (ASI) and the European Space Agency (ESA). Development began in 1998 and the first launch took place from the Guiana Space Centre on 13 February 2012.
Esrange Space Center is a rocket range and research centre located about 40 kilometers east of the town of Kiruna in northern Sweden. It is a base for scientific research with high-altitude balloons, investigation of the aurora borealis, sounding rocket launches, and satellite tracking, among other things. Located 200 km north of the Arctic Circle and surrounded by a vast wilderness, its geographic location is ideal for many of these purposes.
The Swedish National Space Agency is a Government agency in Sweden operating under the Swedish Ministry of Education and Science. SNSA operates as a key component of the Swedish space programme, which is mostly carried out through international cooperation, and has included a sequence of satellite missions, both national ones and in cooperation with other nations. Furthermore, the agency distributes government grants to research and development, initiates research and development in space and remote sensing, and acts as the Swedish contact in international cooperative efforts.
The Swedish Space Corporation, SSC, also registered as Svenska rymdaktiebolaget, is a Swedish space services company. SSC operations consist of launches of sounding rockets and stratospheric balloons, tests of future generation rocket engines and new rocket fuels, operation and maintenance of space and aviation systems, as well as satellite communications through the use of SSC ground stations deployed around the world. SSC is also working on developing its Space Surveillance Tracking (SST) and Space Traffic Management (STM) programs with the aim to identify, assess and minimize risks of collisions and disruptions associated with space debris.
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