position:rosetta spacecraft operations manager

  • ESA Hangout : Preparing for #Rosetta’s grand finale
    http://blogs.esa.int/rosetta/2016/09/15/esa-hangout-preparing-for-rosettas-grand-finale

    ESA’s #rosetta spacecraft is set to complete its incredible mission in a controlled descent to the surface of Comet 67P/C-G on 30 September. Join mission experts on 19 September, 1200 GMT / 1400 CEST to discuss Rosetta’s final days and hours of operation, including expectations for the images and other scientific data that will be collected as the spacecraft gets closer and closer to the surface. We’ll also discuss the exciting discovery of Philae that was made earlier this month. Watch it live here: https://www.youtube.com/watch?v=x9lIPUjFe40

    Guests: Andrea Accomazzo, Flight #Operations director Sylvain Lodiot, Rosetta spacecraft operations manager Claire Vallet or Richard Moissl (TBC), Rosetta #Science ground segment liaison scientist Laurence O’Rourke, Rosetta downlink #science operations (...)

    #media ##CometLanding #trajectory

  • #Rosetta safe mode 5 km from #comet
    http://blogs.esa.int/rosetta/2016/05/30/rosetta-safe-mode-5-km-from-comet

    Over the weekend, #rosetta experienced a ‘safe mode’ event 5 km from the surface of Comet 67P/Churyumov-Gerasimenko. Contact with the spacecraft has since been recovered and the mission teams are working to resume normal #Operations. “We lost contact with the spacecraft on Saturday evening for nearly 24 hours,” says Patrick Martin, ESA’s Rosetta mission manager. “Preliminary analysis by our flight dynamics team suggests that the star trackers locked on to a false star – that is, they were confused by comet #dust close to the comet, as has been experienced before in the mission.” This led to spacecraft pointing errors, which triggered the safe mode. Unfortunately the star trackers then got hung in a particular sub mode requiring specific action from Earth to recover the spacecraft. “It was an (...)

    #Comets #Estrack/DSN #esoc #estrack #trajectory

    • It was an extremely dramatic weekend,” says Sylvain Lodiot, ESA’s Rosetta spacecraft operations manager.

      After we lost contact, we sent commands ‘in the blind’, which successfully tackled the hung star tracker issue and brought the spacecraft back into three-axis stabilised safe mode, and we now have contact with the spacecraft again. However, we are still trying to confirm the spacecraft’s exact position along its orbit around the comet – we only received images for navigation this morning, the first since Saturday.
      […]
      Operating close to the comet means that the spacecraft is surrounded by a lot of dust. Even though the comet’s activity has diminished significantly since passing through its closest point to the Sun along its orbit last August, the environment is still dusty enough that the star trackers can occasionally mistake comet debris in its field of view for stars.
      […]
      Details of Rosetta’s final descent will be provided soon. The provisional plan is to target the small lobe close to Philae’s original planned landing site at Agilkia, most likely on 30 September.

    • Tchourioumov-Guérassimenko à 1 pixel = 13 cm


      OSIRIS narrow-angle camera image taken in the morning of 28 May 2016 (many hours before the safe mode) when Rosetta was 7.05 km from the centre of Comet 67P/Churyumov–Gerasimenko. The scale is 0.13 m/pixel.
      Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA