HD 165516

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HD 165516
Sagittarius constellation map.svg
Red circle.svg

Location of HD 165516 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 18h 07m 11.35s[1]
Declination −21° 26′ 38.2″[1]
Apparent magnitude (V) +6.33[2]
Spectral type B1/2Ib[3]
U−B color index −0.72[2]
B−V color index +0.12[2]
Radial velocity (Rv) -8.50[4] km/s
Proper motion (μ) RA: −0.23[1] mas/yr
Dec.: −1.15[1] mas/yr
Parallax (π) 1.39 ± 0.49[1] mas
Distance approx. 2,300 ly
(approx. 700 pc)
Absolute magnitude (MV) −5.8[5]
Mass 10.1[6] M
Radius 26[7] R
Temperature 25,000[8] K
Rotational velocity (v sin i) 55[9] km/s
Age 22.5[6] Myr
Other designations
HR 6762, HD 165516, HIP 88760, BD-21°4855
Database references

HD 165516 is a blue supergiant star in the constellation Sagittarius. It is part of the Sagittarius OB1 association and appears against a rich Milky Way starfield near the Triffid Nebula and Lagoon Nebula.

HD 165516 is close to a small reflection and emission nebula, and an associated loose open cluster. The nebula is catalogued as GN 18.05.6, [10] but was first listed as VdB 113.[11] That name has since been used for the cluster itself, which is likely more distant than HD 165516. The whole cluster is less than a quarter of a degree across, with dozens of members from 8th magnitude downwards. V4381 Sagittarii is listed as a probable member, while HD 165516 and the nearby Wolf-Rayet star WR 111 are considered unlikely to be members.[12]


  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D. 
  3. ^ Houk, N.; Smith-Moore, M. (1988). "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0". Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4. Bibcode:1988MSS...C04....0H. 
  4. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  5. ^ Humphreys, R. M. (1978). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". The Astrophysical Journal Supplement Series. 38: 309. Bibcode:1978ApJS...38..309H. doi:10.1086/190559. 
  6. ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. arXiv:1007.4883Freely accessible. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. 
  7. ^ Gulati, R. K.; Malagnini, M. L.; Morossi, C. (1989). "Empirical temperature calibrations for early-type stars". Astronomy and Astrophysics Supplement Series. 80: 73. Bibcode:1989A&AS...80...73G. 
  8. ^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573: 359. Bibcode:2002ApJ...573..359A. doi:10.1086/340590. 
  9. ^ Magakian, T. Yu. (2003). "Merged catalogue of reflection nebulae". Astronomy and Astrophysics. 399: 141. Bibcode:2003A&A...399..141M. doi:10.1051/0004-6361:20021743. 
  10. ^ Van Den Bergh, S. (1966). "A study of reflection nebulae". Astronomical Journal. 71: 990. Bibcode:1966AJ.....71..990V. doi:10.1086/109995. 
  11. ^ Kharchenko, N. V.; Piskunov, A. E.; Schilbach, E.; Röser, S.; Scholz, R.-D. (2013). "Global survey of star clusters in the Milky Way. II. The catalogue of basic parameters". Astronomy & Astrophysics. 558: A53. Bibcode:2013A&A...558A..53K. doi:10.1051/0004-6361/201322302. 

External links[edit]

Image of VdB113 HD 165516 is the lower of the two bright white stars.