JWST’s newest picture of Saturn, with the moons Dione, Tethys and Enceladus seen on the left
Space Telescope Science Institute Office of Public Outreach Provider: NASA, ESA, CSA, JWST Saturn Team, Joseph Depasquale (STScI)
Saturn has been captured by the James Webb Space Telescope (JWST) as a ghostly sphere, with its rings shining brighter than ever earlier than. Three of its moons, Dione, Tethys and Enceladus, are additionally seen.
“It’s not a familiar view of Saturn by any stretch of the imagination,” says Leigh Fletcher on the University of Leicester, UK. “In the atmosphere, you don’t see the stripes that are characteristic of Saturn at deeper levels, and that’s because this particular wavelength that we chose is a wavelength where the methane gas in Saturn’s atmosphere absorbs almost all the sunlight that’s falling upon it, so it looks really, really dark.”
The picture is predicated on near-infrared observations of the planet, and JWST’s infrared detectors will, Fletcher hopes, reveal small and faint buildings in Saturn’s ambiance, rings and moons missed by earlier missions, such because the Cassini spacecraft. Cassini final photographed Saturn in 2017, and the planet has since begun to tilt its rings towards Earth in an edge-on formation as a part of its 30-year orbit, with each of its poles receiving equal quantities of daylight.
“It’s like the autumn equinox that we would have here on Earth, so it’s high time to go and take another look at the Saturn system,” says Fletcher.
Saturn’s uncommon look can also be partly brought on by infrared-sensitive aerosols excessive up in its stratosphere, which give the planet a blotchy look relatively than its typical banded construction, says Fletcher. The vibrant white rings are a results of the extraordinarily reflective grains of ice reflecting daylight.
The picture is a nonetheless publicity of Saturn, which Fletcher and his colleagues will use as a comparability level to assist them determine what’s what in later photos of the planet. It can even assist them research a protracted publicity of Saturn and its environment, akin to a really quick film, in order that smaller shifting objects and buildings may be recognized, equivalent to its extra minor moons.
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Source: www.newscientist.com