{"id":14685,"date":"2017-04-28T01:08:37","date_gmt":"2017-04-27T17:08:37","guid":{"rendered":"https:\/\/wp-productionenv-bjg9h2g2bgg5b8aa.southeastasia-01.azurewebsites.net\/news\/cassini-contacts-earth-after-flying-inside-saturns-rings\/"},"modified":"2017-04-28T01:08:37","modified_gmt":"2017-04-27T17:08:37","slug":"cassini-contacts-earth-after-flying-inside-saturns-rings","status":"publish","type":"post","link":"https:\/\/starpath.global\/news\/cassini-contacts-earth-after-flying-inside-saturns-rings\/","title":{"rendered":"Cassini contacts Earth after flying inside Saturn\u2019s rings"},"content":{"rendered":"
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This unprocessed image shows features in Saturn\u2019s atmosphere from closer than ever before. The view of Saturn\u2019s pool hurricane was captured by NASA\u2019s Cassini spacecraft during its first \u201cGrand Finale\u201d dive past the planet on April 26, 2017. Credit: NASA\/JPL-Caltech\/Space Science Institute<\/figcaption><\/figure>\n

Ground controllers at NASA\u2019s Jet Propulsion Laboratory confirmed Thursday the Cassini spacecraft survived its first trip between Saturn and its rings, the closest any probe has ever come to the planet.<\/p>\n

Cassini was out of contact with Earth as the spacecraft passed inside Saturn\u2019s rings at 0900 GMT (5 a.m. EDT) Wednesday, using its high-gain dish antenna as a shield against icy particles engineers feared could lurk in its path.<\/p>\n

The spacecraft radioed home around 0700 GMT (3 a.m. EDT) Thursday, around 22 hours after zipping between Saturn\u2019s D ring and the planet\u2019s cloud tops at a relative speed of about 77,000 mph (124,000 kilometers per hour), fast enough to travel from New York to Los Angeles in less than two minutes.<\/p>\n

\u201cIn the grandest tradition of exploration, NASA\u2019s Cassini spacecraft has once again blazed a trail, showing us new wonders and demonstrating where our curiosity can take us if we dare,\u201d said Jim Green, director of NASA\u2019s planetary science division.<\/p>\n

A 230-foot (70-meter) antenna at NASA\u2019s Deep Space Network facility in Goldstone, California, received the first signal from Cassini early Thursday.<\/p>\n

Engineers were confident the spacecraft would make the trek through the ring gap unscathed. The trajectory took Cassini around 200 miles (300 kilometers) from the visible edge of Saturn\u2019s innermost D ring, and pictures showed no sign of any icy ring particles in the craft\u2019s path.<\/p>\n

Models suggested that if any particles were present where Cassini flew, they would be similar in size to microscopic smoke particles, according to NASA.<\/p>\n

But managers took no chances with Wednesday\u2019s flyby, pivoting the spacecraft to point its 13-foot (4-meter) radio antenna in its direction of travel to take the brunt of any debris impacts, which could have damaged or destroyed the probe.<\/p>\n

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This illustration shows NASA\u2019s Cassini spacecraft about to make one of its dives between Saturn and its innermost rings as part of the mission\u2019s Grand Finale. Credit: NASA\/JPL-Caltech<\/figcaption><\/figure>\n

\u201cNo spacecraft has ever been this close to Saturn before. We could only rely on predictions, based on our experience with Saturn\u2019s other rings, of what we thought this gap between the rings and Saturn would be like,\u201d Earl Maize, Cassini project manager at NASA\u2019s Jet Propulsion Laboratory in California. \u201cI am delighted to report that Cassini shot through the gap just as we planned and has come out the other side in excellent shape.\u201d<\/p>\n

Cassini\u2019s closest approach to Saturn came at a distance of about 1,900 miles (3,000 kilometers) from the planet\u2019s cloud tops.<\/p>\n

The long-lived space probe is in the final months of a 20-year mission, heading for a Sept. 15 crushing plunge into Saturn\u2019s atmosphere as it runs on low on fuel. Cassini will make similar flights between Saturn and its rings once per week until the destructive dive in September, with the next ring passage set for May 2.<\/p>\n

\u201cThe gap between Saturn and its rings is no longer unexplored space \u2013 and we\u2019re going back 21 times,\u201d NASA tweeted from the Cassini mission\u2019s official Twitter account.<\/p>\n

