Animacja przedstawia punkt widzenia sondy podczas zbliżania się do planety.
Wyjątkowo długi bo 10,5 godzinny manewr korygujący trajektorię wykonany z 30 września na 1 października pozwolił
sondzie uniknąć ryzykownego zagłębienia się w cień planety podczas bliskiego przelotu 3 listopada.NASA's Juno Prepares to Jump Jupiter's ShadowOct. 1, 2019
This animated gif depicts the point of view of NASA's Juno spacecraft during its eclipse-free approach to the gas giant Nov. 3, 2019. The Sun is depicted as the yellow dot rising up just to left of the planet. Credits: NASA/JPL-Caltech/SWRILast night, NASA's Juno mission to Jupiter successfully executed a 10.5-hour propulsive maneuver — extraordinarily long by mission standards. The goal of the burn, as it's known, will keep the solar-powered spacecraft out of what would have been a mission-ending shadow cast by Jupiter on the spacecraft during its next close flyby of the planet on Nov. 3, 2019.
Juno began the maneuver yesterday, on Sept. 30, at 7:46 p.m. EDT (4:46 p.m. PDT) and completed it early on Oct. 1. Using the spacecraft's reaction-control thrusters, the propulsive maneuver lasted five times longer than any previous use of that system. It changed Juno's orbital velocity by 126 mph (203 kph) and consumed about 160 pounds (73 kilograms) of fuel. Without this maneuver, Juno would have spent 12 hours in transit across Jupiter's shadow — more than enough time to drain the spacecraft's batteries. Without power, and with spacecraft temperatures plummeting, Juno would likely succumb to the cold and be unable to awaken upon exit."With the success of this burn, we are on track to jump the shadow on Nov. 3," said Scott Bolton, Juno principal investigator at the Southwest Research Institute in San Antonio. "Jumping over the shadow was an amazingly creative solution to what seemed like a fatal geometry. Eclipses are generally not friends of solar-powered spacecraft. Now instead of worrying about freezing to death, I am looking forward to the next science discovery that Jupiter has in store for Juno."
Juno has been navigating in deep space since 2011. It entered an initial 53-day orbit around Jupiter on July 4, 2016. Originally, the mission planned to reduce the size of its orbit a few months later to decrease the period between science flybys of the gas giant to every 14 days. But the project team recommended to NASA to forgo the main engine burn due to concerns about the spacecraft's fuel delivery system. Juno's 53-day orbit provides all the science as originally planned; it just takes longer to do so. The spacecraft's longer life at Jupiter is what led to the need to avoid the gas giant's shadow. (...)
https://www.nasa.gov/feature/jpl/nasas-juno-prepares-to-jump-jupiters-shadow
Wątek: Juno (Przeczytany 121287 razy)