HD 166006

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HD 166006
Observation data
Epoch J2000      Equinox J2000
Constellation Telescopium
Right ascension 18h 11m 04.40s[1]
Declination −47° 30′ 47.24″[1]
Apparent magnitude (V) 6.07±0.01[2]
Characteristics
Spectral type K1 III CNII[3]
U−B color index +1.15[4]
B−V color index +1.18[4]
Astrometry
Radial velocity (Rv)−16.51±0.14[1] km/s
Proper motion (μ) RA: −3.69±0.39[5] mas/yr
Dec.: −29.50±0.23[5] mas/yr
Parallax (π)5.6048 ± 0.0652[1] mas
Distance582 ± 7 ly
(178 ± 2 pc)
Absolute magnitude (MV)−0.12[6]
Details
Mass1.24[7] M☉
Radius20.1[8][9] R☉
Luminosity165[6] L☉
Surface gravity (log g)1.89[7] cgs
Temperature4,529±93[8] K
Metallicity [Fe/H]−0.07[7] dex
Rotational velocity (v sin i)<1[10] km/s
Other designations
CD−47 12098, HD 166006, HIP 89096, HR 6778, WDS J18111-4731A[11]
Database references
SIMBADdata

HD 166006 (HR 6778) is a double star in the southern constellation Telescopium. With an apparent magnitude of around 6, it is barely visible to the naked eye under ideal conditions. The star is located 582 light-years (178 parsecs) based on parallax, but is drifting closer with a heliocentric radial velocity of 16.5 km/s.

Properties[]

HD 166006 has a stellar classification of K1 III CNII, which states it is a K-type star that has exhausted hydrogen at its core and left the main sequence. The "CNII" states it has a strong overabundance of cyano radical in its atmosphere. It has 1.24 times the Sun's mass, but has expanded to almost 19 times the Sun's radius. It radiates at 165 solar luminosities from it's enlarged photosphere at an effective temperature of 4,529 K. As of 2015, HD 166006 has a 11th magnitude companion separated 1.8 arcseconds away. However, the companion is unrelated to HD 166006.[12]

References[]

  1. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. ^ Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor : Dept. Of Astronomy, University of Michigan : Distributed by University Microfilms International, 1978-. Bibcode:1978mcts.book.....H.
  4. ^ a b Mermilliod, J.-C. (1 December 1987). "UBV photoelectric photometry catalogue (1986). I - The original data (magnetic tape)". Astronomy and Astrophysics Supplement Series. 71: 413–420. Bibcode:1987A&AS...71..413M. ISSN 0365-0138.
  5. ^ van Leeuwen, F. (1 November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. ISSN 0004-6361. S2CID 18759600.
  6. ^ a b Anderson, E.; Francis, Ch. (1 May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
  7. ^ a b c Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18" (PDF). Astronomy and Astrophysics. 628: A94. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
  8. ^ a b Stevens, Daniel J.; Stassun, Keivan G.; Gaudi, B. Scott (1 December 2017). "Empirical Bolometric Fluxes and Angular Diameters of 1.6 Million Tycho-2 Stars and Radii of 350,000 Stars with Gaia DR1 Parallaxes". The Astronomical Journal. 154 (6): 259. arXiv:1708.05025. Bibcode:2017AJ....154..259S. doi:10.3847/1538-3881/aa957b. ISSN 0004-6256. S2CID 119191064.
  9. ^ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  10. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (1 January 2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. S2CID 54046583.
  11. ^ "HR 6778". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 September 2021.
  12. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (1 December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
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