# Upsilon Tauri

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Not to be confused with [Y Tauri](/source/Y_Tauri).

**Upsilon Tauri** (**υ Tauri**) is a solitary,[1] white-hued [star](/source/Star) in the [zodiac](/source/Zodiac) constellation of [Taurus](/source/Taurus_(constellation)), and is a member of the [Hyades](/source/Hyades_(star_cluster)) [star cluster](/source/Open_cluster).[2] It is faintly visible to the naked eye with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of +4.3. Based upon an annual [parallax shift](/source/Stellar_parallax) of 21.21 [mas](/source/Milliarcsecond) seen from Earth, it is around 154 [light years](/source/Light_year) from the Sun.

## Properties

This is an [A-type main sequence star](/source/A-type_main_sequence_star) with a [stellar classification](/source/Stellar_classification) of A8 Vn.[3] It is classified as a [Delta Scuti type](/source/Delta_Scuti_variable) [variable star](/source/Variable_star) and its brightness varies from magnitude +4.28 to +4.31 with a period of 3.56 hours.[4] At an estimated age of 827 million years,[5] it is spinning rapidly with a rotation period of just 0.415 days.[2] This is giving the star an [oblate shape](/source/Oblate_spheroid) with an [equatorial bulge](/source/Equatorial_bulge) that is 9% larger than the polar radius.[6]

Occasionally this star system shares the [Bayer designation](/source/Bayer_designation) *υ Tauri* with [72 Tauri](/source/72_Tauri), which is separated from it by 0.29° in the sky.[7]

## Naming

With [φ](/source/Phi_Tauri), [κ1](/source/Kappa_Tauri), [κ2](/source/Kappa_Tauri) and [χ](/source/Chi_Tauri), it composed the Arabic were the Arabs' *Al Kalbain*, the Two Dogs.[8] 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](/source/Phi_Tauri) as *Alkalbain I*, [χ](/source/Chi_Tauri) as *Alkalbain II*, [κ1](/source/Kappa_Tauri) as *Alkalbain III*, [κ2](/source/Kappa_Tauri) as *Alkalbain IV* and this star (υ) as *Alkalbain V*.[9]

## References

1. Eggleton, P. P. & Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", *Monthly Notices of the Royal Astronomical Society*. **389** (2): 869–879, [arXiv:0806.2878](https://arxiv.org/abs/0806.2878). [Bibcode:2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E). [doi:10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111/j.1365-2966.2008.13596.x). [S2CID 14878976](https://api.semanticscholar.org/CorpusID:14878976)

1. van Saders, Jennifer L. & Pinsonneault, Marc H. (October 2013), "Fast Star, Slow Star; Old Star, Young Star: Subgiant Rotation as a Population and Stellar Physics Diagnostic", *The Astrophysical Journal*. **776** (2): 20, [arXiv:1306.3701](https://arxiv.org/abs/1306.3701). [Bibcode:2013ApJ...776...67V](https://ui.adsabs.harvard.edu/abs/2013ApJ...776...67V). [doi:10.1088/0004-637X/776/2/67](https://doi.org/10.1088/0004-637X/776/2/67). [S2CID 119097746](https://api.semanticscholar.org/CorpusID:119097746). 67

1. Royer, F. et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", *Astronomy and Astrophysics*. **463** (2): 671–682, [arXiv:astro-ph/0610785](https://arxiv.org/abs/astro-ph/0610785). [Bibcode:2007A&A...463..671R](https://ui.adsabs.harvard.edu/abs/2007A%26A...463..671R). [doi:10.1051/0004-6361:20065224](https://doi.org/10.1051/0004-6361:20065224). [S2CID 18475298](https://api.semanticscholar.org/CorpusID:18475298)

1. Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", *Astronomy Reports*. **61** (1): 80–88, 5.1, [Bibcode:2017ARep...61...80S](https://ui.adsabs.harvard.edu/abs/2017ARep...61...80S). [doi:10.1134/S1063772917010085](https://doi.org/10.1134/S1063772917010085). [S2CID 125853869](https://api.semanticscholar.org/CorpusID:125853869)

1. David, Trevor J. & Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", *The Astrophysical Journal*. **804** (2): 146, [arXiv:1501.03154](https://arxiv.org/abs/1501.03154). [Bibcode:2015ApJ...804..146D](https://ui.adsabs.harvard.edu/abs/2015ApJ...804..146D). [doi:10.1088/0004-637X/804/2/146](https://doi.org/10.1088/0004-637X/804/2/146). [S2CID 33401607](https://api.semanticscholar.org/CorpusID:33401607)

1. van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", *The Astronomy and Astrophysics Review*. **20** (1): 51, [arXiv:1204.2572](https://arxiv.org/abs/1204.2572). [Bibcode:2012A&ARv..20...51V](https://ui.adsabs.harvard.edu/abs/2012A%26ARv..20...51V). [doi:10.1007/s00159-012-0051-2](https://doi.org/10.1007/s00159-012-0051-2). [S2CID 119273474](https://api.semanticscholar.org/CorpusID:119273474)

1. Hoffleit, D. & Jaschek, C. (1991), "The Bright Star Catalogue", New Haven: Yale University Observatory, [Bibcode:1991bsc..book.....H](https://ui.adsabs.harvard.edu/abs/1991bsc..book.....H)

1. Allen, Richard Hinckley (1899), "Star-Names and Their Meanings", New York: G. E. Stechert, p. 413

1. Rhoads, Jack W. (November 15, 1971), ["Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars"](https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf), Jet Propulsion Laboratory, California Institute of Technology

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Adapted from the Wikipedia article [Upsilon Tauri](https://en.wikipedia.org/wiki/Upsilon_Tauri) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Upsilon_Tauri?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.