- Delta Draconis
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δ Draconis 
Location of δ Draconis (left of center).Observation data
Epoch J2000 Equinox J2000Constellation Draco Right ascension 19h 12m 33.3000s[1] Declination +67° 39′ 41.549″[1] Apparent magnitude (V) 3.082 Characteristics Spectral type G9III[2] U−B color index +0.78[3] B−V color index +1.00[3] Astrometry Radial velocity (Rv) 24.8[4] km/s Proper motion (μ) RA: 94.49[1] mas/yr
Dec.: 92.30[1] mas/yrParallax (π) 32.54 ± 0.46[1] mas Distance 100 ± 1 ly
(30.7 ± 0.4 pc)Details Radius 11[5] R☉ Surface gravity (log g) 2.98[6] Luminosity 58[citation needed] L☉ Temperature 4,820[6] K Metallicity ![\begin{smallmatrix}\left[\frac{Fe}{H}\right]\ =\ -0.27\end{smallmatrix}](e/7ae7817ba1db763cb5265ae756659c6c.png)
[6]Rotational velocity (v sin i) 8[7] km/s Other designations Delta Draconis (δ Dra, δ Draconis) is a yellow star in the constellation Draco. It has the traditional names Aldib, Altais[8] (the goat) and Nodus Secundus.[9]
The title Altais was derived from Arabic Al Tāis, "the Goat", the association of this star, along with π Dra, ρ Dra and ε Dra (Tyl).[11].
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Tāis or Tais were the title for three stars :δ Dra as Altais, π Dra as Tais I and ρ Dra as Tais II (exclude ε Dra)[12]
In Chinese, 天廚 (Tiān Chú, Tien Choo), meaning Celestial Kitchen or Heaven's Kitchen, refers to an asterism consisting of δ Draconis, σ Draconis, ε Draconis, ρ Draconis, 64 Draconis and π Draconis.[13] Consequently, δ Draconis itself is known as 天廚一 (Tiān Chú yī, English: the First Star of Celestial Kitchen.)[14]
Structure
Delta Draconis is a giant star with a stellar classification of G9III. At a distance of approximately 100 light years from Earth, it has an apparent magnitude of 3.0. The angular diameter of the star is estimated as 3.37 ± 0.06 mas.[15] At a parallax of 32.54 mas, this corresponds to a physical radius equal to 11 times the solar radius.[5]
References
- ^ a b c d e Perryman, M. A. C. et al; Lindegren; Kovalevsky; Hoeg; Bastian; Bernacca; Crézé; Donati et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode 1997A&A...323L..49P.
- ^ Roman, Nancy G. (July 1952). "The Spectra of the Bright Stars of Types F5-K5". Astrophysical Journal 116: 122. Bibcode 1952ApJ...116..122R. doi:10.1086/145598.
- ^ a b Johnson, H. L.; Mitchell; Iriarte; Wisniewski; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99): 99. Bibcode 1966CoLPL...4...99J.
- ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode 1953QB901.W495......
- ^ a b The Sun has a radius of 0.004652 AU. Thus: See: Lochner, Jim; Gibb, Meredith; Newman, Phil (January 30, 2006). "Using Optical Observations to find the Diameter of HT Cas". NASA. http://imagine.gsfc.nasa.gov/YBA/HTCas-size/optical.html. Retrieved 2010-04-06.
- ^ a b c McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". Astrophysical Journal Supplement Series 74: 1075–1128. Bibcode 1990ApJS...74.1075M. doi:10.1086/191527.
- ^ Bernacca, P. L.; Perinotto, M.; Perinotto (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago 239 (1): 1. Bibcode 1970CoAsi.239....1B.
- ^ a b Bakich, Michael E. (1995). The Cambridge guide to the constellations. Cambridge University Press. p. 184. ISBN 0521449219.
- ^ a b Kaler, James B.. "Nodus Secundus". STARS. University of Illinois. http://stars.astro.illinois.edu/sow/nodus2.html. Retrieved 2010-04-06.
- ^ "del Dra -- Star in double system". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=del+Dra. Retrieved 2010-04-06.
- ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 209. ISBN 0486210790. http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Draco*.html. Retrieved 2010-12-12.
- ^ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institue of Technology; November 15, 1971
- ^ (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.
- ^ Di Benedetto, G. P. (February 2005). "Predicting accurate stellar angular diameters by the near-infrared surface brightness technique". Monthly Notices of the Royal Astronomical Society 357 (1): 174–190. Bibcode 2005MNRAS.357..174D. doi:10.1111/j.1365-2966.2005.08632.x.
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:- Draco constellation
- Bayer objects
- G-type giants
- Stars with proper names
- Giant star stubs
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