# Beta Draconis

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Binary star system in the constellation Draco

β Draconis Location of β Draconis (circled) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Draco Right ascension 17h 30m 25.96170s[1] Declination +52° 18′ 04.9993″[1] Apparent magnitude (V) 2.79[2] Characteristics Spectral type G2Ib-IIa[3] U−B color index +0.954±0.007[4] B−V color index +0.98[5] R−I color index +0.48[5] Astrometry Radial velocity (Rv) −21.00±0.23[4] km/s Proper motion (μ) RA: −15.89[1] mas/yr Dec.: +12.28[1] mas/yr Parallax (π) 8.58±0.10 mas[1] Distance 380 ± 4 ly (117 ± 1 pc) Absolute magnitude (MV) –2.457[6] Details Mass 6.0±0.2[2] M☉ Radius 40[7] R☉ Luminosity 996[7] L☉ Surface gravity (log g) 1.86±0.04[8] cgs Temperature 5,160±150[8] K Metallicity [Fe/H] 0.02±0.10[8] dex Rotational velocity (v sin i) 10.7[8] km/s Age 65[2] Myr Other designations Rastaban, Rastaben, Alwaid, Asuia, NGCA-V25, β Dra, 23 Dra, BD+52°2065, FK5 653, HD 159181, HIP 85670, HR 6536, SAO 30429, ADS 10611, WDS 17304+5218AB[9] Database references SIMBAD data

**Beta Draconis** (**β Draconis**, abbreviated **Beta Dra**, **β Dra**) is a [binary star](/source/Binary_star) system[10] and the third-brightest [star](/source/Star) in the northern [circumpolar constellation](/source/Circumpolar_constellation) of [Draco](/source/Draco_(constellation)). The two components are designated Beta Draconis A (officially named **Rastaban** [/ˈræstəbæn/](https://en.wikipedia.org/wiki/Help:IPA/English), the traditional name of the system)[11] and B respectively. With a combined [apparent visual magnitude](/source/Apparent_visual_magnitude) of 2.79,[2] it is bright enough to be [easily seen](/source/Bortle_Dark-Sky_Scale) with the naked eye. Based upon [parallax](/source/Stellar_parallax) measurements from the [Hipparcos](/source/Hipparcos) astrometry satellite,[12][13] it lies at a distance of about 380 [light-years](/source/Light-year) (120 [parsecs](/source/Parsec)) from the [Sun](/source/Sun).[1] The system is drifting closer with a [radial velocity](/source/Radial_velocity) of −21 km/s.[4]

The binary system consists of a [bright giant](/source/Bright_giant) orbited by a [dwarf](/source/Main-sequence_star) companion once every four [millennia](/source/Millennia) or so.[14] The companion is about 11 magnitudes fainter than the primary star,[15] and the two are separated by 4.2[″](/source/Second_of_arc).[10]

The [spectrum](/source/Stellar_spectrum) of the primary, Beta Draconis A, matches a [stellar classification](/source/Stellar_classification) of G2Ib-IIa,[3] showing mixed features of a [bright giant](/source/Bright_giant) and a [supergiant star](/source/Supergiant_star), and is listed as a standard star for that spectral class.[16] It is about 65 million years old[2] and is currently undergoing its first convective [dredge-up](/source/Dredge-up).[17] Compared to the Sun, Beta Draconis A is an enormous star with six times [the mass](/source/Solar_mass) and roughly 40 times [the radius](/source/Solar_radius). At this size, it is emitting about 950 times the [luminosity of the Sun](/source/Solar_luminosity) from its outer envelope at an [effective temperature](/source/Effective_temperature) of 5,160 [K](/source/Kelvin),[2] giving it the yellow hue of a [G-type star](/source/Stellar_classification#Class_G).[18] The star has a particularly strong [chromospheric emission](/source/Chromospheric_activity) that is generating [X-ray](/source/X-ray_astronomy)[19][20] and [far-UV](/source/Ultraviolet_astronomy) radiation.[21] There is a detectable [magnetic field](/source/Stellar_magnetic_field) with a longitudinal field strength of −1.16±0.25 [G](/source/Gauss_(unit)).[22]

Beta Draconis lies on or near the [cepheid instability strip](/source/Cepheid_instability_strip),[23] yet only appears to be a microvariable with a range of about 1/100 of a magnitude.[24][25] It was confirmed as a variable star with a range of about 1/100 of a magnitude by Gabriel Cristian Neagu using data from the TESS and Hipparcos missions.[24][25] The variability was reported to the AAVSO (American Association of Variable Star Observers), in the Variable Star Index.[26]

## Nomenclature

*β Draconis* ([Latinised](/source/Latinisation_of_names) to *Beta Draconis*) is the system's [Bayer designation](/source/Bayer_designation). The designations of the two components as *Beta Draconis A* and *B* derive from the convention used by the Washington Multiplicity Catalog (WMC) for [multiple star systems](/source/Star_system), and adopted by the [International Astronomical Union](/source/International_Astronomical_Union) (IAU).[27]

It bore the traditional name *Rastaban*, which has also been used for [Gamma Draconis](/source/Gamma_Draconis).[14][28] This name, less commonly written *Rastaben*, derives from the [Arabic](/source/Arabic) phrase *ra's ath-thu'ban* "head of the serpent/dragon". It was also known as *Asuia* and *Alwaid* [/ælˈweɪd/](https://en.wikipedia.org/wiki/Help:IPA/English),[29] the latter from the Arabic *al-ʽawāʼidh* "the old mother camels".[29] In 2016, the IAU organized a [Working Group on Star Names](/source/IAU_Working_Group_on_Star_Names) (WGSN)[30] to catalogue and standardize proper names for stars. The WGSN approved the name *Rastaban* for the component Beta Draconis A on 21 August 2016 and it is now so included in the List of IAU-approved Star Names.[11]

