Granularity in the mass distribution around Sagittarius A* can perturb S2's orbit enough that the 2026 apocenter passage may reveal stellar-mass black holes, with simulated astrometric residuals exceeding GRAVITY's 30 microarcsecond accuracy in 35-60% of scenarios.
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Impact of a granular mass distribution on the orbit of S2 in the Galactic center
Granularity in the mass distribution around Sagittarius A* can perturb S2's orbit enough that the 2026 apocenter passage may reveal stellar-mass black holes, with simulated astrometric residuals exceeding GRAVITY's 30 microarcsecond accuracy in 35-60% of scenarios.