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OUTER PLANETS
Ride with Juno as it flies past Jupiter and Ganymede
by Staff Writers
Pasadena CA (JPL) Jul 15, 2021

Video: Juno Flies Past the Moon Ganymede and Jupiter, With Music by Vangelis

On June 7, 2021, NASA's Juno spacecraft flew closer to Jupiter's ice-encrusted moon Ganymede than any spacecraft in more than two decades. Less than a day later, Juno made its 34th flyby of Jupiter, racing over its roiling atmosphere from pole to pole in less than three hours. Using the spacecraft's JunoCam imager, the mission team has put together this animation to provide a "starship captain" point of view of each flyby.

"The animation shows just how beautiful deep space exploration can be," said Scott Bolton, principal investigator for Juno from the Southwest Research Institute in San Antonio.

"The animation is a way for people to imagine exploring our solar system firsthand by seeing what it would be like to be orbiting Jupiter and flying past one of its icy moons. Today, as we approach the exciting prospect of humans being able to visit space in orbit around Earth, this propels our imagination decades into the future, when humans will be visiting the alien worlds in our solar system."

The 3:30-minute-long animation begins with Juno approaching Ganymede, passing within 645 miles (1,038 kilometers) of the surface at a relative velocity of 41,600 mph (67,000 kph). The imagery shows several of the moon's dark and light regions (darker regions are believed to result from ice sublimating into the surrounding vacuum, leaving behind darkened residue) as well as the crater Tros, which is among the largest and brightest crater scars on Ganymede.

It takes just 14 hours, 50 minutes for Juno to travel the 735,000 miles (1.18 million kilometers) between Ganymede and Jupiter, and the viewer is transported to within just 2,100 miles (3,400 kilometers) above Jupiter's spectacular cloud tops. By that point, Jupiter's powerful gravity has accelerated the spacecraft to almost 130,000 mph (210,000 kph) relative to the planet.

Among the Jovian atmospheric features that can be seen are the circumpolar cyclones at the north pole and five of the gas giant's "string of pearls" - eight massive storms rotating counterclockwise in the southern hemisphere that appear as white ovals. Using information that Juno has learned from studying Jupiter's atmosphere, the animation team simulated lightning one might see as we pass over Jupiter's giant thunderstorms.

The camera's point of view for this time-lapse animation was generated by citizen scientist Gerald Eichstadt, using composite images of Ganymede and Jupiter. For both worlds, the JunoCam images were orthographically projected onto a digital sphere, and then synthetic frames were added between actual images to make the motion appear smoother and provide views of approach and departure for both Ganymede and Jupiter.

As planned, the gravitational pull of the giant moon has affected Juno's orbit, resulting in the reduction of its orbital period from 53 days to 43 days. The next flyby of Jupiter, the 35th of the mission, is scheduled for July 21.


Related Links
Juno at NASA
Juno at SwRI
The million outer planets of a star called Sol


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OUTER PLANETS
Surface of Jupiter's moon Europa churned by small impacts
Pasadena CA (JPL) Jul 14, 2021
It's easy to see the impact of space debris on our Moon, where the ancient, battered surface is covered with craters and scars. Jupiter's icy moon Europa withstands a similar trouncing - along with a punch of super-intense radiation. As the uppermost surface of the icy moon churns, material brought to the surface is zapped by high-energy electron radiation accelerated by Jupiter. NASA-funded scientists are studying the cumulative effects of small impacts on Europa's surface as they prepare to expl ... read more

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Ride with Juno as it flies past Jupiter and Ganymede









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