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Sigma Ophiuchi

Star in the constellation Ophiuchus

Summary

Star in the constellation Ophiuchus

| b-v = +1.51 | u-b = +1.57

Sigma Ophiuchi, Latinized from σ Ophiuchi, is a single, orange-hued star in the equatorial constellation Ophiuchus. Its apparent visual magnitude is 4.31, which is bright enough to be faintly visible to the naked eye. The annual parallax shift of 3.62 mas as seen from Earth provides a distance estimate of roughly 900 light years. It is moving closer to the Sun with a radial velocity of −28 km/s.

This is an evolved giant star of type K with a stellar classification of K2 III. It has around 5 to 9 times the mass of the Sun and one hundred times the Sun's radius. The star is radiating 2,600 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,130 K.

References

References

  1. {{cite DR2. 4389237503120493952
  2. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues.
  3. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey.
  4. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S.
  5. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy & Astrophysics.
  6. {{cite Gaia EDR3. 4389237503121158016
  7. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters.
  8. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series.
  9. (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics.
  10. (September 2008). "A catalogue of multiplicity among bright stellar systems". [[Monthly Notices of the Royal Astronomical Society]].
  11. (January 2017). "VLTI/AMBER spectro-interferometry of the late-type supergiants V766 Cen (=HR 5171 A), σ Oph, BM Sco, and HD 206859". Astronomy & Astrophysics.
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This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

k-type-giants suspected-variables bayer-objects ophiuchus durchmusterung-objects flamsteed-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects
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