# Tau1 Lupi

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Star in the constellation Lupus

For other stars with this Bayer designation, see [τ Lupi](/source/Tau_Lupi).

Tau1 Lupi Location of τ1 Lupi (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Lupus Right ascension 14h 26m 08.22424s[1] Declination −45° 13′ 17.1315″[1] Apparent magnitude (V) 4.546[2] Characteristics Spectral type B2 IV[3][2] B−V color index −0.146[2] Variable type β Cep[4] Astrometry Radial velocity (Rv) −21.5±2.8[3] km/s Proper motion (μ) RA: −13.09[1] mas/yr Dec.: −14.67[1] mas/yr Parallax (π) 2.99±0.21 mas[1] Distance 1,090 ± 80 ly (330 ± 20 pc) Absolute magnitude (MV) −3.05[5] Details Mass 9.98±0.63[2] M☉ Radius 7.1[6] R☉ Luminosity 3,831[7] L☉ Luminosity (bolometric) 11,321[2] L☉ Temperature 15,273[7] K Metallicity [Fe/H] −0.39±0.16[8] dex Rotational velocity (v sin i) 30[9] km/s Age 20.8±0.9[10] Myr Other designations τ1 Lup, CD−44°9322, FK5 1377, HD 126341, HIP 70574, HR 5395, SAO 224919[11] Database references SIMBAD data

**Tau1 Lupi**, [Latinized](/source/Latinisation_of_names) from **τ1 Lupi**, is a solitary[12] [star](/source/Star) in the southern [constellation](/source/Constellation) of [Lupus](/source/Lupus_(constellation)). It is visible to the naked eye with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.5.[2] Based upon an annual [parallax shift](/source/Stellar_parallax) of only 2.99 [mas](/source/Milliarcsecond) as seen from Earth, it is located about 1,090 [light years](/source/Light_year) from the [Sun](/source/Sun). Tau1 Lupi may be a [runaway star](/source/Runaway_star)[10] having a [peculiar velocity](/source/Peculiar_velocity) of 32.6±3.6 km/s.[3] It is a member of the Upper Centaurus–Lupus sub-group of the nearby [Sco OB2](/source/Sco_OB2) association.[13]

A  [light curve](/source/Light_curve) for Tau1 Lupi, plotted from *[TESS](/source/Transiting_Exoplanet_Survey_Satellite)* data[14]

This is a [B-type](/source/B-type_star) [subgiant star](/source/Subgiant_star) with a [stellar classification](/source/Stellar_classification) of B2 IV.[3][2] It was determined to be a [Beta Cephei variable](/source/Beta_Cephei_variable) based on observations during 1955 at the [Cape Observatory](/source/Cape_Observatory).[15] Tau1 Lupi shows a steady period of 0.17736934 days, corresponding to a frequency of 5.637953 cycles per day, with an [amplitude](/source/Amplitude) of 0.035 in visual magnitude.[4][16] It has around 10[2] times the [mass of the Sun](/source/Solar_mass) and 7[6] times the [Sun's radius](/source/Solar_radius).

The star shows an [infrared excess](/source/Infrared_excess), which is unusual for a non-[emission star](/source/Be_star) of this class. The inner edge of the dust lies at a distance of 980 [AU](/source/Astronomical_Unit) from the star with a temperature of 190 K, and it extends outward to as much as 50,000 AU where the temperature drops to 40 K. This optically thin dust is not related to the pulsational behavior of the star.[9]

## References

1. ^ [***a***](#cite_ref-vanLeeuwen2007_1-0) [***b***](#cite_ref-vanLeeuwen2007_1-1) [***c***](#cite_ref-vanLeeuwen2007_1-2) [***d***](#cite_ref-vanLeeuwen2007_1-3) [***e***](#cite_ref-vanLeeuwen2007_1-4) van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", *Astronomy and Astrophysics*, **474** (2): 653–664, [arXiv](/source/ArXiv_(identifier)):[0708.1752](https://arxiv.org/abs/0708.1752), [Bibcode](/source/Bibcode_(identifier)):[2007A&A...474..653V](https://ui.adsabs.harvard.edu/abs/2007A&A...474..653V), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078357](https://doi.org/10.1051%2F0004-6361%3A20078357), [S2CID](/source/S2CID_(identifier)) [18759600](https://api.semanticscholar.org/CorpusID:18759600).

