STARS-II

 ( Spacecraft Launched In 2014 ) 

Space Tethered Autonomous Robotic Satellite II or STARS-II, was a Nano Satellites built by Japan's Kagawa University to test an electrodynamic tether in low Earth orbit, a follow-on to the STARS mission.

STARS-II was launched by an H-IIA rocket, flying in the 202 configuration, as a secondary payload aboard the launch of the GPM Core Observatory on 27 February 2014. After two months in orbit, STARS-II reentered the atmosphere on 26 April 2014.

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Flight Plan The satellite split into two parts, connected by a tether, to conduct its experiments which consisted of recording a video of tether deployment and using the tether to deorbit the satellite. The spacecraft consisted of a base vehicle, with dimensions of and a vehicle at the end of the tether measuring .Herbert J. Kramer, STARS-II, eoPortal (accessed 7 July 2016) The electrodynamic tether was made from ultra-thin wires of stainless steel and aluminium.Justin McCurry, Scientists in Japan to put Stars-2 satellite into orbit to trial space cleanup, The Guardian, 27 February 2014 (accessed 7 July 2016)

One objective of this program was to demonstrate possible technology for de-orbiting space debris.

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Results STARS-II was successfully launched at 3:37am (JST) on 28 February 2014 (27 February UTC), and amateur radio downlink showed that it successfully separated from the carrier vehicle, however, the experiment was only partially successful, and tether deployment could not be confirmed.

Initial radio data suggested that the solar arrays and antennas were not deployed. The beacon from the daughter spacecraft became weak, and after several weeks was no longer received. It was inferred that solar battery power was low due to its small body. However, the beacon from the mother spacecraft later became strong, and it was inferred that the solar arrays and antennas were deployed by restarting. However, the Command and Data Handling subsystem did not work, possibly due to radiation.M. Nohmi, "Initial Orbital Performance Result of Nano-Satellite STARS-II", International Symposium on Artificial Intelligence, Robotics and Automation in Space (I-SAIRAS), Montreal, Canada, 17–19 June 2014(accessed 7 July 2016)

The orbit decayed from 350 km to 280 km in 50 days, considerably faster than the other cubesats launched on the same mission, which is indirect indication that the tether deployed, increasing the drag. However, telescopic photography of the satellite from the ground showed the satellite as a single point, rather than two objects. The experimenters suggest that this may have been due to the tether extending, but being tangled by rebound.

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Follow-on A follow-on to the STARS and STARS-II satellites, STARS-C ( Space Tethered Autonomous Robotic Satellite-Cube, COSPAR 1998-067KR, SATCAT 41895) was announced as a satellite to be launched from the Japanese Experiment Module of the International Space Station. University orbiter set to lift space elevator technology THE ASAHI SHIMBUN, 6 July 2016 (accessed 7 July 2016)Alyssa Navarro, Japan's Space Elevator Technology Will Be Put To Test Soon, 7 July 2016, Tech Times (accessed 7 July 2016)

STARS-C was a 2U cubesat consisting of a mother satellite and a daughter satellite, designed to deploy a 100-m aramid fiber tether. It was launched on 9 December 2016, from J-SSOD and re-entered on 3 March 2018. However, the signal quality was intermittent, possibly due to failure of deployment of the solar panel, and data on tether deployment was not obtained. Estimates from orbital drag measurements suggest that the tether deployed to a length of about 30 meters.Yamagiwa, Y., et al. (Dec. 2020). "Space experimental results of STARS-C CubeSat to verify tether deployment in orbit," Acta Astronautica, Vol. 177 /ref>

Also other Japanese STARS satellites have been launched, like STARS-ME, Stars-AO and STARS-EC.

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See also

• Tether satellite
• Space tether missions
• STARS-EC
• STS-75

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External links

• Project page
• Eoportal.org Stars-2 page
• NASA Stars-2 page

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