STS-125

j'ai réussi à suivre l'EVA 1 de temps en temps: la précision avec laquelle ils retiraient et remettaient l'ancienne et la nouvelle caméras dans son emplacement, était très spectaculaire ...

la 4è EVA semble se dérouler très bien avec des tâches pas évidentes notamment dévisser 111 boulons de différentes tailles qui risquent de s'"échapper" car pas prévus au départ pour être démontés

et aujourd'hui ... on remet ça!

Dominique M. a écrit:

et aujourd'hui ... on remet ça!

Quel est le programme ?

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Spacewalkers Successfully Complete Battery Installation
Mon, 18 May 2009 03:50:40 PM GMT+0200

We now are 1 hours, 27 minutes into today's spacewalk.

Grunsfeld and Feustel have successfully completed the battery installation task. They next will remove and replace one of Hubble's three Fine Guidance Sensors, FGS-2.

To remove the old sensor, Grunsfeld and Feustel will work together to unhook nine connectors. Then Grunsfeld will release one latch and install a handle on the equipment that he’ll use to carefully lift the sensor out of the telescope. He’ll carry it to a protective enclosure inside the shuttle’s cargo bay, where Feustel will be waiting to assist him in storing it and removing the new sensor. Grunsfeld will carry the new sensor back to the worksite, slide it into place and engage its one latch. Then he’ll work with Feustel to hook up its nine connectors.

The sensors are used to provide pointing information for the spacecraft. The sensors also serve as a scientific instrument for determining the precise position and motion of stars, known as astrometry. The three Fine Guidance Sensors can hold the telescope steady for scientific observations over long periods of time. The system serves as the telescope’s pointing control system and has a precision comparable to being able to hold a laser beam focused on a dime 200 miles away, the distance from Washington D.C. to New York City.

Source NASA