1. ^ [***a***](#cite_ref-Hohle2010_2-0) [***b***](#cite_ref-Hohle2010_2-1) [***c***](#cite_ref-Hohle2010_2-2) [***d***](#cite_ref-Hohle2010_2-3) [***e***](#cite_ref-Hohle2010_2-4) [***f***](#cite_ref-Hohle2010_2-5) [***g***](#cite_ref-Hohle2010_2-6) [***h***](#cite_ref-Hohle2010_2-7) Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", *Astronomische Nachrichten*, **331** (4): 349, [arXiv](/source/ArXiv_(identifier)):[1003.2335](https://arxiv.org/abs/1003.2335), [Bibcode](/source/Bibcode_(identifier)):[2010AN....331..349H](https://ui.adsabs.harvard.edu/abs/2010AN....331..349H), [doi](/source/Doi_(identifier)):[10.1002/asna.200911355](https://doi.org/10.1002%2Fasna.200911355), [S2CID](/source/S2CID_(identifier)) [111387483](https://api.semanticscholar.org/CorpusID:111387483).

1. ^ [***a***](#cite_ref-Bobylev2013_3-0) [***b***](#cite_ref-Bobylev2013_3-1) [***c***](#cite_ref-Bobylev2013_3-2) [***d***](#cite_ref-Bobylev2013_3-3) Bobylev, V. V.; Bajkova, A. T. (August 2013), "Galactic kinematics from a sample of young massive stars", *Astronomy Letters*, **39** (8): 532–549, [arXiv](/source/ArXiv_(identifier)):[1307.1677](https://arxiv.org/abs/1307.1677), [Bibcode](/source/Bibcode_(identifier)):[2013AstL...39..532B](https://ui.adsabs.harvard.edu/abs/2013AstL...39..532B), [doi](/source/Doi_(identifier)):[10.1134/S106377371308001X](https://doi.org/10.1134%2FS106377371308001X), [S2CID](/source/S2CID_(identifier)) [118568203](https://api.semanticscholar.org/CorpusID:118568203).

1. ^ [***a***](#cite_ref-Cuypers1987_4-0) [***b***](#cite_ref-Cuypers1987_4-1) Cuypers, J. (June 1987), "New observations and frequency analysis of the Beta Cephei star Tau1 Lupi", *Astronomy and Astrophysics Supplement Series*, **69** (3): 445–449, [Bibcode](/source/Bibcode_(identifier)):[1987A&AS...69..445C](https://ui.adsabs.harvard.edu/abs/1987A&AS...69..445C).

1. **[^](#cite_ref-Anderson2012_5-0)** Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", *Astronomy Letters*, **38** (5): 331, [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971), [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A), [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015), [S2CID](/source/S2CID_(identifier)) [119257644](https://api.semanticscholar.org/CorpusID:119257644).

1. ^ [***a***](#cite_ref-PasinettiFracassini2001_6-0) [***b***](#cite_ref-PasinettiFracassini2001_6-1) Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", *Astronomy and Astrophysics*, **367** (2) (3rd ed.): 521–524, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0012289](https://arxiv.org/abs/astro-ph/0012289), [Bibcode](/source/Bibcode_(identifier)):[2001A&A...367..521P](https://ui.adsabs.harvard.edu/abs/2001A&A...367..521P), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20000451](https://doi.org/10.1051%2F0004-6361%3A20000451), [S2CID](/source/S2CID_(identifier)) [425754](https://api.semanticscholar.org/CorpusID:425754).

1. ^ [***a***](#cite_ref-Mcdonald2012_7-0) [***b***](#cite_ref-Mcdonald2012_7-1) McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", *Monthly Notices of the Royal Astronomical Society*, **427** (1): 343–57, [arXiv](/source/ArXiv_(identifier)):[1208.2037](https://arxiv.org/abs/1208.2037), [Bibcode](/source/Bibcode_(identifier)):[2012MNRAS.427..343M](https://ui.adsabs.harvard.edu/abs/2012MNRAS.427..343M), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2012.21873.x](https://doi.org/10.1111%2Fj.1365-2966.2012.21873.x), [S2CID](/source/S2CID_(identifier)) [118665352](https://api.semanticscholar.org/CorpusID:118665352).

1. **[^](#cite_ref-Daszkiewicz2005_8-0)** Daszyńska-Daszkiewicz, J.; Niemczura, E. (April 2005), "Metallicity of mono- and multiperiodic β Cephei stars", *Astronomy and Astrophysics*, **433** (3): 1031–1035, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0410442](https://arxiv.org/abs/astro-ph/0410442), [Bibcode](/source/Bibcode_(identifier)):[2005A&A...433.1031D](https://ui.adsabs.harvard.edu/abs/2005A&A...433.1031D), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20040397](https://doi.org/10.1051%2F0004-6361%3A20040397), [S2CID](/source/S2CID_(identifier)) [119340011](https://api.semanticscholar.org/CorpusID:119340011).

