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30 Ophiuchi

Star in the constellation Ophiuchus

Star in the constellation Ophiuchus

| b-v = +1.48 | u-b = +1.80

30 Ophiuchi is a single star in the equatorial constellation of Ophiuchus, and figures 0.99° east (specifically E½S) of the heart of cluster Messier 10. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.82. The distance to this star is approximately 350 light years based on parallax. Its present motion is, net, one of approaching rather than parting, at −6.7 km/s, its "radial velocity".

This is an aging giant star with a stellar classification of K4III, having exhausted the supply of hydrogen at its core and expanded to 36 times the Sun's radius. The star is radiating 300 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,009 K. It is emitting a far infrared excess due to circumstellar dust, which extends out to a diameter of and has a mass of .

The primary presents with two visual companions: B, at magnitude 9.71 and separation 99.8″, and C, at magnitude 8.75 and separation 220.9″ (3′ 40.9″).

References

| display-authors=1 | last1=Zuckerman | first1=B.

| doi-access=free | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}

| display-authors=1 | last1=Samus | first1=N. N.

References

  1. "30 Oph".
  2. {{Cite Gaia DR2. 4365395040146977408
  3. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
  4. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters.
  5. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H.
  6. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers.
  7. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters.
  8. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics.
  9. (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics.
  10. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal.
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k-type-giants suspected-variables ophiuchus durchmusterung-objects flamsteed-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects
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