The ESA web portal published an article announcing the ATV-3 undocking and highlighting its mission success so far:

ESA’s ATV Edoardo Amaldi’s time is near. Next week the spacecraft will undock from the International Space Station and burn up in Earth’s atmosphere, its hugely successful mission coming to an end six months after launch.

ATV Edoardo Amaldi will undock during the night of 25/26 September, and, just 24 hours later, will be commanded to perform a controlled destructive re-entry high over an uninhabited area of the South Pacific.

 Read more on ESA portal…