1. ^ [***a***](#cite_ref-Aerts1999_9-0) [***b***](#cite_ref-Aerts1999_9-1) Aerts, C.; De Boeck, I.; Malfait, K.; De Cat, P. (July 1999), "HD 42927 and HD 126341: two pulsating B stars surrounded by circumstellar dust", *Astronomy and Astrophysics*, **347**: 524–531, [Bibcode](/source/Bibcode_(identifier)):[1999A&A...347..524A](https://ui.adsabs.harvard.edu/abs/1999A&A...347..524A).

1. ^ [***a***](#cite_ref-Tetzlaff2011_10-0) [***b***](#cite_ref-Tetzlaff2011_10-1) Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **410** (1): 190–200, [arXiv](/source/ArXiv_(identifier)):[1007.4883](https://arxiv.org/abs/1007.4883), [Bibcode](/source/Bibcode_(identifier)):[2011MNRAS.410..190T](https://ui.adsabs.harvard.edu/abs/2011MNRAS.410..190T), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2010.17434.x](https://doi.org/10.1111%2Fj.1365-2966.2010.17434.x), [S2CID](/source/S2CID_(identifier)) [118629873](https://api.semanticscholar.org/CorpusID:118629873).

1. **[^](#cite_ref-SIMBAD_11-0)** ["tau01 Lup -- Variable Star of beta Cep type"](http://simbad.u-strasbg.fr/simbad/sim-id?Ident=tau01+Lup), *SIMBAD Astronomical Database*, Centre de Données astronomiques de Strasbourg, retrieved 2017-03-10.

1. **[^](#cite_ref-Eggleton2008_12-0)** Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **389** (2): 869–879, [arXiv](/source/ArXiv_(identifier)):[0806.2878](https://arxiv.org/abs/0806.2878), [Bibcode](/source/Bibcode_(identifier)):[2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x), [S2CID](/source/S2CID_(identifier)) [14878976](https://api.semanticscholar.org/CorpusID:14878976).

1. **[^](#cite_ref-deGeus1989_13-0)** de Geus, E. J.; et al. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", *Astronomy and Astrophysics*, **216** (1–2): 44–61, [Bibcode](/source/Bibcode_(identifier)):[1989A&A...216...44D](https://ui.adsabs.harvard.edu/abs/1989A&A...216...44D).

1. **[^](#cite_ref-MAST_14-0)** ["MAST: Barbara A. Mikulski Archive for Space Telescopes"](https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html). Space Telescope Science Institute. Retrieved 8 December 2021.

1. **[^](#cite_ref-Pagel1956_15-0)** Pagel, B. E. J. (1956), "Results of a search for bright β Cephei variables in the southern sky", *Monthly Notices of the Royal Astronomical Society*, **116**: 10, [Bibcode](/source/Bibcode_(identifier)):[1956MNRAS.116...10P](https://ui.adsabs.harvard.edu/abs/1956MNRAS.116...10P), [doi](/source/Doi_(identifier)):[10.1093/mnras/116.1.10](https://doi.org/10.1093%2Fmnras%2F116.1.10).

1. **[^](#cite_ref-stankov2005_16-0)** Stankov, Anamarija; Handler, Gerald (2005), "Catalog of Galactic β Cephei Stars", *The Astrophysical Journal Supplement Series*, **158** (2): 193–216, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0506495](https://arxiv.org/abs/astro-ph/0506495), [Bibcode](/source/Bibcode_(identifier)):[2005ApJS..158..193S](https://ui.adsabs.harvard.edu/abs/2005ApJS..158..193S), [doi](/source/Doi_(identifier)):[10.1086/429408](https://doi.org/10.1086%2F429408), [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049), [S2CID](/source/S2CID_(identifier)) [119526948](https://api.semanticscholar.org/CorpusID:119526948).

v t e Constellation of Lupus List of stars in Lupus Lupus in Chinese astronomy Stars Bayer α (Uridim) β γ δ ε ζ η θ ι κ λ μ ν1 ν2 ξ ο π ρ σ τ1 τ2 υ φ1 φ2 χ ψ1 ψ2 ω Flamsteed 1 (i) 2 (f) Variable RU EX GG GQ HR II IL IM KT (d) V407 V462 HR 5362 5364 5401 5651 (e) 5724 (k) 5825 (g) 5943 5967 HD 134004 135344 136164 141943 142527 143811 Other Gliese 588 HIP 70849 Lupus-TR-3 SSSPM J1549−3544 WASP-132 Exoplanets GQ Lupi b HIP 70849 b Lupus-TR-3b WASP-178b Star clusters NGC 5749 NGC 5822 NGC 5824 NGC 5927 NGC 5986 Nebulae IC 4406 NGC 5882 Galaxies IC 4444 NGC 5530 NGC 5643 Astronomical events SN 1006 Category

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Adapted from the Wikipedia article [Tau1 Lupi](https://en.wikipedia.org/wiki/Tau1_Lupi) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Tau1_Lupi?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.