Beta Draconis is part of the [asterism](/source/Asterism_(astronomy)) of the [Mother Camels](/source/Mother_Camels) (Arabic *al'awa'id*), along with Gamma Draconis (Eltanin), [Mu Draconis](/source/Mu_Draconis) (Alrakis), [Nu Draconis](/source/Nu_Draconis) (Kuma) and [Xi Draconis](/source/Xi_Draconis) (Grumium), which was later known as the *Quinque Dromedarii*.[28]

In [Chinese](/source/Chinese_astronomy), 天棓 (*Tiān Bàng*), meaning *[Celestial Flail](/source/Purple_Forbidden_enclosure)*, refers to an asterism consisting of Beta Draconis, Xi Draconis, Nu Draconis, Gamma Draconis and [Iota Herculis](/source/Iota_Herculis).[31] Consequently, the [Chinese name](/source/Chinese_star_names) for Beta Draconis itself is known as 天棓三 (*Tiān Bàng sān*, English: the Third Star of Celestial Flail).[28][32][33]

## References

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1. ^ [***a***](#cite_ref-Kunitzsch_29-0) [***b***](#cite_ref-Kunitzsch_29-1) Kunitzsch, Paul; Smart, Tim (2006). *A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations* (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. [ISBN](/source/ISBN_(identifier)) [978-1-931559-44-7](https://en.wikipedia.org/wiki/Special:BookSources/978-1-931559-44-7).

1. **[^](#cite_ref-WGSN_30-0)** ["IAU Working Group on Star Names (WGSN)"](https://web.archive.org/web/20160610172014/https://www.iau.org/science/scientific_bodies/working_groups/280/). [International Astronomical Union](/source/International_Astronomical_Union). Archived from [the original](https://www.iau.org/science/scientific_bodies/working_groups/280/) on 10 June 2016. Retrieved 22 May 2016.

1. **[^](#cite_ref-zh_31-0)** (in 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](/source/ISBN_(identifier)) [978-986-7332-25-7](https://en.wikipedia.org/wiki/Special:BookSources/978-986-7332-25-7).

1. **[^](#cite_ref-lcsd_32-0)** (in Chinese) [香港太空館 - 研究資源 - 亮星中英對照表](http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_n_r.htm) [Archived](https://web.archive.org/web/20110130063024/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_n_r.htm) 2011-01-30 at the [Wayback Machine](/source/Wayback_Machine), Hong Kong Space Museum. Accessed on line November 23, 2010.

1. **[^](#cite_ref-words_33-0)** Wright, Anne. ["Alwaid"](http://www.constellationsofwords.com/stars/Alwaid.html). *Constellations of Words*. Retrieved September 17, 2008.

## External links

- Dibon-Smith, Richard (1992). *StarList 2000: A Quick Reference Star Catalog for Astronomers*. New York: John Wiley & Sons. [Bibcode](/source/Bibcode_(identifier)):[1992sqrs.book.....D](https://ui.adsabs.harvard.edu/abs/1992sqrs.book.....D). [ISBN](/source/ISBN_(identifier)) [0-471-55895-8](https://en.wikipedia.org/wiki/Special:BookSources/0-471-55895-8).

v t e Constellation of Draco List of stars in Draco Draco in Chinese astronomy Stars Bayer α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ1 (Dziban) ψ2 ω Flamsteed 4 6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 50 59 64 (e) 68 Variable TW YY AG BY CL CM CX DO EK HP V581 HR 3751 4126 4934 5811 6237 6518 6618 (Alruba) 6817 7137 7783 HD 109246 (Funi) 101364 128717 147379 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 KOI-256 LP 71-82 Qatar-1 SDSS J1240+6710 Struve 2398 TOI-1136 WD 1856+534 WISE 1647+5632 WISE 1841+7000 Exoplanets HD 139357 b HD 167042 b ι Dra b (Hypatia) Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i Kepler-296b c d e f TOI-1452 b TrES-2b Star clusters LAMOST 1 Nebulae Cat's Eye Nebula NGC 6742 Galaxies NGC 3147 3197 3735 4121 4125 4221 4236 4319 4331 4332 4363 4441 4513 4545 4589 5678 5777 5866 5866B 5879 5905 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6505 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1927+654 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 343 3C 343.1 3C 351 3C 356 3C 371 3C 380 3C 390.3 3C 401 4C +72.26 4C 73.08 8C 1241+735 Abell 2218 BCG Bean galaxy Beaver galaxy BZQ J1727+5510 Draco Dwarf Draco II GB 1508+5714 Goldfish galaxy H1821+643 HFLS3 IERS B1946+708 IRAS F17179+5444 IRAS 18580+6527 J120011.1+680924.8 KKR 25 Markarian 817 Markarian 876 Original TRG PGC 39058 Porphyrion QSO B1823+568 RGZ J172749.5+534647 S5 1803+784 S5 2007+777 SDSS J1715+6008 Tadpole Galaxy UGC 9391 UGC 9405 UGC 11241 UGC 11411 WISEA J145223.62+611707.5 WN B1851+5707 Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster NGC 5866 Group Astronomical events SN 2003jb SN 2005B SN 2016aps Swift J1644+57 Category

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Adapted from the Wikipedia article [Beta Draconis](https://en.wikipedia.org/wiki/Beta_Draconis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Beta_Draconis?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.