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A very large lobe overflow event is suggested to explain the $0.^m4$brightening observed in K band at pericenter passage of the star known as S2that orbits the Galaxy's supermassive black hole (SMBH). Known observedproperties of S2 that contribute to lobe filling are 1) the enormous massratio, $M_{SMBH}/M_{S2}$, 2) S2's fast rotation, and 3) S2's large orbitaleccentricity. Published estimates have given limiting lobe sizes of order 100to 300 $R_\odot$ but, with S2's fast rotation taken into account, the computedlobe size is much smaller, being compatible with either a main sequence OB staror a stripped evolved star. An important evolutionary consideration thatpredicts very large pericenter overflows is envelope expansion following massloss that is characteristic of highly evolved stars. Material removed by lobeoverflow at pericenter is replenished by envelope expansion as an evolved starawaits its next pericenter passage. An observational signature of lobe overflowfor upcoming pericenter passages would be appearance of emission lines as theejected gas expands and becomes optically thin.

Lobe Overflow as the Likely Cause of Pericenter Outburst in an SMBH Orbiter