They’ve arrived! Images from NASA’s Juno spacecraft P7 pass have landed on Earth (a few days early no less) showing Jupiter’s Great Red Spot from the closest distance that it’s ever been imaged before. Captured on the night of July 10 (early July 11 morning UTC) the closest Junocam images were taken from a distance of only about 5,600 miles from the top of the storm’s clouds—that’s less than an Earth diameter away from a hundreds-year-old hurricane an Earth and a half wide!
Today, July 10 (July 11 UTC) NASA’s Juno spacecraft will make its first targeted flyover of Jupiter’s famous Great Red Spot since its arrival in orbit on July 4, 2016, getting our best look yet at the giant anticyclonic storm that’s been churning on the giant planet since at least 1830 (and possibly even since before 1665.)
Previous spacecraft (Voyager, Galileo, Cassini, New Horizons) have imaged the Great Red Spot but none from as close a distance as Juno will tonight. During P7—Juno’s seventh “perijove,” or closest point to Jupiter in its 53-day-long orbital path—Juno will pass over the GRS at an altitude of only about 5,600 miles.
Perijove (the point at which an orbit comes closest to Jupiter’s center) will be on Monday, July 10, at 6:55 p.m. PDT (9:55 p.m. EDT). At the time of perijove, Juno will be about 2,200 miles (3,500 kilometers) above the planet’s cloud tops. Eleven minutes and 33 seconds later, Juno will have covered another 24,713 miles (39,771 kilometers) and will be directly above the coiling crimson cloud tops of Jupiter’s Great Red Spot. The spacecraft will pass about 5,600 miles (9,000 kilometers) above the [Great] Red Spot clouds.
Once the flyover data is transmitted and received on Earth sometime on Friday, July 14 we can expect amateur image processors (myself definitely included!) to feverishly get to work bringing out as many details as possible in the raw data. (You can find raw images from Junocam and processed versions from the public here.) This, as they say, is going to be good!
Source/read more from NASA here: NASA’s Juno Spacecraft to Fly Over Jupiter’s Great Red Spot July 10
On April 3, 2017, as Jupiter made its nearest approach to Earth in a year, NASA’s Hubble Space Telescope viewed the solar system’s largest planet in all of its up-close glory. At a distance of 415 million miles (668 million km) from Earth, Jupiter offered spectacular views of its colorful, roiling atmosphere, the legendary Great Red Spot, and its smaller companion at farther southern latitudes dubbed “Red Spot Jr.” Taken with Hubble’s Wide Field Camera 3, the image resolves details in Jupiter’s atmosphere as small as about 80 miles (129 km) across.
Read the full article on NASA’s Hubble site here, and check out a version I made with enhanced contrast and sharpness to bring out some details in Jupiter’s clouds below:
Everyone knows about Jupiter’s famous Great Red Spot, the centuries-old giant anticyclone on Jupiter’s southern hemisphere 2-3 times the size of Earth. But there are many other smaller (but still huge by terrestrial standards!) storms on Jupiter, the largest of which is Oval BA—also known as the “Red Spot Jr.” The image above shows this approximately Earth-sized anticyclone, imaged by NASA’s Juno spacecraft during its 4th “perijove” close pass on Feb. 2, 2017.
I enhanced the original image from Juno’s Junocam instrument to bring out the structure and colors of the swirling clouds in Oval BA. You can see some bright cloud top domes within the center of the storm itself, the result of “boiling” convection cells not unlike what happens in storms on Earth…except on a much larger scale!
It’s the signature accessory of the largest planet in our solar system: Jupiter’s Great Red Spot, an enormous anticyclone over twice the width of our entire planet. Visible in even modest backyard telescopes, the GRS has been churning away for at least several hundred years. But, based on recent analysis of data gathered by the Cassini spacecraft during its pass by Jupiter in December 2000, the Great Red Spot’s rusty coloration may actually only be skin-deep – a “sunburn” created by interaction between Jupiter’s upper atmosphere and solar radiation.