This is the clutch that protects one of the shuttle's steering motors during launch, and has no role during landing. In the end it should take place as planned tomorrow at quarter to six in the evening
20: 00 Update

After we reported to you about an hour and a half ago about a drama in a bone cavity, we will take off from the shuttle Discovery Space.com reports that the object that moved away from the shuttle has been detected. It is a part of one of the shuttle's brakes that protects it from the heat during launch, and is not required for landing.
NASA emphasizes that the fall of the shuttle does not pose any risk to the planned landing tomorrow at 18:15 Israel time. This is what the control center told the crew on the shuttle.
"We are confident that this will not have an impact on atmospheric entry," astronaut Terry Wirts radioed crew members, adding that such hugs have occurred on many shuttle missions, including the first flight of the shuttle Columbia STS-1 in 1981.
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I join in the hope that he will pass safely, this is part of the risk in sending humans into space.
This is said to be more luck than intelligence.
Let's hope that this is the only problem, that they will land safely and that afterwards they will set up a commission of inquiry.