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Home Astronomy

Within the Shadow of Saturn’s Rings

November 22, 2023
in Astronomy
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Within the Shadow of Saturn’s Rings
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I can keep in mind it very nicely, though not truly certain when it was, again round 1995/1996 I feel. I used to be, like most different eager stargazers very acquainted with the sight of Saturn with rings and all. Certainly the view of Saturn with its rings was one of many first issues I had ever seen via a telescope and it impressed me right into a lifetime ardour of exploring the night time sky. Each 15 years although, the Earth passes via the airplane of the rings and from Earth they appear to fade.  Now, an astronomer has used information taken throughout such ring airplane crossings from the Cassini spacecraft to measure the transparency of the rings.

Ring airplane crossings from Earth are fascinating however not terribly scientifically helpful. A Lancaster College PhD scholar took information from the Cassini spacecraft when it was flying via the airplane of Saturn’s rings and used the information to measure how a lot daylight handed via. The idea is sort of easy, we all know how brilliant the Solar is, can measure how brilliant it seems via the rings based mostly on its impact on devices so can measure their transparency.

The Cassini spacecraft gave us some additional particular ring airplane crossings and we didn’t have to attend 15 years between them! Cassini was launched in 1997 by NASA/ESA and arrived at Saturn about 7 years later in 2004.  It’s path appeared fairly excessive having needed to first fly by Veus, then Earth, Venus after which Jupiter earlier than finally arriving at Saturn.

Artist impression of Cassini at Saturn (Credit score : NASA/JPL)

The slightly lengthy route was deliberate to maximise gas effectivity, utilizing the gravity of different planets to slingshot the probe out to Saturn slightly than depend on bucket a great deal of gas. The mission at Saturn resulted in 2017, 13 years after its arrival however after the plucky probe plunged via the rings 22 occasions giving us 22 ring airplane crossings to check.

As Cassini dived into the shadow of Saturn and its rings, the Langmuir Probe on board the spacecraft recorded adjustments! It was designed to detect and measure chilly plasma (ions and electrons in Saturn’s magnetosphere) however because it hit shadow, there was a dramatic drop in electron manufacturing from the instrument.  When the metallic probe was in daylight it generated electrons in a course of often called the photoelectric impact but it surely was the absence of those electrons that helped to grasp the measure of optical transparency of the rings. 

The research by George Xystouris was an exquisite and ingenious option to make use of obtainable information to be taught new issues.  It considerably jogs my memory of Eratosthenes’ ingenious experiment utilizing shadows to unravel the circumference of the Earth in 2AD, science is nothing if not ingenious. 

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