Centri is the star at the center of the Centri System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields. It has a diameter of about 1,456,860 km, about 123 times that of Thuriza, and its mass (about 2×1030 kilograms, 330,000 times that of Thuriza) accounts for about 99.86% of the total mass of the Centri System. Chemically, about three quarters of Centri's mass consists of hydrogen, while the rest is mostly helium. The remainder (1.69%, which nonetheless equals 5,628 times the mass of Thuriza) consists of heavier elements, including oxygen, carbon, neon and iron, among others.

Centri formed about 4.4 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, while the rest flattened into an orbiting disk that would become the Centri System. The central mass became increasingly hot and dense, eventually initiating thermonuclear fusion in its core. Centri's stellar classification, based on spectral class, is G2V, and is informally designated as a yellow dwarf, because its visible radiation is most intense in the yellow-green portion of the spectrum and although its color is white, from the surface of the Thuriza it may appear yellow because of atmospheric scattering of blue light. In the spectral class label, G2 indicates its surface temperature of approximately 5778 K (5505 °C), and V indicates that Centri, like most stars, is a main-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, Centri fuses 620 million metric tons of hydrogen each second.

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