It says the maneuver will take about seven hours starting from the moment its unmanned probe Rosetta releases the 100-kilogram lander at 0835 GMT (0335 EST).
Because of the 28 minutes it takes the signal to travel back to Earth, confirmation of a successful landing won't arrive until about shortly after 1600 GMT (1100 EST).
ESA said in a statement Friday that it has a backup plan in case of a problem with the preferred landing site.
Scientists hope the decade-long mission to examine comet 67P/Churyumov-Gerasimenko will help them learn more about the origins and evolution of objects in the universe.
Site J was chosen unanimously over four other candidate sites as the primary landing site because the majority of terrain within a square kilometre area has slopes of less than 30º relative to the local vertical and because there are relatively few large boulders.
The area also receives sufficient daily illumination to recharge Philae and continue surface science operations beyond the initial 64-hour battery-powered phase.
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