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Zeta Draconis
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 17h 08m 47.1956s[1]
Declination +65° 42′ 52.860″[1]
Apparent magnitude (V) +3.174
Characteristics
Spectral type B6III
U-B color index –0.43[2]
B-V color index –0.11[2]
Astrometry
Radial velocity (Rv) –17[3] km/s
Proper motion (μ) RA: −20.76[1] mas/yr
Dec.: 19.15[1] mas/yr
Parallax (π) 9.60 ± 0.47[1] mas
Distance 340 ± 20 ly
(104 ± 5 pc)
Details
Surface gravity (log g) 4.24[4]
Temperature 13,397[4] K
Metallicity \begin{smallmatrix}\left[\frac{Fe}{H}\right]\ =\ -0.95\end{smallmatrix}
Rotational velocity (v sin i) 55[5] km/s
Other designations
22 Draconis, HR 6396, HD 155763, BD+65 1170, SAO 17365, FK5 639, HIP 83895.[6]

Zeta Draconis (ζ Dra / ζ Draconis) is a star in the constellation Draco. It shares the Arabic name Al dhi'bah (the hyeneas) with several other stars in the constellation,[7] or, together with Eta Draconis, Al dhibain.[8] It is also known as Nodus III (Third Knot, the knot being a loop in the tail of Draco).[9] In Chinese it is known as 紫微左垣四 (the Fourth Star of the Left Wall of the Purple Forbidden Enclosure), or simply 上弼 (the Star of the First Minister).

Zeta Draconis is a giant star with an apparent magnitude of +3.17 and a spectral class of B9. The temperature of the star's photosphere is nearly 13,400 K.[4] The minimum rotation velocity at the equator is 55 km/s.[5] Zeta Draconis is an estimated 340 light years from the Earth.[1]

The north ecliptic pole is located at right ascension 18h and declination +66.5°.[10] This is located roughly mid-way between Delta Draconis and Zeta Draconis.[11]

References

  1. ^ a b c d e f Perryman, M. A. C. et al (1997). "The Hipparcos Catalogue". Astronomy and Astrophysics 323: L49–L52. Bibcode1997A&A...323L..49P.  
  2. ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode1966CoLPL...4...99J.  
  3. ^ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". in Batten, Alan Henry; Heard, John Frederick. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. http://adsabs.harvard.edu/abs/1967IAUS...30...57E. Retrieved 2009-09-10.  
  4. ^ a b c Cenarro, A. J.; et al. (January 2007). "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters". Monthly Notices of the Royal Astronomical Society 374 (2): 664–690. doi:10.1111/j.1365-2966.2006.11196.x.  
  5. ^ a b Royer, F.; et al. (October 2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy and Astrophysics 393: 897–911. doi:10.1051/0004-6361:20020943.  
  6. ^ "Zet Dra". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Zet+Dra. Retrieved 2009-10-10.  
  7. ^ Allen, Richard Hinckley (1899). Star-names and their meanings. New York: G. E. Stechert. p. 210. http://books.google.com/books?id=5xQuAAAAIAAJ. Retrieved 2009-10-10.  
  8. ^ Rumrill, H. B. (June 1936). Star Name Pronunciation. 48. pp. 139-154. doi:10.1086/124681.  
  9. ^ Kaler, Jim. "Al Dhibain ("The Posterior")". Stars. University of Illinois. http://stars.astro.illinois.edu/sow/aldhibpost.html. Retrieved 2009-10-12.  
  10. ^ Chartrand, Mark R.; Wimmer, Helmut K. (2001). Night Sky: A Guide To Field Identification. Macmillan. p. 12. ISBN 1582381267.  
  11. ^ Young, Charles Augustus (1919). Anne Sewell Young. ed. The Elements of Astronomy: a Textbook. Ginn and company. p. 69. http://books.google.com/books?id=CKoRAAAAYAAJ. Retrieved 2009-10-12.  
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