• ARTSAT:On-Orbit




データ提供:東京大学中須賀研 PRISMチーム

With states of "high vacuum" that causes the outgassing (release of a gas that was dissolved, trapped, frozen or absorbed) or cold welding (process in which joining takes place without fusion/heating) of materials; microgravity in which floatage triggers short circuits or impedes mobility; high radiation inflicting damage or failure of electronic devices; and in addition, "cosmic dust" and "space debris" flying around, space is an environment with extreme conditions that are hard to imagine on the ground. Looking at the issue of heat alone, between the 6,000°C hot sun itself and outer space with a temperature close to absolute zero, there are huge temperatures differences, ranging from over 100°C at places irradiated by the sun, and several dozen degrees below zero at points the rays of the sun don't reach. As we are talking about a vacuum plus microgravity situation, there is no air-cooling, and no convection currents that could mitigate the thermal differences. In order to ensure the normal function of a computer in such kind of environment, and protect the vulnerable rechargeable batteries from high and low temperatures, accurate analysis and simulation, and appropriate design are imperative.

At Terminal 2 "Environment", the temperature and position of the satellite in orbit, as well as geomagnetic forces and other environmental aspects surrounding the satellite, are being visualized intuitively in chronological order. As it is impossible to follow a satellite in its orbit, even the developers themselves will never be able touch the satellite again once it has been launched. To make the satellite "feel" its environment in as real a manner as possible is one of this project's central themes. The displays at this terminal are based on actual sensor data transmitted from The University of Tokyo's nano-satellite PRISM that is currently in operation.

Data contributed by PRISM Project Team, Intelligent Space Systems Laboratory, The University of Tokyo