Upsilon Tauri
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 26m 18.5s |
| Declination | +22° 48' 49" |
| Apparent magnitude (V) | +4.28 |
| Distance | 155 ± 6 ly (47 ± 2 pc) |
| Spectral type | A8Vn |
| Other designations | |
Upsilon Tauri (υ Tau, υ Tauri) is a triple star system in the constellation Taurus and a member of the Hyades star cluster. It is approximately 155 light years from Earth.
The primary component, Upsilon Tauri A, is a white A-type main sequence dwarf with a mean apparent magnitude of +4.28. It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.28 to +4.31 with a period of 3.56 hours. It is also a spectroscopic binary, and is composed of two stars with apparent magnitudes of +4.4 and +6.5 which are separated by 0.02 arcseconds, or at least 1 Astronomical Unit. A third star, 12th magnitude in brightness, orbits the pair with a separation of 110 arcseconds.
Occasionally this star system shares the Bayer designation υ Tauri with 72 Tauri, which is separated from it by 0.29° in the sky. 72 Tauri is not a member of the Hyades cluster, being three times farther away from Earth.