Nu Draconis

ν1/ν2 Draconis
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
ν1 Draconis
Right ascension 17h 32m 10.5697s[1]
Declination +55° 11′ 03.273″[1]
Apparent magnitude (V) +4.888[2]
ν2 Draconis
Right ascension 17h 32m 16.0258s[1]
Declination +55° 11′ 22.651″[1]
Apparent magnitude (V) +4.865[2]
Characteristics
Spectral type A6V/A4m[2]
U−B color index +0.03/+0.04[3]
B−V color index +0.26/+0.27[3]
Astrometry
Radial velocity (Rv) –15.2[4] km/s
Proper motion (μ) RA: 148.53[1] mas/yr
Dec.: 54.24[1] mas/yr
Parallax (π) 32.96 ± 0.53[1] mas
Distance 99 ± 2 ly
(30.3 ± 0.5 pc)
Radial velocity (Rv) –16.0[4] km/s
Proper motion (μ) RA: 143.71[1] mas/yr
Dec.: 62.46[1] mas/yr
Parallax (π) 32.64 ± 0.53[1] mas
Distance 100 ± 2 ly
(30.6 ± 0.5 pc)
Details
Rotational velocity (v sin i) 86/68[5] km/s
Other designations
ν1/ν2 Draconis, Kuma, 24/25 Dra, HR 6554/6555, BD+55 1944/1945, HD 159541/159560, SAO 30447/30450, FK5 655/657, HIP 85819/85829.

Nu Draconis (also known as ν Dra, ν Draconis, or Kuma) is a double star in the constellation Draco. The respective components are designated ν1 Draconis and ν2 Draconis. The second component is a spectroscopic binary star system.[2]

This star, along with β Dra (Rastaban), γ Dra (Eltanin), μ Dra (Erakis) and ξ Dra (Grumium) were Al ʽAwāïd, "the Mother Camels", which was later known as the Quinque Dromedarii.[6].

In Chinese, 天棓 (Tiān Bàng), meaning Celestial Flail, refers to an asterism consisting of ν Draconis, ξ Draconis, β Draconis, γ Draconis and ι Herculis.[7] Consequently, ν Draconis itself is known as 天棓二 (Tiān Bàng èr, English: the Second Star of Celestial Flail.)[8]

References

  1. ^ a b c d e f g h i j Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode 1997A&A...323L..49P. 
  2. ^ a b c d
    ν1: "24 Dra -- Star in double system". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%40337565&Name=*%20%2024%20Dra. Retrieved 2010-06-04. 
    ν2: "25 Dra -- Spectroscopic binary". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%40337566&Name=*%20%2025%20Dra. Retrieved 2010-06-04. 
  3. ^ 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. 
  4. ^ a b Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode 1953QB901.W495...... 
  5. ^ Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. (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. ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 207. ISBN 0486210790. http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Draco*.html. Retrieved 2010-12-12. 
  7. ^ (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.
  8. ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.

External links

Stars of Draco
Bayer
Flamsteed
Nearby