XZ Tauri is a binary system approximately 460 light-years away in the constellation Taurus. The system consists of two T Tauri stars orbiting each other about 6 billion kilometers apart (roughly the same distance as Pluto is from the Sun). The system made news in 2000 when a superflare was observed in the system.
Epoch J2000.0 Equinox J2000.0
|Right ascension||04h 31m 40.08690s|
|Declination||+18° 13′ 56.6424″|
|Apparent magnitude (V)||10.40|
|Spectral type||M2.0 + M3.5|
|Proper motion (μ)|| RA: 9.1 mas/yr |
Dec.: −17.8 mas/yr
|Distance||460 ly |
|Period (P)||155 yr|
|Semi-major axis (a)||0.172+0.002|
|Argument of periastron (ω)|
A third star, component C, has been observed at a separation of 0.09″, but subsequent observations failed to find it. The T Tauri star HL Tauri, 23″ away, is also sometimes listed as a companion.
An animation of the 2000 superflare in the system.