Zeta Draconis

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 hyenas') with several other stars in the constellation,[7] and, together with Eta Draconis, it also shares the name 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, 紫微左垣 (Zǐ Wēi Zuǒ Yuán), meaning Left Wall of Purple Forbidden Enclosure, refers to an asterism consisting of ζ Draconis, ι Draconis, η Draconis, θ Draconis, υ Draconis, 73 Draconis, γ Cephei and 23 Cassiopeiae.[10] Consequently, ζ Draconis itself is known as 紫微左垣四 (Zǐ Wēi Zuǒ Yuán sì, English: the Fourth Star of Left Wall of Purple Forbidden Enclosure.),[11] representing 上弼 (Shǎngbì), meaning The First Minister.[12] 上弼 (Shǎngbì) is westernized into Shang Pih by R.H. Allen with meaning "the Higher Minister".[13]

Properties

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°.[14] This is located roughly mid-way between Delta Draconis and Zeta Draconis.[15]

References

  1. ^ a b c d e f Perryman, M. A. C. et al. (1997), "The Hipparcos Catalogue", Astronomy & Astrophysics 323: L49–L52, Bibcode 1997A&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). Bibcode 1966CoLPL...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. arXiv:astro-ph/0611618. Bibcode 2007MNRAS.374..664C. 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. arXiv:astro-ph/0205255. Bibcode 2002A&A...393..897R. 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. Bibcode 1936PASP...48..139R. 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. ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 9789867332257.
  11. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 10 日
  12. ^ (Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name, Hong Kong Space Museum. Accessed on line November 23, 2010.
  13. ^ Star Name - R.H. Allen p. 210
  14. ^ Chartrand, Mark R.; Wimmer, Helmut K. (2001). Night Sky: A Guide To Field Identification. Macmillan. p. 12. ISBN 1582381267. 
  15. ^ 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. 
Stars of Draco
Bayer
Flamsteed
Nearby