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Fig. 3.

image

Residual velocity c z = c(zGRzK) for the best fitting prior Keplerian Kprior (f = 0, grey) and the same orbit with f = 1 (red GRprior). Kprior was constructed from all 1992–2018 astrometric data with NACO & GRAVITY and the SINFONI data between 2004 and 2016 (open black circles). The 2017/2018 SINFONI data points (black circles with cyan shading) can then be added to test if the spectroscopic data around pericentre follow Kprior or the GRprior predicted from Kprior. The new data points near and up to pericentre, where the β2 effects in radial velocity are expected to be important, fall close to the predicted GRprior curve, and exclude the Keplerian prior orbit.

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