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NASA’s Juno spacecraft will get its closest look but at Jupiter’s moon Io on Dec. 30

December 30, 2023
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NASA’s Juno spacecraft will get its closest look but at Jupiter’s moon Io on Dec. 30
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NASA’s Juno mission will come nearer to Jupiter’s moon Io than any spacecraft has in round 20 years on Saturday (Dec. 30).

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The flyby will convey Juno to round 930 miles (1,500 kilometers) of Io, essentially the most volcanic physique within the photo voltaic system. This may enable the spacecraft to take an in depth have a look at Io because it gathers a treasure trove of sizzling knowledge. It is shut, however not the closest ever glimpse by a spacecraft: that report belongs to NASA’s Galileo spacecraft, which skimmed simply 181 kilometers (112 miles) above Io’s south pole in 2001.

Juno launched on August 5, 2011, and reached the gasoline big Jupiter, the most important planet within the photo voltaic system, on July 4, 2016, after a 1.7 billion-mile (2.8-billion-kilometer) journey. Since then, the Jupiter orbiter has made 56 flybys of the gasoline planet, amassing knowledge on it and its moons, and is about to start its subsequent.

“By combining knowledge from this flyby with our earlier observations, the Juno science group is finding out how Io’s volcanoes fluctuate,” Southwest Analysis Institute scientist and Juno principal investigator Scott Bolton said in a statement. “We’re searching for how usually they erupt, how brilliant and sizzling they’re, how the form of the lava circulation adjustments, and the way Io’s exercise is related to the circulation of charged particles in Jupiter’s magnetosphere.”

Associated: Jupiter’s moon Io is roofed in lively volcanoes. Now we’ve the first map of them

Now within the third yr of its prolonged mission, with its main mission having resulted in July 2021, Juno will make one other shut flyby of Io on Feb. 3, 2024, in the case of inside round 930 miles (1,500 km) of the volcanic floor of this Jovian world. 

The Dec. 2023 and Feb. 2024 flybys of Io will add to the wealth of knowledge that scientists have gathered about Io because of Juno, which has been monitoring its volcanic exercise from distances that vary from 6,830 miles (11,000 km) to over 62,100 miles (100,000 km). In its time of operation, the NASA spacecraft has additionally provided researchers with their first views of Io’s north and south poles. 

a grey and white moon with bright red spots on its surface indicating the locations of 'hot spots' believed to be volcanoes

Volcanos on the surface of Io. (Image credit: NASA/JPL-Caltech/SwRI/ASI/INAF/JIRAM)

Why examine Jupiter’s “tortured moon” Io?

The floor of Io, which is across the dimension of Earth’s moon, is suffering from lots of of actively erupting volcanoes able to blasting lava dozens of miles into the skinny, waterless ambiance of the Jovian moon. 

The innermost Galilean satellite tv for pc of Jupiter, one of many 4 massive Jovian moons, Io, is believed to be so extraordinarily volcanic due to the gravitational affect of the gasoline big planet and that of its three different Galilean moons — Europa, Ganymede, and Callisto. 

This generates tidal forces which are so highly effective they will trigger the floor of Io to rise and fall by as a lot as 330 ft (100 meters), triggering excessive volcanism.

“With our pair of shut flybys in December and February, Juno will examine the supply of Io’s huge volcanic exercise, whether or not a magma ocean exists beneath its crust, and the significance of tidal forces from Jupiter, that are relentlessly squeezing this tortured moon,” Bolton added.

Io’s volcanism is important to know as a result of it doubtless has an influence on the broader Jovian system. For instance, volcanic particles escaping from the ambiance of Io are thought to turn out to be trapped by the magnetic subject of Jupiter, forming a sizzling donut of plasma across the gasoline big planet. 

storms swirl on jupiter

An examination of Jupiter’s swirling storms, by Juno. (Image credit: NASA/JPL-Caltech/SwRI/MSSS/Kevin M. Gill)

How does Juno examine Io

Through the flyby of Io this weekend, all of  Juno’s three cameras will likely be lively. The Jovian Infrared Auroral Mapper (JIRAM), will likely be amassing details about the volcanic moon’s warmth signature finding volcanoes and calderas throughout the Jovian moon. In the meantime, the navigational star digicam, the Stellar Reference Unit, will acquire the best decision photographs of the volcano-riven floor of Io but gathered. 

Final, however certainly not least, JunoCam, which is included in Juno’s suite of devices to drive public engagement, will catch full-color visible-light photographs of the volcanic moon.  

JunoCam was designed to final for simply eight flybys of Jupiter, making the pictures of Io it is going to acquire throughout this 57th flyby much more exceptional. All three cameras and the Juno spacecraft itself have needed to courageous and stand up to the punishing radiation surroundings round Jupiter, arguably the harshest within the photo voltaic system, barring that of the solar, to proceed this exceptional science mission. However, this punishment has begun to indicate. 

“The cumulative results of all that radiation has begun to indicate on JunoCam over the previous couple of orbits,” Juno challenge supervisor Ed Hirst stated. “Footage from the final flyby present a discount within the imager’s dynamic vary and the looks of ‘striping’ noise. Our engineering group has been engaged on options to alleviate the radiation harm and to maintain the imager going.”

An image of Io taken by Juno shows volcanic material being ejected into the jovian moon's thin atmosphere

A picture of Io taken by Juno  exhibits volcanic materials being ejected into the jovian moon’s skinny ambiance (Picture credit score: NASA/JPL-Caltech/SwRI/MSSS)

Following Juno’s orbit of Io in Feb. 2024, the NASA orbiter will skim the Jovian moon on every of its subsequent orbits of Jupiter, however every will turn out to be subsequently additional away from Io’s volcanic floor.

The primary flyby after Feb will likely be at an altitude of about 10,250 miles (16,500 km) over Io, whereas the final will convey the NASA spacecraft to inside simply round 71,450 miles (115,000 kilometers) of the volcanic moon.

Juno will even now start to expertise durations throughout which Jupiter eclipses the solar, blocking its entry to solar energy and main it to expertise darkness for the primary time because it left Earth.

This is not anticipated to influence the operation of Juno, and from April 2024, the spacecraft will use these occultation occasions to help its Gravity Science Experiment to analyze the composition of the higher ambiance of Jupiter and acquire details about the planet’s form and its inside construction. 

Juno’s prolonged mission investigating the Jovian system will final till Sept. 2025, when NASA says the spacecraft will attain the top of its life and can doubtless be deliberately crashed into the ambiance of the gasoline big. 



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