GG Tauri, often abbreviated as GG Tau, is a quintuple star system in the constellation Taurus. At a distance of about 450 light years (140 parsecs) away, it is located within the Taurus-Auriga Star Forming Region. The system comprises three stars orbiting each other in a hierarchical triple system, known as GG Tauri A, and another binary star system more distant from the central system, known as GG Tauri B. The system is unusual because it contains two distinct circumstellar disks: one surrounding the entirety of GG Tauri A, and another surrounding the brightest star of GG Tauri A. Its large size and close distance make it ideal to study how exoplanets form within multiple star systems. Properties GG Tauri consists of five stars, which are T Tauri stars – a class of variable stars that show irregular changes in brightness. These stars are extremely young and more luminous than their main sequence counterparts, because they have not condensed into the normal size yet. The four components of GG Tauri stars are relatively cool K-type or M-type stars, with these spectral types: K7 for GG Tauri Aa, M0.5 for GG Tauri Ab, M5 for GG Tauri Ba, and M7 for GG Tauri Bb; the age of the system is estimated to be 1.5 million years. A dynamical study of the system found the masses of the four components to be: for GG Tauri Aa, for GG Tauri Ab, for GG Tauri Ba, and for GG Tauri Bb. At , GG Tauri Bb has a substellar mass and is a brown dwarf. Orbital motion has been detected in the central system (Aa and Ab), but not in the outer pair Ba and Bb (as its orbital period is too long). A preliminary orbit for GG Tauri Aa and Ab has been calculated, but is not very well constrained. The orbit is moderately eccentric; Some studies have determined that their orbit has a semimajor axis of about 34 au and is misaligned to the circumbinary disk by about 25 degrees. However, other studies have found the orbit to be coplanar to the circumbinary disk, with a larger semimajor axis of about 60 au. Interferometric techniques have been used to observe GG Tauri Ab, the lower-mass component of the central system. GG Tauri Ab was found to be a binary star system comprising two red dwarfs (Ab1 = M2V, Ab2 = M3V), with