| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 28m 34.5s |
| Declination | +15° 57' 44" |
| Apparent magnitude (V) | +3.84 |
| Distance | 153 ± 8 ly (47 ± 3 pc) |
| Spectral type | K0IIIbFe-0.5 |
| Other designations | |
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 28m 39.7s |
| Declination | +15° 52' 15" |
| Apparent magnitude (V) | +3.40 |
| Distance | 155 ± 8 ly (47 ± 3 pc) |
| Spectral type | A7III |
| Other designations | |
Theta Tauri (θ Tau / θ Tauri) is a star system in the constellation Taurus and a member of the Hyades open cluster. It is approximately 155 light years from Earth. θ¹ Tauri has the tradiational name Phaeo (Greek Φαιω), and θ² Tauri has the traditional name Phaesula (Greek Φαισυλα), both of which were among the seven Hyades sisters.
The system is dominated by two 3rd magnitude stars, θ¹ Tauri and θ² Tauri, which are separated by 5.62 arcminutes (0.094°) on the sky. θ¹ Tauri is the dimmer component, an orange K-type giant with an apparent magnitude of +3.84. θ² Tauri is a white A-type giant with a mean apparent magnitude of +3.40. θ² Tauri is classified as a Delta Scuti type variable star and its brightness varies from magnitude +3.35 to +3.42 with a period of 1.82 hours.
Both bright stars are spectroscopic binaries and have at least one closer companion. θ¹ Tauri has a 7th magnitude companion 0.082 arcseconds, or at least 4 Astronomical Units (AU), away from the primary. θ² has a 6th magnitude companion 0.005 arcseconds, or at least 2 AU, distant. It completes an orbit once ever 141 days.
References
- "HD 28307 -- Star in double system". SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=theta1+tauri&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2005&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=2000.0&Equi2=1950.0&Equi3=2000.0&Epoch1=2000.0&Epoch2=1950.0&Epoch3=2000.0. Retrieved 2007-01-25.
- "HD 28319 -- Variable Star". SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=theta2+tauri&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2005&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=2000.0&Equi2=1950.0&Equi3=2000.0&Epoch1=2000.0&Epoch2=1950.0&Epoch3=2000.0. Retrieved 2007-01-25.
External links
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