{"id":15259,"date":"2016-09-05T19:53:57","date_gmt":"2016-09-05T11:53:57","guid":{"rendered":"https:\/\/wp-productionenv-bjg9h2g2bgg5b8aa.southeastasia-01.azurewebsites.net\/news\/lost-philae-lander-found-on-comet\/"},"modified":"2016-09-05T19:53:57","modified_gmt":"2016-09-05T11:53:57","slug":"lost-philae-lander-found-on-comet","status":"publish","type":"post","link":"https:\/\/starpath.global\/news\/lost-philae-lander-found-on-comet\/","title":{"rendered":"Lost Philae lander found on comet"},"content":{"rendered":"
\"Rosetta\u2019s
Rosetta\u2019s lander Philae has been identified in OSIRIS narrow-angle camera images taken on Sept. 2, 2016 from a distance of 1.7 miles (2.7 kilometers). The image scale is about 2 inches (5 centimeters) per pixel. Philae\u2019s 3-foot-wide (1-meter) body and two of its three legs can be seen extended from the body. The images also provide proof of Philae\u2019s orientation.
A Rosetta Navigation Camera image taken on 16 April 2015 is shown at top right for context, with the approximate location of Philae on the small lobe of comet Churyumov-Gerasimenko marked. Credit: Main image and lander inset: ESA\/Rosetta\/MPS for OSIRIS Team MPS\/UPD\/LAM\/IAA\/SSO\/INTA\/UPM\/DASP\/IDA; context: ESA\/Rosetta\/NavCam \u2013 CC BY-SA IGO 3.0<\/figcaption><\/figure>\n

Scientists culling through images taken last week by the Rosetta spacecraft\u2019s sharp-eyed science camera have finally pinpointed the exact spot the Philae lander settled on comet 67P\/Churyumov-Gerasimenko after a daring descent nearly two years ago, the European Space Agency announced Monday.<\/p>\n

Less than a month before Rosetta ends its two-year survey of the comet, the probe\u2019s OSIRIS camera found Philae on Friday nestled amid a rugged landscape marked with boulders and cliffs. The imagery confirmed the lander is sitting on its side in the shadow of a nearby rock face, illustrating why Philae lost power from its solar panels within three days of touchdown.<\/p>\n

The lander\u2019s orientation and location also made it difficult to establish communications after Philae came out of hibernation in June 2015. Ground controllers last heard from Philae in July 2015, and then gave up hope of re-activating the comet research station earlier this year.<\/p>\n

\u201cWith only a month left of the Rosetta mission, we are so happy to have finally imaged Philae, and to see it in such amazing detail,\u201d said Cecilia Tubiana, a member of the OSIRIS imaging team.<\/p>\n

ESA said Tubiana was the first person to see the images of Philae when they were downlinked to Earth on Sunday. Rosetta\u2019s OSIRIS camera took the pictures when the craft passed within 9,000 feet (2.7 kilometers) of the duck-shaped comet.<\/p>\n

\u201cAfter months of work, with the focus and the evidence pointing more and more to this lander candidate, I\u2019m very excited and thrilled that we finally have this all-important picture of Philae sitting in Abydos,\u201d said Laurence O\u2019Rourke, coordinator of ESA\u2019s lander search team charged with finding Philae\u2019s landing site on comet 67P.<\/p>\n

Philae detached from the Rosetta mothership Nov. 12, 2014, on a slow-speed collision course with the comet. After a seven-hour descent, Philae reached the relatively flat landing zone picked by mission scientists right on target, but all three of the probe\u2019s landing aids failed to engage at touchdown.<\/p>\n

Philae carried a upward-facing rocket thruster to help push the lander on to comet 67P\u2019s surface, along with harpoons and ice screws to anchor the craft\u2019s three landing legs to the comet. None of those systems worked as designed.<\/p>\n

Comet 67P\u2019s tenuous gravity was not strong enough to keep Philae on the surface, and the probe bounced back into space and tumbled for two hours up to 0.6 miles (1 kilometer) off the jagged space rock, hitting the comet again before settling at its final resting place in a region dubbed Abydos, keeping with the Rosetta team\u2019s ancient Egyptian naming theme.<\/p>\n

But the nearly $250 million (220 million euro) lander mission, led by Germany, still returned valuable science data, the first observations ever collected from the surface of a comet.<\/p>\n

\"This
This labeled image of Philae shows several of its features visible, including two of the lander\u2019s three legs, one of its CIVA panoramic cameras, and its SD2 drilling instrument. Credit: ESA\/Rosetta\/MPS for OSIRIS Team MPS\/UPD\/LAM\/IAA\/SSO\/INTA\/UPM\/DASP\/IDA<\/figcaption><\/figure>\n

