Brγ line evolution of D9 between 2005 and 2019 observed with SINFONI. D9 can be identified in every epoch with a proper motion of about 250 km s⁻¹. The related distance of D9 and the LOS velocity is listed in Table 4. Sgr A* is marked with a green cross (×). Here, north is up and east is to the left. For the epoch representing 2015 and 2016, there are remnants to the north of D9, which are related to insufficient instrument response of the observations.