Tabby's Star, a beacon in the cosmic sea, has baffled astronomers since 2015. Its light flickered not in the rhythm of planets, but as if scattered by a storm — deep dips, sharp spikes. But amid this chaos, a smooth, nearly perfect dip was found. The eye of the storm.

The TESS telescope recorded a transit method — the passage of an unseen object across the star's disk — lasting 21 hours. The depth was 1.1%. Think of it as if a lamp in a room dimmed by one hundredth for a day. But the curve shape was symmetric, like calm waves. Such a thing had never been seen for Tabby's Star.

To understand what the shadow was, astronomers deployed the full arsenal. TESS photometry was cleaned of noise. Numerical simulation fitted the orbit. They brought in spectroscopy: the SOPHIE spectrograph measured the star's spectroscopy — its wobble due to the companion. Because of Tabby's rapid rotation, spectral lines were blurred, but the authors found a way to deconvolve them with the rotation profile, reducing errors threefold. A nearby red dwarf was ruled out: eclipses from it didn't match.

Result: a massive companion. Mass 9.4 Jupiter masses, radius 1.7 Jupiter radii. This is a borderline object — no longer quite a exoplanet, but not yet a brown dwarf (a body heavier than a planet but without hydrogen burning). Density like a planet. Orbit nearly circular, with a period of about 1030–1368 days — five possible windows. And equilibrium temperature of just 268 K (minus 5°C) — rare for transit objects.

The future promises clarity. The nearest transit windows were already caught in spring 2025. It remains to precisely catch a repeat passage in 2026–2027. But the trump card is Gaia DR4: an astrometric signal of 50 microarcseconds will directly measure the mass and orbit. Thus the eye of the storm will gain clear contours, and the chaos of Tabby's Star will fall into a coherent picture.