Beta Lupi

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Star in the constellation of Lupus

title: "Beta Lupi" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["b-type-giants", "upper-centaurus-lupus", "lupus-(constellation)", "bayer-objects", "durchmusterung-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects"] description: "Star in the constellation of Lupus" topic_path: "general/b-type-giants" source: "https://en.wikipedia.org/wiki/Beta_Lupi" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation of Lupus ::

| image = | image=Lupus IAU.svg | float=center | width=240 | position=right | mark=Red circle.svg | mark_width=10 | mark_link=β Lup | x%=55.8 | y%=48.4 | caption=Location of β Lupus (circled) | epoch = J2000 | constell = Lupus | ra = | dec = | appmag_v = 2.68 | class = B2 III | b-v = −0.226 | u-b = −0.902 | variable = β Cep | radial_v = | prop_mo_ra = −35.78 | prop_mo_dec = −39.83 | parallax = 8.52 | p_error = 0.18 | parallax_footnote = | absmag_v = −3.3 | mass = | radius = 6.6 | luminosity = 10,000 | temperature = 24,090 | gravity = 3.76 | metal_fe = | rotational_velocity = 92 | age_myr = | names = |Simbad=bet+Lup

Beta Lupi (Latinized from β Lupi) is a star in the southern constellation of Lupus. It has an apparent visual magnitude of 2.7, making it readily visible to the naked eye. Based upon parallax measurements, this star is located at a distance of about 383 ly from Earth.

Properties

The stellar classification of B2 III indicates this is a giant star. The effective temperature of the star's outer envelope is 24,090 K, giving it the blue-white hue of a B-type star. With an age of around 25 million years, it is near the end of its hydrogen phase, where hydrogen is fused into the element helium, and transferring into a red supergiant star. At about 8.8 solar masses, it may have enough mass to end its life as a Type II supernova, but there is the possibility of Beta Lupi becoming a white dwarf.

This is a multi-period Beta Cephei variable with a dominant oscillation period of 0.232 days. It is a proper motion member of the Upper Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. Beta Lupi has a high proper motion of more than 50 mas per year, suggesting a significant transverse velocity.

It is positioned about 1.3° SSW of the supernova remnant SN 1006.

Name

In Chinese, 騎官 (Qí Guān), meaning Imperial Guards, refers to an asterism consisting of β Lupi, γ Lupi, δ Lupi, κ Centauri, λ Lupi, ε Lupi, μ Lup, π Lupi, ο Lupi and α Lupi. Consequently, the Chinese name for β Lupi itself is 騎官四 (Qí Guān sì, .). From the French rendering of this Chinese name derives the traditional European name Ke Kwan or Kekouan ().

References

References

  1. {{in lang. zh ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN. 978-986-7332-25-7.
  2. {{in lang. zh [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_h_l.htm 香港太空館 - 研究資源 - 亮星中英對照表] {{webarchive. link. (2011-01-29 , Hong Kong Space Museum. Accessed on line November 23, 2010.])
  3. [https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Lupus*.html Richard Hinckley Allen: Star Names — Their Lore and Meaning: Lupus]
  4. van Leeuwen, F.. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
  5. (1999). "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions". Astronomisches Rechen-Institut Heidelberg.
  6. (June 1968). "A photometric investigation of the Scorpio-Centaurus association".
  7. (July 2009). "Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff". Astronomy and Astrophysics.
  8. (March 2006). "Radial velocity measurements of B stars in the Scorpius–Centaurus association". Astronomy and Astrophysics.
  9. (April 2005). "Metallicity of mono- and multiperiodic β Cephei stars". Astronomy and Astrophysics.
  10. (January 2011). "Identification of blue high proper motion objects in the Tycho-2 and 2MASS catalogues using Virtual Observatory tools". Astronomy and Astrophysics.
  11. (December 21, 2004). "The Colour of Stars". [[Commonwealth Scientific and Industrial Research Organisation]].
  12. "bet Lup -- Variable Star". [[Centre de Données astronomiques de Strasbourg]].
  13. Kaler, James B.. (2007). "Beta Lupi". [[University of Illinois]].
  14. (June 1989). "Physical parameters of stars in the Scorpio-Centaurus OB association". Astronomy and Astrophysics.
  15. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". [[Monthly Notices of the Royal Astronomical Society]].
  16. (November 1979). "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars". Monthly Notices of the Royal Astronomical Society.

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b-type-giantsupper-centaurus-lupuslupus-(constellation)bayer-objectsdurchmusterung-objectshenry-draper-catalogue-objectshipparcos-objectsbright-star-catalogue-objects