Delta Tauri
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 22m 56.1s |
| Declination | +17° 32' 33" |
| Apparent magnitude (V) | +3.77 |
| Distance | 153 ± 7 ly (47 ± 2 pc) |
| Spectral type | K0-IIICN0.5 |
| Other designations | |
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 24m 05.8s |
| Declination | +17° 26' 38" |
| Apparent magnitude (V) | +4.80 |
| Distance | 146 ± 6 ly (45 ± 2 pc) |
| Spectral type | A7V |
| Other designations | |
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 25m 29.4s |
| Declination | +17° 55' 41" |
| Apparent magnitude (V) | +4.30 |
| Distance | 148 ± 5 ly (45 ± 2 pc) |
| Spectral type | A2IV |
| Other designations | |
The Bayer designation Delta Tauri (δ Tau, δ Tauri) is shared by three star systems in the constellation Taurus. They are all members of the Hyades star cluster.
Because they are close to the ecliptic, these stars can be occulted by the Moon and, very rarely, by planets. The last occultation of δ¹ Tauri by a planet took place on 3 January 1818, when it was occulted by Venus.
δ¹ Tauri is a triple star approximately 153 light years from Earth and has the traditional name Hyadum II, which is Latin for "Second Hyad". No other traditional names are associated to it.
The primary component, Delta-1 Tauri A, is an orange K-type giant with an apparent magnitude of +3.77. Delta-1 has a luminosity of 74 times that of the Sun and a radius of 11.6 times solar. Its mass is calculated to be 2.6 solar masses. The surface temperature of this star is 4965 kelvins. Its companion, Delta-1 Tauri B, is a 12th magnitude star separated by 107 arcseconds from the primary. It is most likely not physically related to the main star. However, observations of lunar occultations of this star has revealed a much closer, physically related, star that orbits the main star in an eccentric orbit with an average distance of 1.76 AU. This companion takes about 530 days (1.45 Years) to orbit the main star.
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