# Upsilon Lupi

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Star in the constellation Lupus

Upsilon Lupi The location of Upsilon Lupi (υ) in the constellation of Lupus (shown as a red target's bullseye). Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Lupus Right ascension 15h 24m 45.00855s[1] Declination −39° 42′ 36.9524″[1] Apparent magnitude (V) 5.37[2] (5.37 + 10.90)[3] Characteristics Spectral type A0p Si[4] B−V color index −0.11[2] Astrometry Radial velocity (Rv) −7.6±2.8[5] km/s Proper motion (μ) RA: −26.10[1] mas/yr Dec.: −54.77[1] mas/yr Parallax (π) 8.02±0.62 mas[1] Distance 410 ± 30 ly (125 ± 10 pc) Absolute magnitude (MV) −0.10[6] Details υ Lup A Luminosity 113[7] L☉ Temperature 10,049[7] K Rotational velocity (v sin i) 0[8] km/s Other designations υ Lup, CD−39°9827, HD 136933, HIP 75439, HR 5719, SAO 206597[9] Database references SIMBAD data

**Upsilon Lupi**, [Latinized](/source/Latinisation_of_names) from υ Lupi, is a [star](/source/Star) system in the southern [constellation](/source/Constellation) of [Lupus](/source/Lupus_(constellation)). It is faintly visible to the naked eye with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 5.37.[2] Based upon an annual [parallax shift](/source/Stellar_parallax) of 8.02[1] [mas](/source/Milliarcsecond) as seen from Earth, it is located around 410 [light years](/source/Light_year) from the [Sun](/source/Sun). The two components of Upsilon Lupi share a [common proper motion](/source/Common_proper_motion) through space and most likely form a wide [binary star](/source/Binary_star) system.[10] As of 1945, the pair had an [angular separation](/source/Angular_separation) of 1.50 [arc seconds](/source/Arc_second) along a [position angle](/source/Position_angle) of 40°.[3]

The brighter member, component A, is a [chemically peculiar](/source/Chemically_peculiar_star) [Ap star](/source/Ap_star) with a [stellar classification](/source/Stellar_classification) of A0p Si,[4] where the 'Si' suffix indicates an abnormal abundance of silicon in the star's [photosphere](/source/Photosphere). A [magnetic field](/source/Stellar_magnetic_field) has been detected with a [quadratic field strength](/source/Quadratic_field_strength) of (764.7±311.3)×10−4 [T](/source/Tesla_(unit)).[11] The star is radiating 113 times the [solar luminosity](/source/Solar_luminosity) from its [outer atmosphere](/source/Stellar_atmosphere) at an [effective temperature](/source/Effective_temperature) of 10,049 K.[7]

The magnitude 10.9 companion star, component B, has a visual magnitude of 10.90.[3] It may be the source of the [X-ray emission](/source/X-ray_astronomy) detected coming from these coordinates.[12]

## 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) [***f***](#cite_ref-vanLeeuwen2007_1-5) 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-Corben1968_2-0) [***b***](#cite_ref-Corben1968_2-1) [***c***](#cite_ref-Corben1968_2-2) Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", *Monthly Notes of the Astronomical Society of Southern Africa*, **27**: 11, [Bibcode](/source/Bibcode_(identifier)):[1968MNSSA..27...11C](https://ui.adsabs.harvard.edu/abs/1968MNSSA..27...11C).

1. ^ [***a***](#cite_ref-Mason2014_3-0) [***b***](#cite_ref-Mason2014_3-1) [***c***](#cite_ref-Mason2014_3-2) Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", *The Astronomical Journal*, **122** (6): 3466–3471, [Bibcode](/source/Bibcode_(identifier)):[2001AJ....122.3466M](https://ui.adsabs.harvard.edu/abs/2001AJ....122.3466M), [doi](/source/Doi_(identifier)):[10.1086/323920](https://doi.org/10.1086%2F323920).

1. ^ [***a***](#cite_ref-houk1979_4-0) [***b***](#cite_ref-houk1979_4-1) Houk, Nancy (1979), *Michigan catalogue of two-dimensional spectral types for the HD stars*, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, [Bibcode](/source/Bibcode_(identifier)):[1982mcts.book.....H](https://ui.adsabs.harvard.edu/abs/1982mcts.book.....H).

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-Mcdonald2012_7-0) [***b***](#cite_ref-Mcdonald2012_7-1) [***c***](#cite_ref-Mcdonald2012_7-2) 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-uesugi_fukuda70_8-0)** 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_9-0)** ["ups Lup"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups+Lup). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-03-10.

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-Bychkova2009_11-0)** Bychkov, V. D.; et al. (April 2009), "Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar A and B stars", *Monthly Notices of the Royal Astronomical Society*, **394** (3): 1338–1350, [Bibcode](/source/Bibcode_(identifier)):[2009MNRAS.394.1338B](https://ui.adsabs.harvard.edu/abs/2009MNRAS.394.1338B), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.14227.x](https://doi.org/10.1111%2Fj.1365-2966.2008.14227.x), [S2CID](/source/S2CID_(identifier)) [120268049](https://api.semanticscholar.org/CorpusID:120268049).

1. **[^](#cite_ref-Schroeder2007_12-0)** Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", *Astronomy and Astrophysics*, **475** (2): 677–684, [Bibcode](/source/Bibcode_(identifier)):[2007A&A...475..677S](https://ui.adsabs.harvard.edu/abs/2007A&A...475..677S), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20077429](https://doi.org/10.1051%2F0004-6361%3A20077429).

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 [Upsilon Lupi](https://en.wikipedia.org/wiki/Upsilon_Lupi) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Upsilon_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.