FU Tauri is a binary brown dwarf in the constellation of Taurus. Based on parallax measurements, it is about away.
Variability
FU Tauri varies in brightness. The primary is a T Tauri variable, a type of irregular pre-main-sequence star. Its brightness has been observed to vary from a photovisual magnitude of 16.0 to fainter than 17.0. Its photographic magnitude has been measured to vary between magnitude 15.1 and below magnitude 17.6.
Characteristics The primary and secondary, FU Tauri A and B, have spectral types of M7.25 and M9.25, which are suggestive of masses of 0.05 and 0.015 solar masses (). The system is very young, only ~1 million years old. Both brown dwarfs have infrared emission that indicates the presence of circumstellar disks. The binary system has a projected separation of , which is equivalent to a projected separation of at the system's distance.
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