# Rho Lupi

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Rho_Lupi
> Markdown URL: https://mediated.wiki/source/Rho_Lupi.md
> Source: https://en.wikipedia.org/wiki/Rho_Lupi
> Source revision: 1347971378
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Star in the constellation Lupus

Rho Lupi Location of ρ Lupi (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Lupus Right ascension 14h 37m 53.22583s[1] Declination −49° 25′ 32.9798″[1] Apparent magnitude (V) 4.05[2] Characteristics Spectral type B3/4 V[3] U−B color index −0.56[2] B−V color index −0.15[2] Astrometry Radial velocity (Rv) 8.00±7.40[4] km/s Proper motion (μ) RA: −28.26[1] mas/yr Dec.: −28.82[1] mas/yr Parallax (π) 10.32±0.16 mas[1] Distance 316 ± 5 ly (97 ± 2 pc) Absolute magnitude (MV) −0.88[5] Details Mass 4.66[6] M☉ Radius 3.4[7] R☉ Luminosity 365[8] L☉ Temperature 15,947±542[6] K Rotational velocity (v sin i) 166[6] km/s Age 44[6] Myr Other designations ρ Lup, CD−48°9198, FK5 3158, HD 128345, HIP 71536, HR 5453, SAO 225071[9] Database references SIMBAD data

**Rho Lupi**, [Latinized](/source/Latinisation_of_names) from **ρ Lupi**, is a solitary[10] [star](/source/Star) in the southern [constellation](/source/Constellation) of [Lupus](/source/Lupus_(constellation)). It is visible to the [naked eye](/source/Naked_eye) with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.05.[2] Based upon an annual [parallax shift](/source/Stellar_parallax) of 10.32 [mas](/source/Milliarcsecond) as seen from Earth, it is located about 316 [light years](/source/Light_year) from the [Sun](/source/Sun). It is a member of the Upper Centaurus–Lupus subgroup of the nearby [Scorpius–Centaurus association](/source/Scorpius%E2%80%93Centaurus_association).[11]

A  [light curve](/source/Light_curve) for Rho Lupi, plotted from *[TESS](/source/Transiting_Exoplanet_Survey_Satellite)* data[12]

This is a [B-type main sequence star](/source/B-type_main_sequence_star) with a [stellar classification](/source/Stellar_classification) of B3/4 V.[3] Rho Lupi was discovered to be a [variable star](/source/Variable_star) when the *[Hipparcos](/source/Hipparcos)* data was analyzed.[13] It is a [microvariable](/source/Microvariable) with a period of 10.7 hours and an amplitude of 0.0046 in magnitude.[14] With an age of just 44[6] million years, the star is spinning with a [projected rotational velocity](/source/Projected_rotational_velocity) of 166 km/s.[6] This is giving the star an [oblate](/source/Oblate_spheroid) shape with an [equatorial bulge](/source/Equatorial_bulge) that is an estimated 6% larger than the polar radius.[15] It has an estimated 4.66[6] times the [mass of the Sun](/source/Solar_mass) and about 3.4[7] times the [Sun's radius](/source/Solar_radius). It is radiating 365[8] times the [solar luminosity](/source/Solar_luminosity) from its [outer atmosphere](/source/Stellar_atmosphere) at an [effective temperature](/source/Effective_temperature) of 15,947 K.[6]

## 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-Johnson1966_2-0) [***b***](#cite_ref-Johnson1966_2-1) [***c***](#cite_ref-Johnson1966_2-2) [***d***](#cite_ref-Johnson1966_2-3) Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", *Communications of the Lunar and Planetary Laboratory*, **4** (99): 99, [Bibcode](/source/Bibcode_(identifier)):[1966CoLPL...4...99J](https://ui.adsabs.harvard.edu/abs/1966CoLPL...4...99J).

1. ^ [***a***](#cite_ref-houk1978_3-0) [***b***](#cite_ref-houk1978_3-1) Houk, Nancy (1978), *Michigan catalogue of two-dimensional spectral types for the HD stars*, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, [Bibcode](/source/Bibcode_(identifier)):[1978mcts.book.....H](https://ui.adsabs.harvard.edu/abs/1978mcts.book.....H).

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-David2015_6-0) [***b***](#cite_ref-David2015_6-1) [***c***](#cite_ref-David2015_6-2) [***d***](#cite_ref-David2015_6-3) [***e***](#cite_ref-David2015_6-4) [***f***](#cite_ref-David2015_6-5) [***g***](#cite_ref-David2015_6-6) [***h***](#cite_ref-David2015_6-7) 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](/source/ArXiv_(identifier)):[1501.03154](https://arxiv.org/abs/1501.03154), [Bibcode](/source/Bibcode_(identifier)):[2015ApJ...804..146D](https://ui.adsabs.harvard.edu/abs/2015ApJ...804..146D), [doi](/source/Doi_(identifier)):[10.1088/0004-637X/804/2/146](https://doi.org/10.1088%2F0004-637X%2F804%2F2%2F146), [S2CID](/source/S2CID_(identifier)) [33401607](https://api.semanticscholar.org/CorpusID:33401607).

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) 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)** ["rho Lup"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=rho+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.

1. **[^](#cite_ref-MAST_12-0)** [*MAST: Barbara A. Mikulski Archive for Space Telescopes*](https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html), Space Telescope Science Institute, retrieved 24 September 2022.

1. **[^](#cite_ref-Koen2002_13-0)** Koen, Chris; Eyer, Laurent (March 2002). ["New periodic variables from the Hipparcos epoch photometry"](https://articles.adsabs.harvard.edu/pdf/2002MNRAS.331...45K). *Monthly Notices of the Royal Astronomical Society*. **331** (1): 45–59. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0112194](https://arxiv.org/abs/astro-ph/0112194). [Bibcode](/source/Bibcode_(identifier)):[2002MNRAS.331...45K](https://ui.adsabs.harvard.edu/abs/2002MNRAS.331...45K). [doi](/source/Doi_(identifier)):[10.1046/j.1365-8711.2002.05150.x](https://doi.org/10.1046%2Fj.1365-8711.2002.05150.x). Retrieved 24 December 2024.

1. **[^](#cite_ref-koen2002_14-0)** Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", *Monthly Notices of the Royal Astronomical Society*, **331** (1): 45–59, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0112194](https://arxiv.org/abs/astro-ph/0112194), [Bibcode](/source/Bibcode_(identifier)):[2002MNRAS.331...45K](https://ui.adsabs.harvard.edu/abs/2002MNRAS.331...45K), [doi](/source/Doi_(identifier)):[10.1046/j.1365-8711.2002.05150.x](https://doi.org/10.1046%2Fj.1365-8711.2002.05150.x), [S2CID](/source/S2CID_(identifier)) [10505995](https://api.semanticscholar.org/CorpusID:10505995).

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).

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

---
Adapted from the Wikipedia article [Rho Lupi](https://en.wikipedia.org/wiki/Rho_Lupi) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Rho_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.