pericentre

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pericentre

(ˈpɛrɪˌsɛntə) or

pericenter

n
(Astronomy) the point in an elliptical orbit that is nearest to the centre of mass of the system
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S2 will reach pericenter around 2018, and the effect it has (or doesn't have) on the hot gas surrounding the black hole could reveal much about the environment and, potentially, why G2 behaved the way it did during its pass.
The ionized gas at the head of the cloud is now stretched over more than 150 light-hours (about 160 billion kilometers) at the pericenter of the orbit around the black hole, with the closest approach being about 25 light-hours (or a bit more than 25 billion kilometers)," Stefan Gillessen from MPE, who led the observing team, said.