Upsilon Tauri (υ Tauri) is a solitary, white-hued

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

in the zodiac constellation of Taurus, and is a member of the Hyades

star cluster Star clusters are large groups of stars. Two main types of star clusters can be distinguished: globular clusters are tight groups of ten thousand to millions of old stars which are gravitationally bound, while open clusters are more loosely clust ...

. It is faintly visible to the naked eye with an apparent visual magnitude of +4.3. Based upon an annual parallax shift of 21.21

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seen from Earth, it is around 154

light year A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 ...

s from the Sun.

Properties

This is an A-type main sequence star with a

stellar classification In astronomy, stellar classification is the classification of stars based on their stellar spectrum, spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a Prism (optics), prism or diffraction grati ...

of A8 Vn. 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. At an estimated age of 827 million years, it is spinning rapidly with a rotation period of just 0.415 days. This is giving the star an oblate shape with an equatorial bulge that is 9% larger than the polar radius. Occasionally this star system shares the

Bayer designation A Bayer designation is a stellar designation in which a specific star is identified by a Greek or Latin letter followed by the genitive form of its parent constellation's Latin name. The original list of Bayer designations contained 1,564 stars. ...

''υ Tauri'' with 72 Tauri, which is separated from it by 0.29° in the sky.

Naming

With φ, κ¹, κ² and χ, it composed the Arabic were the Arabs' ''Al Kalbain'', the Two Dogs. According to the catalogue of stars in the ''Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars'', ''Al Kalbain'' were the title for five stars : φ as ''Alkalbain I'', χ as ''Alkalbain II'', κ¹ as ''Alkalbain III'', κ² as ''Alkalbain IV'' and this star (υ) as ''Alkalbain V''.

References

{{DEFAULTSORT:Upsilon Tauri Delta Scuti variables A-type main-sequence stars Hyades (star cluster) Tauri, Upsilon Taurus (constellation) Durchmusterung objects Tauri, 069 020711 028024

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