# Theta Lupi

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Star in the constellation Lupus

Theta Lupi Location of θ Lupi (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Lupus Right ascension 16h 06m 35.54525s[1] Declination −36° 48′ 08.2653″[1] Apparent magnitude (V) 4.22[2] Characteristics Spectral type B2.5 Vn[3] U−B color index −0.734[2] B−V color index −0.184[2] Astrometry Radial velocity (Rv) +6.0±3.4[4] km/s Proper motion (μ) RA: −15.33[1] mas/yr Dec.: −33.83[1] mas/yr Parallax (π) 7.87±0.47 mas[1] Distance 410 ± 20 ly (127 ± 8 pc) Absolute magnitude (MV) −1.29[5] Details Mass 6.5±0.1[6] M☉ Radius 4.5[7] R☉ Luminosity 792[8] L☉ Surface gravity (log g) 4.5[9] cgs Temperature 15,395[8] K Rotational velocity (v sin i) 331[10] km/s Age 24.6±5.2[6] Myr Other designations θ Lup, CD−36°10642, FK5 599, HD 144294, HIP 78918, HR 5987, SAO 207332[11] Database references SIMBAD data

**Theta Lupi**, [Latinized](/source/Latinisation_of_names) from **θ 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 4.22.[2] (The [planetary nebula](/source/Planetary_nebula) [NGC 6072](/source/NGC_6072) lies 1.4° to the east-northeast.[13]) Based upon an annual [parallax shift](/source/Stellar_parallax) of 7.87 [mas](/source/Milliarcsecond) as seen from Earth, it is located roughly 410 [light years](/source/Light_year) away from the [Sun](/source/Sun). Relative to its neighbors, this star has a [peculiar velocity](/source/Peculiar_velocity) of 16.7±3.7 km/s.[14] It is a member of the nearby [Sco OB2](/source/Sco_OB2) association.[12]

This is a [B-type main sequence star](/source/B-type_main_sequence_star) with a [stellar classification](/source/Stellar_classification) of B2.5 Vn,[3] where the 'n' suffix indicates nebulous [lines](/source/Absorption_line) due to spin. It is rotating rapidly with a [projected rotational velocity](/source/Projected_rotational_velocity) of 331 km/s.[10] This is giving the star an [oblate](/source/Oblate_spheroid) shape with an [equatorial bulge](/source/Equatorial_bulge) that is an estimated 15% larger than the polar radius.[15] The star has an estimated 6.5[6] times the [mass of the Sun](/source/Solar_mass) and around 4.5[7] times the [Sun's radius](/source/Solar_radius). With an age of just 24.6[6] million years, it is radiating 792 times the [solar luminosity](/source/Solar_luminosity) from its [outer atmosphere](/source/Stellar_atmosphere) at an [effective temperature](/source/Effective_temperature) of 15,395 K.[8]

## 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-GutierrezMoreno1968_2-0) [***b***](#cite_ref-GutierrezMoreno1968_2-1) [***c***](#cite_ref-GutierrezMoreno1968_2-2) [***d***](#cite_ref-GutierrezMoreno1968_2-3) Gutierrez-Moreno, Adelina; Moreno, Hugo (1968), "A Photometric Investigation of the Scorpio-Centaurus Association", *Astrophysical Journal Supplement*, **15**: 459, [Bibcode](/source/Bibcode_(identifier)):[1968ApJS...15..459G](https://ui.adsabs.harvard.edu/abs/1968ApJS...15..459G), [doi](/source/Doi_(identifier)):[10.1086/190168](https://doi.org/10.1086%2F190168).

1. ^ [***a***](#cite_ref-Hiltner1969_3-0) [***b***](#cite_ref-Hiltner1969_3-1) Hiltner, W. A.; et al. (July 1969), "MK Spectral Types for Bright Southern OB Stars", *Astrophysical Journal*, **157**: 313–326, [Bibcode](/source/Bibcode_(identifier)):[1969ApJ...157..313H](https://ui.adsabs.harvard.edu/abs/1969ApJ...157..313H), [doi](/source/Doi_(identifier)):[10.1086/150069](https://doi.org/10.1086%2F150069).

