This morning, @ESA's #Aeolus Earth observation satellite fired its thrusters, moving it off a collision course with a @SpaceX satellite in their #Starlink constellationpic.twitter.com/bn2GHnSoFI
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For the first time ever, ESA has performed a 'collision avoidance manoeuvre' to protect one of its satellites from colliding with a 'mega constellation'
#SpaceTrafficpic.twitter.com/kmXvAgpj1U
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Experts in our
#SpaceDebris team calculated the risk of collision between these two active satellites, determining the safest option for#Aeolus would be to increase its altitude and pass over the@SpaceX satellite#CollisionAvoidancepic.twitter.com/5FEKCEvRbY
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The manoeuvre took place about 1/2 an orbit before the potential collision. Not long after the collision was expected,
#Aeolus called home as usual to send back its science data – proving the manoeuvre was successful and a collision was indeed avoidedpic.twitter.com/flYGDwFQ57Diesen Thread anzeigen -
It is very rare to perform collision avoidance manoeuvres with active satellites. The vast majority of ESA avoidance manoeuvres are the result of dead satellites or fragments from previous collisions
#SpaceDebrispic.twitter.com/mjbdoFfCPaDiesen Thread anzeigen -
In 2018, ESA performed 28
#collisionavoidance manoeuvres across its fleet. See for example a 2018 manoeuvre by@ESA_Cryosat:https://twitter.com/esaoperations/status/1016643870795485185?lang=en …
Yesterday, for the 2nd time this year, teams@esa's@ESA_EO control room altered the path of#CryoSat
preventing a collision with an unknown object. Chances of collision went 
1/10000 so a Collision Avoidance Manoeuvre (CAM) was performed! Image shows 3D collision plot [1/3] pic.twitter.com/VkAMPOpgpYDiesen Thread anzeigenDiesen Thread anzeigen -
These avoidance manoeuvres take a lot of time to prepare - from determining the future orbital positions of all functioning spacecraft, to calculating the risk of collision and potential outcomes of different actions
Inside ESA's #SpaceDebris Officepic.twitter.com/VKPQKRjUD8
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As the number of satellites in orbit increases, due to 'mega constellations' such as
#Starlink comprising hundreds or even thousands of satellites, today's 'manual' collision avoidance process will become impossible...pic.twitter.com/maeErKhBjr
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ESA is preparing to automate this process using
#AI#ArtificialIntelligence. From the initial assessment of a potential collision to a satellite moving out of the way, automated systems are becoming necessary to protect our space infrastructure#SpaceSafety#SpaceTrafficpic.twitter.com/4Wv9cuNfmLDiesen Thread anzeigen -
ESA's future will be decided at this year's ministerial council in November. Find out more about the Agency's
#SpaceSafety proposal here: http://blogs.esa.int/space19plus/programmes/space-debris/ … and stay tuned for a machine learning competition in which you can play with ESA's#spacedebris data!#Space19pluspic.twitter.com/wx2KVN2c4q
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More details will follow on the ESA website: http://www.esa.int
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