The Full Wiki

More info on Zeta Draconis

Zeta Draconis: Wikis


Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.


From Wikipedia, the free encyclopedia

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
Spectral type B6III
U-B color index –0.43[2]
B-V color index –0.11[2]
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)
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]


  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. 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. Retrieved 2009-10-10.  
  7. ^ Allen, Richard Hinckley (1899). Star-names and their meanings. New York: G. E. Stechert. p. 210. 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. 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. Retrieved 2009-10-12.  


Got something to say? Make a comment.
Your name
Your email address