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9 scientific instruments approach Jupiter with Juno
At 11:53 on July 5th, Beijing time, the 'Juneo' probe successfully entered Jupiter's orbit. Its orbit around Jupiter is about 4,100 kilometers from the top of Jupiter's clouds, making it the closest spacecraft to Jupiter for humans to date. In the next 20 months, it will orbit Jupiter 37 times to detect the origin, internal structure, atmosphere and magnetic field of Jupiter. Why is it called 'Juneo'? Juno is the wife of Jupiter, the king of gods in Roman mythology. Jupiter used magic power to cover himself with clouds, but Juno was able to penetrate the clouds and see the truth. Scientists hope that the Juno probe can see through Jupiter's thick clouds like Juno, gain insight into its internal structure, and understand the secrets of this gas giant planet. What does the Juno look like? The main body of the Juno is like a hexagonal box, with a titanium dome structure weighing 180 kilograms at the front to protect sensitive electronic equipment from radiation damage. The device is equivalent to the trunk of an SUV, and can reduce the radiation intensity of electronic equipment by 800 times. After lift-off, the three solar panels of the 'Juneo' will protrude from its hexagonal body, each of which is 8.8 meters long and 2.8 meters wide, and stretched out like the blades of a windmill. What is the background of the 'Juneau' mission? The 'Juneau' Jupiter probe is part of NASA's 'Xinjiang Boundary' program, which is operated at the Marshall Space Flight Center in Huntsville, Alabama Implement. The 'Juneau' probe was built by Lockheed Martin, and the NASA Jet Propulsion Laboratory is responsible for the operation of the entire detection mission. The total investment of the 'Juneo' project is approximately US$1.1 billion, including related service costs such as detector research and development, scientific payloads, launch services, operating expenses, scientific data processing, and measurement and control support. The probe was launched from Cape Canaveral Air Force Base in Florida, USA on August 5, 2011. Which 'passengers' are there on the 'Juneo'? The 'Juneo' detector is equipped with 9 scientific instruments, which are Gravity Science, Magnetometer, and Microwave Radiometer (MWR). , Jupiter Energetic Particle Detector (JEDI), Jupiter Aurora Distribution Experimental Device (JADE), Plasma Wave Device (WAVES), Jupiter Infrared Auroral Plotter (JIRAM), Ultraviolet Imaging Spectrometer (UVS) and Juno Camera (JunoCam). In addition, there are 3 special passengers who are only 4 cm high. They are the three Lego figures specially made by Lego Corporation for NASA. They are the Italian astronomer Galileo, the Roman mythological figure Jupiter (the same name as Jupiter), and his wife Juno (the same name as the Juno probe). Why does the Juno turn around? Juno is a solar-powered spacecraft that uses spin stabilization. The spin can enhance the stability of the spacecraft's pointing and facilitate ground control. During the execution of the project, the rotation rate of the 'Juneo' will continue to change: 1 lap per minute during the cruise phase; 2 laps per minute during the scientific expedition phase; and 5 laps per minute during the main engine attitude adjustment phase. In addition, the benefits of rotation include simplified design and reduced mass. All equipment will sweep Jupiter once during rotation. How about the 'hardware configuration' of the Juno? The Juno is equipped with a main engine, a dual-propulsion engine, and 12 attitude-adjusting engines with lower thrust. The former is located at the rear of the detector and is mainly used for larger orbit adjustments and deceleration braking, while the latter is mainly used for precise adjustment of attitude during flight. The brain of the Juno uses a RAD750 anti-radiation processor, which can handle 1 million times the lethal radiation dose. It is the same model as the Curiosity rover, with 256M flash memory and 128M local storage space. How far did the Juno fly? Until today, it flew into the orbit of Jupiter, and the Juno has flown about 2.7 billion kilometers. It takes approximately 48 minutes for the signal to travel back to Earth from Jupiter at the speed of light. What is the significance of 'Juneo'? 'Juno' will help us understand the composition of Jupiter and its internal structure; reveal the source of Jupiter's powerful magnetic field and mysterious auroral phenomenon; determine whether Jupiter has a rock core and water. In addition, improve people's understanding of the earth, the solar system and even the formation of stars. Which other detectors have visited Jupiter? According to reports, 8 detectors have visited Jupiter and its satellites so far, including Voyager, and later Pioneer, Galileo, and Yuri The Sith, etc., the most recent is the 'New Horizons' Jupiter probe launched in 2007. 'Juneo' is the ninth Earth visitor to Jupiter and the second man-made spacecraft 'resident' in Jupiter's orbit. When will the mission end, and where does 'Juneo' go? According to the plan, the exploration mission will end on February 20, 2018. At that time, the 'Juneo' will be washed into Jupiter’s outer atmosphere and burned to avoid toxic fuel pollution. The moons of Jupiter of life.
Ball Burst Method (ASTM D3787): Steel ball penetration for textiles/films using testers like GT-C02-2.
Hydraulic Method (ISO 13938.1): Fluid pressure on rubber diaphragm for industrial fabrics via GT-C12A.
Pneumatic Method (ISO 13938.2): Compressed air for breathable materials tested with GT-C12B.
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