One of Cassini\u2019s instruments, the radio and plasma wave subsystem, was programmed to collect data on the size and density of ring particles encountered by the spacecraft during Wednesday\u2019s approach.<\/p>\n

Other scientific objectives planned around Wednesday\u2019s flyby included creating a high-resolution near-infrared movie of Saturn\u2019s north pole, giving scientists their best view of the motion of a mysterious six-sided cloud pattern first observed by NASA\u2019s Voyager probes in the early 1980s.<\/p>\n

Cassini\u2019s cameras were to capture a series of images of features in Saturn\u2019s atmosphere, scientists said, returning views 10 times sharper than previously available.<\/p>\n

Raw imagery from the Cassini cameras were downlinked to Earth early Thursday, showing parts of Saturn\u2019s hexagonal hurricane at the north pole, and other atmospheric features.<\/p>\n

During Cassini\u2019s next trip near Saturn on May 2, the spacecraft\u2019s science instruments will look at ringlets embedded within the main rings while the sun is hidden behind the planet, a viewing geometry that makes faint ring features more visible. Cassini will also conduct long-range observations of Saturn\u2019s moon Rhea and calibrate the craft\u2019s magnetometer for future magnetic field investigations.<\/p>\n

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The blue arcs represent Cassini\u2019s orbits through Saturn\u2019s ring gap. Credit: NASA\/JPL-Caltech<\/figcaption><\/figure>\n

Cassini will again use its antenna as a shield on four future passes near Saturn from late May through early July when the spacecraft will come closest to the D ring, the innermost of the planet\u2019s main rings. The exact placement of Cassini\u2019s journey through the ring gap changes with each orbit.<\/p>\n

Launched from Cape Canaveral on top of a Titan 4 rocket Oct. 15, 1997, the Cassini spacecraft arrived in orbit around Saturn on July 1, 2004, to begin a planned four-year tour of the planet\u2019s moons.<\/p>\n

NASA extended the nearly $3.3 billion Cassini mission multiple times, and officials in 2010 announced plans for the spacecraft to jump inside Saturn\u2019s rings this year before heading into the atmosphere in September.<\/p>\n

Cassini got a gravitational nudge from Saturn\u2019s largest moon Titan on Saturday, reshaping the craft\u2019s trajectory to begin flying inside the rings. Saturday\u2019s flyby with Titan was the mission\u2019s last opportunity to see the moon close-up.<\/p>\n

Scientists will use Cassini\u2019s final 22 orbits to measure the mass of Saturn\u2019s rings for the first time, inspect the planet\u2019s atmosphere, and derive Saturn\u2019s interior structure by studying its gravity field.<\/p>\n

\u201cOne of the things we can do with the rings is, in the grand finale orbits, for the first time address the question of the origin and the age of the rings,\u201d said Linda Spilker, Cassini project scientist at JPL. \u201cWe\u2019ll do this by measuring the mass of the rings very accurately.<\/p>\n

\u201cIf the rings are a lot more massive than we expect, perhaps they\u2019re old, as old as Saturn itself, and they\u2019ve been massive enough to survive the micrometeoroid bombardment and erosion and leave us with the rings we see today,\u201d she said. \u201cNow, on the other hand, if the rings are less massive, perhaps they\u2019re very young, maybe forming as little as 100 million years ago. Maybe a comet or a moon got too close, got torn apart by Saturn\u2019s gravity and we have the rings that we see today.\u201d<\/p>\n

Email the author.<\/i><\/b><\/p>\n

Follow Stephen Clark on Twitter: @StephenClark1.<\/strong><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

This unprocessed image shows features in Saturn\u2019s atmosphere from closer than ever before. The view of Saturn\u2019s pool hurricane was captured by NASA\u2019s Cassini spacecraft during its first \u201cGrand Finale\u201d dive past the planet on April 26, 2017. Credit: NASA\/JPL-Caltech\/Space Science Institute Ground controllers at NASA\u2019s Jet Propulsion Laboratory confirmed Thursday the Cassini spacecraft survived […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[2],"tags":[2394,1183,1561,1562],"class_list":["post-14685","post","type-post","status-publish","format-standard","hentry","category-news","tag-cassini","tag-jet-propulsion-laboratory","tag-planetary-science","tag-saturn"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/14685"}],"collection":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/comments?post=14685"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/14685\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=14685"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=14685"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=14685"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}