# Phi2 Lupi

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Star in the constellation Lupus

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

Phi2 Lupi Location of φ2 Lupi (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Lupus Right ascension 15h 23m 09.35005s[1] Declination −36° 51′ 30.5521″[1] Apparent magnitude (V) 4.535[2] Characteristics Spectral type B4 V[3][4] U−B color index −0.648[2] B−V color index −0.161[2] Astrometry Radial velocity (Rv) +0.80±2.70[5] km/s Proper motion (μ) RA: −18.24[1] mas/yr Dec.: −20.72[1] mas/yr Parallax (π) 6.28±0.20 mas[1] Distance 520 ± 20 ly (159 ± 5 pc) Absolute magnitude (MV) −1.47[6] Details Mass 6.1±0.1[4] M☉ Radius 3.4[7] R☉ Luminosity 800[8] L☉ Temperature 16,780[3] K Rotational velocity (v sin i) 141±6[3] km/s Age 39.9±10.1[4] Myr Other designations φ2 Lup, CD−36°10103, FK5 1403, HD 136664, HIP 75304, HR 5712, SAO 206580[9] Database references SIMBAD data

**Phi2 Lupi**, [Latinized](/source/Latinisation_of_names) from **φ2 Lupi**, is a solitary[10] [star](/source/Star) in the southern [constellation](/source/Constellation) of [Lupus](/source/Lupus_(constellation)). With an [apparent magnitude](/source/Apparent_magnitude) of 4.535,[2] it is bright enough to be seen with the naked eye. Based upon an annual [parallax shift](/source/Stellar_parallax) of 6.28 [mas](/source/Milliarcsecond) as seen from Earth, it is located around 520 [light years](/source/Light_year) from the [Sun](/source/Sun). At that distance, the visual magnitude of the star is diminished by an [extinction factor](/source/Extinction_(astronomy)) of 0.052±0.013 due to [interstellar dust](/source/Interstellar_dust). It is a member of the Upper Centaurus–Lupus subgroup of the [Scorpius–Centaurus association](/source/Scorpius%E2%80%93Centaurus_association).[11]

This is an ordinary [B-type main sequence star](/source/B-type_main_sequence_star) with a [stellar classification](/source/Stellar_classification) of B4 V.[3][4] It has an estimated 6.1[4] times the [mass of the Sun](/source/Solar_mass) and about 3.4[7] times the [Sun's radius](/source/Solar_radius). The star is roughly 40[4] million years and is spinning with a [projected rotational velocity](/source/Projected_rotational_velocity) of 141 km/s.[3] It is radiating about 800[8] times the [solar luminosity](/source/Solar_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 16,780 K.[3]

## 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-Kozok1985_2-0) [***b***](#cite_ref-Kozok1985_2-1) [***c***](#cite_ref-Kozok1985_2-2) [***d***](#cite_ref-Kozok1985_2-3) Kozok, J. R. (September 1985), "Photometric observations of emission B-stars in the southern Milky Way", *Astronomy and Astrophysics Supplement Series*, **61**: 387–405, [Bibcode](/source/Bibcode_(identifier)):[1985A&AS...61..387K](https://ui.adsabs.harvard.edu/abs/1985A&AS...61..387K).

1. ^ [***a***](#cite_ref-Braganca2012_3-0) [***b***](#cite_ref-Braganca2012_3-1) [***c***](#cite_ref-Braganca2012_3-2) [***d***](#cite_ref-Braganca2012_3-3) [***e***](#cite_ref-Braganca2012_3-4) [***f***](#cite_ref-Braganca2012_3-5) Bragança, G. A.; et al. (November 2012), "Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk", *The Astronomical Journal*, **144** (5): 10, [arXiv](/source/ArXiv_(identifier)):[1208.1674](https://arxiv.org/abs/1208.1674), [Bibcode](/source/Bibcode_(identifier)):[2012AJ....144..130B](https://ui.adsabs.harvard.edu/abs/2012AJ....144..130B), [doi](/source/Doi_(identifier)):[10.1088/0004-6256/144/5/130](https://doi.org/10.1088%2F0004-6256%2F144%2F5%2F130), [S2CID](/source/S2CID_(identifier)) [118868235](https://api.semanticscholar.org/CorpusID:118868235), 130.

1. ^ [***a***](#cite_ref-Tetzlaff2011_4-0) [***b***](#cite_ref-Tetzlaff2011_4-1) [***c***](#cite_ref-Tetzlaff2011_4-2) [***d***](#cite_ref-Tetzlaff2011_4-3) [***e***](#cite_ref-Tetzlaff2011_4-4) [***f***](#cite_ref-Tetzlaff2011_4-5) 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-deBruijne2012_5-0)** 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_6-0)** 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_7-0) [***b***](#cite_ref-PasinettiFracassini2001_7-1) Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", *Astronomy & Astrophysics*, **367** (2): 521–24, [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) 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-SIMBAD_9-0)** ["phi02 Lup"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=phi02+Lup). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-03-10.{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: postscript ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_postscript))

1. **[^](#cite_ref-Eggleton2008_10-0)** 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-Chen2012_11-0)** Chen, Christine H.; et al. (September 2012), "A Spitzer MIPS Study of 2.5–2.0 M☉ Stars in Scorpius–Centaurus", *The Astrophysical Journal*, **756** (2): 24, [arXiv](/source/ArXiv_(identifier)):[1207.3415](https://arxiv.org/abs/1207.3415), [Bibcode](/source/Bibcode_(identifier)):[2012ApJ...756..133C](https://ui.adsabs.harvard.edu/abs/2012ApJ...756..133C), [doi](/source/Doi_(identifier)):[10.1088/0004-637X/756/2/133](https://doi.org/10.1088%2F0004-637X%2F756%2F2%2F133), [S2CID](/source/S2CID_(identifier)) [119278056](https://api.semanticscholar.org/CorpusID:119278056), 133.

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 [Phi2 Lupi](https://en.wikipedia.org/wiki/Phi2_Lupi) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Phi2_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.