- Nu Draconis
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ν1/ν2 Draconis Observation data
Epoch J2000 Equinox J2000Constellation 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/yrParallax (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/yrParallax (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 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
- ^ 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.
- ^ 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. - ^ 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.
- ^ a b Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode 1953QB901.W495......
- ^ 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.
- ^ 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.
- ^ (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.
- ^ (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
- Kaler, James. Kuma
Stars of Draco Bayer α (Thuban) • β (Rastaban) • γ (Eltanin) • δ (Altais) • ε (Tyl) • ζ (Aldhibah) • η (Aldhibain) • θ • ι (Edasich) • κ • λ (Gianfar) • μ (Arrakis) • ν (Kuma) • ξ (Grumium) • ο • π • ρ • σ (Alsafi) • τ • υ • φ • χ • ψ (Dziban) • ω • b • c • d • e • f • g • h • i • AFlamsteed 1 (λ, Gianfar) • 2 • 3 • 4 • 5 (κ) • 6 • 7 • 8 • 9 • 10 (i) • 11 (α, Thuban) • 12 (ι, Edasich) • 13 (θ) • 14 (η, Aldhibain) • 15 (A) • 16 • 17 • 18 (g) • 19 (h) • 20 • 21 (μ, Arrakis) • 22 (ζ, Aldhibah) • 23 (β, Rastaban) • 24 (ν¹, Kuma) • 25 (ν², Kuma) • 26 • 27 (f) • 28 (ω) • 29 • 30 • 31 (ψ, Dziban) • 32 (ξ, Grumium) • 33 (γ, Eltanin) • 34 • 35 • 36 • 37 • 38 • 39 (b) • 40 • 41 • 42 • 43 (φ) • 44 (χ) • 45 (d) • 46 (c) • 47 (ο) • 48 • 49 • 50 • 51 • 52 (υ) • 53 • 54 • 55 • 56 • 57 (δ, Altais) • 58 (π) • 59 • 60 (τ) • 61 (σ, Alsafi) • 62 • 63 (ε, Tyl) • 64 (e) • 65 • 66 • 67 (ρ) • 68 • 69 • 70 • 71 • 72 • 73 • 74 • 75 • 76Nearby Struve 2398 • Gliese 687 • σ (Alsafi) • GJ 1221 • Gliese 625 • GJ 4053 • Gliese 793 • SSSPM J1138-7722 • GJ 1227 • χ (Batentaban Borealis) • WISE 1647+5632List Categories:- Double stars
- Draco constellation
- Star stubs
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