Fig. 1

Three orbits around the supermassive black hole at the Galactic Center. Red line: orbit of the cloud as determined in Gillessen et al. (2012) (taken from Schartmann et al. 2012, G2 in their Fig. 1), in our model interpreted as the inward ejecta of highest surface brightness for the observer. Black: the orbit of the nova that produced it. Blue: the orbit of the outward ejecta, which in projection are the highest surface brightness feature of the opposite ring region, identified with the tail. The years 2013.5, 2020.5, and 2012.1 denote the pericenters of the ellipses with quite different orientation and eccentricity, the cross denotes the position of the black hole. Dashed line: line of nodes, the intersection of the common plane of all orbits and the plane of sky, inclined to each other by a nearly right angle of i = 109.6°. See text.
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