1. **[^](#cite_ref-deBruijne2012_4-0)** de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", *Astronomy & Astrophysics*, **546**: 14, [arXiv](/source/ArXiv_(identifier)):[1208.3048](https://arxiv.org/abs/1208.3048), [Bibcode](/source/Bibcode_(identifier)):[2012A&A...546A..61D](https://ui.adsabs.harvard.edu/abs/2012A&A...546A..61D), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201219219](https://doi.org/10.1051%2F0004-6361%2F201219219), [S2CID](/source/S2CID_(identifier)) [59451347](https://api.semanticscholar.org/CorpusID:59451347), A61.

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-Tetzlaff2011_6-0) [***b***](#cite_ref-Tetzlaff2011_6-1) [***c***](#cite_ref-Tetzlaff2011_6-2) [***d***](#cite_ref-Tetzlaff2011_6-3) 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*, **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. ^ [***a***](#cite_ref-PasinettiFracassini2001_7-0) [***b***](#cite_ref-PasinettiFracassini2001_7-1) Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", *Astronomy and Astrophysics*, **367** (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_8-0) [***b***](#cite_ref-Mcdonald2012_8-1) [***c***](#cite_ref-Mcdonald2012_8-2) 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-Kraus2016_9-0)** Gullikson, Kevin; et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", *The Astronomical Journal*, **152** (2): 13, [arXiv](/source/ArXiv_(identifier)):[1604.06456](https://arxiv.org/abs/1604.06456), [Bibcode](/source/Bibcode_(identifier)):[2016AJ....152...40G](https://ui.adsabs.harvard.edu/abs/2016AJ....152...40G), [doi](/source/Doi_(identifier)):[10.3847/0004-6256/152/2/40](https://doi.org/10.3847%2F0004-6256%2F152%2F2%2F40), [S2CID](/source/S2CID_(identifier)) [119179065](https://api.semanticscholar.org/CorpusID:119179065), 40.

1. ^ [***a***](#cite_ref-UesugiFukuda70_10-0) [***b***](#cite_ref-UesugiFukuda70_10-1) Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", *Contributions from the Institute of Astrophysics and Kwasan Observatory*, University of Kyoto, [Bibcode](/source/Bibcode_(identifier)):[1970crvs.book.....U](https://ui.adsabs.harvard.edu/abs/1970crvs.book.....U).

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

1. ^ [***a***](#cite_ref-Rizzuto2013_12-0) [***b***](#cite_ref-Rizzuto2013_12-1) Rizzuto, A. C.; et al. (December 2013), "Long-baseline interferometric multiplicity survey of the Sco-Cen OB association", *Monthly Notices of the Royal Astronomical Society*, **436** (2): 1694–1707, [arXiv](/source/ArXiv_(identifier)):[1309.3811](https://arxiv.org/abs/1309.3811), [Bibcode](/source/Bibcode_(identifier)):[2013MNRAS.436.1694R](https://ui.adsabs.harvard.edu/abs/2013MNRAS.436.1694R), [doi](/source/Doi_(identifier)):[10.1093/mnras/stt1690](https://doi.org/10.1093%2Fmnras%2Fstt1690).

1. **[^](#cite_ref-Bakich2010_13-0)** Bakich, Michael E. (2010), [*1,001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers*](https://books.google.com/books?id=qEhpS7d5ZdAC&pg=PA191), The Patrick Moore Practical Astronomy Series, Springer Science & Business Media, p. 191, [ISBN](/source/ISBN_(identifier)) [978-1441917775](https://en.wikipedia.org/wiki/Special:BookSources/978-1441917775).

1. **[^](#cite_ref-Bobylev2013_14-0)** 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. **[^](#cite_ref-belle2012_15-0)** Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", *The Astronomy and Astrophysics Review*, **20** (1): 51, [arXiv](/source/ArXiv_(identifier)):[1204.2572](https://arxiv.org/abs/1204.2572), [Bibcode](/source/Bibcode_(identifier)):[2012A&ARv..20...51V](https://ui.adsabs.harvard.edu/abs/2012A&ARv..20...51V), [doi](/source/Doi_(identifier)):[10.1007/s00159-012-0051-2](https://doi.org/10.1007%2Fs00159-012-0051-2), [S2CID](/source/S2CID_(identifier)) [119273474](https://api.semanticscholar.org/CorpusID:119273474).

## External links

- Kaler, James B. (July 12, 2013), ["Theta Lupi"](http://stars.astro.illinois.edu/sow/thetalup.html), *Stars*, University of Illinois, retrieved 2017-03-05.

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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