Since entering orbit around the comet 67P / the comet in August, Rosetta has continued to move closer to the star, from 100 km to 10 km normally today. 
The meeting of the Rosetta probe and the comet 67P / Churyumov-Gerasimenko s’ is first made by an orbiting a few hundred miles in August. While the goal of the European probe is to release the Philae current module November, Rosetta has continued to get closer since.
This is how Rosetta’s orbit gradually reduced from 100 km to 80 km distance. On September 10, taking advantage of being 30 kilometers from the nucleus, the probe has subtly maneuvered to move from elliptical to circular orbit as detailed video of the ESA. Thus, the European spacecraft flying at 30 kilometers from the comet 67P / Churyumov-Gerasimenko on September 10.
This merger was a step since Rosetta continued maneuvers to be 20 kilometers on Monday 29 September. As highlighted by the CNES, this maneuver is a unique high-risk operation.
The idea of this approximation is obviously to facilitate the release of Philae, the module that will land on the comet aware November. But until then, this proximity will primarily serve to detail the mapping of Comet 67P / Churyumov-Gerasimenko in order to validate the planned landing site for the module. For proof, one need only compare the images taken by Rosetta in different lights, different shots that can highlight many reliefs previously invisible.
If all goes well with this approximation to 20 km, another operation will then be conducted in a week in order to bring Rosetta 10 kilometers from the nucleus, a final reconciliation which will be crucial for the success of the mission
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