GG Tau

GG Tau (or GG Tauri) is a star system combining a number of characteristics that make it useful for study. It is a quadruple system made up of two binary stars, and for being binaries, more accurate mass estimates can be made than otherwise. It includes a T-Tauri star, and the entire system is surrounded by a massive circumstellar disk. Being close enough for good observation, it is of interest regarding planet formation theories and study. Characteristics of GG Tau Aa:

• Taurus - constellation.
• 04h32m30.31s - right ascension.
• +17deg31m41.0s - declination.
• +12.25 - apparent magnitude.
• 140 pc - distance.