On December 29, 2018, the key point of the student satellite mission of the Warsaw University of Technology (PW) was completed. Within experiment schedule the deorbiting sail received sent signal and was unfolded.

The unfolding of the sail took place earlier than planned. This reason was a warning from the US office regarding the tracking of space debris with a facility threatening the PW-Sat2 satellite. On December 27, 2018, the object marked SCC # 39841 passed PW-Sat2 at a speed of about 3.6 km / s, at a distance of only 79 meters.

A deorbite sail increases the aerodynamic resistance of the satellite, and thus it will reduce its velocity in orbit. Later, the satellite will fall lower, until it finally burns in the atmosphere of the Earth. According to Warsaw students, this should happen within 12 months. A satellite without a deorbiting sail would have been in orbit for up to 20 years.