In the first three days after landing, Philae took a panoramic image, measured the composition and properties of the comet\u2019s surface, discovered organic molecules residing on the diminutive world, and conducted radio transponder experiments with Rosetta to help study the comet\u2019s interior structure.<\/p>\n

But Philae was wedged in shadow at its unexpected landing site and unable to recharge its batteries with the craft\u2019s body-mounted solar panels. The lander\u2019s batteries drained within three days.<\/p>\n

Last year, when comet 67P approached perihelion, the closest point to the sun in its nearly 6.5-year orbit, engineers restored communication with Philae as it absorbed more solar energy. But the radio links were intermittent, and Philae went silent in July 2015.<\/p>\n

Officials suggested the lander may have had a problem with its transmitter.<\/p>\n

The ground team attempted to find the lander by analyzing the radio signals bounced between Rosetta and Philae, and by taking high-resolution pictures of the comet in hopes the surface station would be visible.<\/p>\n

Philae\u2019s radio was not powerful enough to communicate directly with Earth, so Rosetta acted as a relay satellite to hand off science data and commands passing each way. The radio signals provided hints to Philae\u2019s distance from the Rosetta spacecraft parked in orbit around the comet, and experts used that information to triangulate the lander\u2019s location.<\/p>\n

It turns out Philae is sitting just where the ground team expected. But until last weekend, officials could not say for sure.<\/p>\n

\u201cThis wonderful news means that we now have the missing \u2018ground-truth\u2019 information needed to put Philae\u2019s three days of science into proper context, now that we know where that ground actually is,\u201d said Matt Taylor, ESA\u2019s Rosetta project scientist.<\/p>\n

Time was running out in the hunt for Philae. Rosetta is scheduled to make a controlled crash into the comet Sept. 30, before it also runs out of electrical power as comet 67P drives farther from the sun, where temperatures are cold and there is insufficient light to keep the spacecraft running.<\/p>\n

The comet will reach aphelion, a point beyond Jupiter\u2019s orbit too far for Rosetta\u2019s solar panels to convert enough sunlight into electricity.<\/p>\n

Mission managers concluded Sept. 30 was the best time to place Rosetta on the comet, when it still has enough electricity to make the plunge with all its science instruments turned on to gather unprecedented information on the environment within hundreds of feet of the surface.<\/p>\n

Rosetta\u2019s designers never envisioned landing the spacecraft. Fitted with two solar wings spanning 105 feet (32 meters) tip-to-tip, Rosetta will likely be damaged at touchdown \u2014 even at slow speed \u2014 and ground controllers plan to program the on-board flight computer to turn off the probe\u2019s transmitter when it reaches the comet.<\/p>\n

The complex maneuvers required to set up for Rosetta\u2019s landing at the end of September are what allowed for the up-close snapshot of Philae. The orbiter is spiraling closer and closer to comet 67P in advance of the Sept. 30 landing.<\/p>\n

Once Rosetta is gone, scientists would have no hope of ever finding Philae.<\/p>\n

\u201cThis remarkable discovery comes at the end of a long, painstaking search,\u201d said Patrick Martin, ESA\u2019s Rosetta mission manager, in a statement. \u201cWe were beginning to think that Philae would remain lost forever. It is incredible we have captured this at the final hour.\u201d<\/p>\n

Rosetta is heading for a landing target on a different section of comet 67P, where scientists discovered open pits that may be the source of jets and outbursts that launched clouds of ice and dust into space last year.<\/p>\n

\u201cNow that the lander search is finished we feel ready for Rosetta\u2019s landing, and look forward to capturing even closer images of Rosetta\u2019s touchdown site,\u201d said Holger Sierks, principal investigator of the OSIRIS camera.<\/p>\n

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

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

Rosetta\u2019s lander Philae has been identified in OSIRIS narrow-angle camera images taken on Sept. 2, 2016 from a distance of 1.7 miles (2.7 kilometers). The image scale is about 2 inches (5 centimeters) per pixel. Philae\u2019s 3-foot-wide (1-meter) body and two of its three legs can be seen extended from the body. The images also […]<\/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":[3098,2423,831,3609,1561,3373],"class_list":["post-15259","post","type-post","status-publish","format-standard","hentry","category-news","tag-comet-67p-churyumov-gerasimenko","tag-comets","tag-european-space-agency","tag-philae","tag-planetary-science","tag-rosetta"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/15259"}],"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=15259"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/15259\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=15259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=15259"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=15259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}