{"id":6576,"date":"2014-02-21T15:35:13","date_gmt":"2014-02-21T15:35:13","guid":{"rendered":"http:\/\/hobbyspace.com\/Blog\/?p=6576"},"modified":"2014-02-23T00:45:59","modified_gmt":"2014-02-23T00:45:59","slug":"esa-e-deorbit-mission-would-capture-and-deorbit-a-derelict-satellite","status":"publish","type":"post","link":"https:\/\/hobbyspace.com\/Blog\/?p=6576","title":{"rendered":"ESA e.DeOrbit mission would capture and deorbit a derelict satellite"},"content":{"rendered":"

Here’s an item from ESA about an initiative to clean up space debris:<\/p>\n

How to catch a satellite\u00a0<\/a><\/strong><\/p>\n

21 February 2014:<\/strong>\u00a0Standard space dockings are difficult enough, but a future ESA mission plans to capture derelict satellites adrift in orbit. Part of an effort to control space debris, the shopping list of new technologies this ambitious mission requires is set for discussion with industry experts.<\/p>\n

ESA\u2019s Clean Space initiative<\/a> is studying the e.DeOrbit mission for removing debris, aiming to reduce the environmental impact of the space industry on Earth and space alike.<\/p>\n

\"\"
\n<\/a>Netting a derelict satellite<\/em><\/p>\n

Earth\u2019s debris halo<\/b><\/p>\n

Decades of launches have left Earth surrounded by a halo of space junk: more than 17 000 trackable objects larger than a coffee cup, which threaten working missions with catastrophic collision. Even a 1\u00a0cm nut could hit with the force of a hand grenade.<\/p>\n

The only way to control the debris population across key low orbits is to remove large items such as derelict satellites and launcher upper stages.<\/p>\n

Such uncontrolled multi-tonne items are not only collision risks but also time bombs: they risk exploding due to leftover fuel or partially charged batteries heated up by orbital sunlight.<\/p>\n

The resulting debris clouds would make these vital orbits much more hazardous and expensive to use, and follow-on collisions may eventually trigger a chain reaction of break-ups.<\/p>\n

\n

\"Distribution
\n<\/a>Distribution of space debris<\/em><\/p>\n

Targeting key orbits<\/b><\/p>\n

e.DeOrbit is designed to target debris items in well-trafficked polar orbits, between 800 km to 1000 km altitude. At around 1600 kg, e.DeOrbit will be launched on ESA\u2019s Vega rocket.<\/p>\n

The first technical challenge the mission will face is to capture a massive, drifting object left in an uncertain state, which may well be tumbling rapidly. Sophisticated imaging sensors and advanced autonomous control will be essential, first to assess its condition and then approach it.<\/p>\n<\/div>\n

\n

Making rendezvous and then steady stationkeeping with the target is hard enough but then comes the really difficult part: how to secure it safely ahead of steering the combined satellite and salvage craft down for a controlled burn-up in the atmosphere?<\/p>\n

Several capture mechanisms are being studied in parallel to minimise mission risk. Throw-nets have the advantage of scalability \u2013 a large enough net can capture anything, no matter its size and attitude. Tentacles, a clamping mechanism that builds on current berthing and docking mechanisms, could allow the capture of launch adapter rings of various different satellites.<\/p>\n<\/div>\n

\n

Harpoons work no matter the target\u2019s attitude and shape, and do not require close operations. Robotic arms are another option: results from the DLR German space agency’s forthcoming DEOS orbital servicing mission will be studied with interest.<\/p>\n

Strong drivers for the platform design are not only the large amount of propellant required, but also the possible rapid tumbling of the target \u2013 only so much spin can be absorbed without the catcher craft itself going out of control.<\/p>\n

\"\"
\n<\/a>Grabbing a target<\/em><\/p>\n

Apart from deorbit options based on flexible and rigid connections, techniques are being considered for raising targets to higher orbits, including tethers and \u00a0electric propulsion.<\/p>\n

A symposium on 6 May in the Netherlands will cover studies and technology developments related to e.DeOrbit, with ESA and space industry representatives presenting their research and outlining their plans. For further information, or to register, go\u00a0here<\/a>.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Here’s an item from ESA about an initiative to clean up space debris: How to catch a satellite\u00a0 21 February 2014:\u00a0Standard space dockings are difficult enough, but a future ESA mission plans to capture derelict satellites adrift in orbit. Part of an effort to control space debris, the shopping list of new technologies this ambitious … Continue reading ESA e.DeOrbit mission would capture and deorbit a derelict satellite<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[15,88,26],"tags":[],"class_list":["post-6576","post","type-post","status-publish","format-standard","hentry","category-in-space-infrastructure","category-space-debris","category-space-systems"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p34aWK-1I4","jetpack-related-posts":[{"id":1899,"url":"https:\/\/hobbyspace.com\/Blog\/?p=1899","url_meta":{"origin":6576,"position":0},"title":"ESA conference on space debris finds consensus on need to act","author":"TopSpacer","date":"April 26, 2013","format":false,"excerpt":"An ESA sponsored conference on space debris finds a consensus on the need to act on the problem: Global experts agree action needed on space debris 25 April 2013 There is an urgent need to remove orbiting space debris and to fly satellites in the future without creating new fragments,\u2026","rel":"","context":"In "In Space Infrastructure"","block_context":{"text":"In Space Infrastructure","link":"https:\/\/hobbyspace.com\/Blog\/?cat=15"},"img":{"alt_text":"Future debris density at poles with and without active debris removal","src":"https:\/\/i0.wp.com\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2013\/04\/future_debris_density_at_poles\/12643998-1-eng-GB\/Future_debris_density_at_poles_medium.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":24700,"url":"https:\/\/hobbyspace.com\/Blog\/?p=24700","url_meta":{"origin":6576,"position":1},"title":"Astroscale and Virgin Orbit partnering on satellite servicing initiatives","author":"TopSpacer","date":"November 17, 2021","format":false,"excerpt":"This sort of announcement seems particularly\u00a0 following this week's news of a Russian anti-satellite demonstration creating thousands of new space debris objects in low earth orbit: Responsive satellite servicing and sustainable space launches get a boost through Astroscale, Virgin Orbit Partnership ASCEND Conference, Las Vegas, Nevada, Nov. 17, 2021 \u2013\u2026","rel":"","context":"In "In Space Infrastructure"","block_context":{"text":"In Space Infrastructure","link":"https:\/\/hobbyspace.com\/Blog\/?cat=15"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2021\/11\/Astroscale-ELSA-d_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2021\/11\/Astroscale-ELSA-d_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2021\/11\/Astroscale-ELSA-d_1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2021\/11\/Astroscale-ELSA-d_1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":780,"url":"https:\/\/hobbyspace.com\/Blog\/?p=780","url_meta":{"origin":6576,"position":2},"title":"UNOOSA – STSC 2013 technical presentations","author":"TopSpacer","date":"February 21, 2013","format":false,"excerpt":"Theo Pirard of the Space Information Center\/Belgium sends me a pointer to the technical presentations given at the United Nations Office for Outer Space Affairs's Scientific and Technical Subcommittee: 2013 50th Session (STSC 2013) going on this month (11-22 February) Some samples: The Phoenix Project - 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