{"id":672,"date":"2014-10-17T04:00:08","date_gmt":"2014-10-17T04:00:08","guid":{"rendered":"http:\/\/revoscience.com\/en\/?p=672"},"modified":"2014-10-17T04:00:08","modified_gmt":"2014-10-17T04:00:08","slug":"esa-confirms-the-primary-landing-site-for-rosetta","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/esa-confirms-the-primary-landing-site-for-rosetta\/","title":{"rendered":"ESA confirms the primary landing site for Rosetta"},"content":{"rendered":"

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\"Philae\u2019s<\/a>
Philae\u2019s primary landing site \u2013 mosaic<\/figcaption><\/figure>\n

Paris — \u00a0<\/span>ESA has given the green light for its Rosetta mission to deliver its lander, Philae, to the primary site on 67P\/Churyumov-Gerasimenko<\/em> on\u00a0<\/span>12 November<\/span><\/span>, in the first-ever attempt at a soft touchdown on a comet.<\/span>

Philae’s landing site, currently known as Site J and located on the smaller of the comet’s two ‘lobes’, has been confirmed on 14 October following a comprehensive readiness review.<\/span>

Since the arrival, the mission has been conducting an unprecedented survey and scientific analysis of the comet, a remnant of the early phases\u00a0 of the Solar System’s 4.6 billion-year history.<\/span>

At the same time, Rosetta has been moving closer to the comet: starting at 100 km on\u00a0<\/span>6 August<\/span><\/span>, it is now just 10 km from the centre of the 4 km-wide body. This allowed a more detailed look at the primary and backup landing sites in order to complete a hazard assessment, including a detailed boulder census.<\/span>

The decision that the mission is ‘Go’ for Site J also confirms the timeline of events leading up to the landing.<\/span>

Rosetta will release Philae at\u00a0<\/span>08:35 GMT<\/span><\/span>\/09:35 CET on\u00a0<\/span>12 November<\/span><\/span>\u00a0at a distance of approximately 22.5 km from the centre of the comet. Landing will be about seven hours later at around\u00a0<\/span>15:30 GMT<\/span><\/span>\/16:30 CET.<\/span>

With a one-way signal travel time between Rosetta and Earth on\u00a0<\/span>12 November<\/span><\/span>\u00a0of 28 minutes 20 seconds, that means that confirmation of separation will arrive on Earth ground stations at\u00a0<\/span>09:03 GMT<\/span><\/span>\/10:03 CET and of touchdown at around\u00a0<\/span>16:00 GMT<\/span><\/span>\/17:00 CET.<\/span>

“Now that we know where we are definitely aiming for, we are an important step closer to carrying out this exciting – but high-risk – operation,” says Fred Jansen, ESA’s Rosetta mission manager.<\/span><\/p>\n

\"What<\/a>
What does Philae do during descent?<\/figcaption><\/figure>\n

“However, there are still a number of key milestones to complete before we can give the final Go for landing.”<\/span>

A series of Go\/No-Go decisions must be taken before separation, starting on\u00a0<\/span>11 November<\/span><\/span>\u00a0with a confirmation from the flight dynamics team that Rosetta is on the right trajectory ahead of lander delivery.<\/span>

Further Go\/No-Go decisions will be made during the night of\u00a0<\/span>11-12 November<\/span><\/span>\u00a0concerning readiness and uplink of commands, culminating in confirmation of the lander readiness for separation.<\/span>

A short manoeuvre must then take place around two hours before separation. This will set Rosetta on course to release Philae on the right trajectory to land on the comet. The final critical Go\/No-Go for separation occurs shortly after this manoeuvre.<\/span>

After the release of Philae, Rosetta will manoeuvre up and away from the comet, before reorienting itself in order to establish communications with Philae.<\/span>

“If any of the decisions result in a No-Go, then we will have to abort and revise the timeline accordingly for another attempt, making sure that Rosetta is in a safe position to try again,” says Fred Jansen.<\/span>

