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Fig. A.1

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Ks-band identification of the DSO. We show the relative positions of the stars S23, S57, S54, S63 and the DSO over the years 2002−2012 in comparison with Ks-band Lucy-deconvolved images. The measuring uncertainties range between 13 mas and 25 mas. We show the results of the model calculation (left) with the location of the sources on their sky-projected track (dot interval 0.5 years; 1999−2006.5 in blue, 2007−2012 in red), an image of the model with the sources indicated by red circles (middle; image size is 380 mas  ×  380 mas), and a deconvolved Ks-band image with the modeled image section overlayed (right). For the years 2006/7 to 2012 a source can clearly be identified at the L′-band position of the DSO. The position of SgrA* is indicated by a red asterix. In the years 2002 to 2005 the DSO is confused with S63. In 2006−2008 it emerges from the confusion and shows up between the stars S23, S63, and S54 just north of S63. For 2009, 2011, 2012 the mK = 18.9 source cannot be clearly identified. This is to a large part due to the stronger crowding at the center and to the limited data quality.

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