All being well, Rosetta and its lander will begin communications about two hours after separation.<\/span>

During the seven-hour descent, Philae will take images and conduct science experiments, sampling the dust, gas and plasma environment close to the comet.<\/span>

It will take a ‘farewell’ image of the Rosetta orbiter shortly after separation, along with a number of images as it approaches the comet surface. It is expected that the first images from this sequence will be received on Earth several hours after separation.<\/span>

Once safely on the surface, Philae will take a panorama of its surroundings. Again, this is expected back on Earth several hours later.<\/span>

The first sequence of surface<\/span><\/p>\n

experiments will begin about an hour after touchdown and will last for 64 hours, constrained by the lander’s primary battery lifetime.<\/span>

Longer-term study of the comet by Philae will depend on for how long and how well the batteries are able to recharge, which in turn is related to the amount of dust that settles on its solar panels.<\/span>

In any case, it is expected that by March 2015, as the comet moves closer in its orbit towards the Sun, temperatures inside the lander will have reached levels too high to continue operations, and Philae’s science mission will come to an end.<\/span>

The Rosetta orbiter’s mission will continue for much longer. It will accompany the comet as it grows in activity until their closest approach to the Sun in August 2015 and then as they head back towards the outer Solar System.<\/span>

This unprecedented mission will study how a comet evolves and give important insights into the formation of our Solar System, and the origins of water and perhaps even life on Earth.<\/span>

A detailed operations timeline, including key Go\/No-Go decisions leading up to separation, will be available soon.<\/span>

More about Rosetta<\/span><\/strong>

Rosetta is an ESA mission with contributions from its Member States and NASA. Rosetta’s Philae lander is provided by a consortium led by DLR, MPS, CNES, and ASI. Rosetta is the first mission in history to rendezvous with a comet. It is escorting the comet as they orbit the Sun, and will deploy a lander.<\/span>

Comets are time capsules containing primitive material left over from the epoch when the Sun and its planets formed. By studying the gas, dust and structure of the nucleus and organic materials associated with the comet, via both remote and in situ observations, the Rosetta mission should become the key to unlocking the history and evolution of our Solar System, as well as answering questions regarding the origin of Earth’s water and perhaps even life.<\/span>

About the European Space Agency<\/span><\/strong>
The European Space Agency (ESA) is Europe’ s gateway to space.<\/span>

ESA is an intergovernmental organisation, created in 1975, with the mission to shape the development of Europe’s space capability and ensure that investment in space delivers benefits to the citizens of Europe and the world.<\/span>

ESA has 20 Member States: Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, the Netherlands, Norway, Poland, Portugal, Romania, Spain, Sweden, Switzerland and the United Kingdom, of whom 18 are Member States of the EU.<\/span><\/p>\n

Note: Provided by ESA<\/a><\/p>\n

\n

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Paris — \u00a0ESA has given the green light for its Rosetta mission to deliver its lander, Philae, to the primary site on 67P\/Churyumov-Gerasimenko on\u00a012 November, in the first-ever attempt at a soft touchdown on a comet.Philae’s landing site, currently known as Site J and located on the smaller of the comet’s two ‘lobes’, has been […]<\/p>\n","protected":false},"author":2,"featured_media":675,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-672","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-space-news"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",625,351,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large-150x150.jpg",150,150,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large-300x168.jpg",300,168,true],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",625,351,false],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",625,351,false],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",625,351,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",625,351,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",625,351,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",625,351,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",600,337,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",600,337,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",625,351,false],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",550,309,false],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",95,53,false],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",625,351,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",96,54,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2014\/10\/Philae_s_primary_landing_site_mosaic_large.jpg",150,84,false]},"author_info":{"info":["RevoScience"]},"category_info":"Space\/ AstroPhysics<\/a>","tag_info":"Space\/ AstroPhysics","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/672","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/comments?post=672"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/672\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/675"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=672"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}