# 8 Draconis

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White-hued chemically unusual star in the constellation Draco

8 Draconis Location of 8 Draconis (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Draco Right ascension 12h 55m 28.54856s[1] Declination +65° 26′ 18.5071″[1] Apparent magnitude (V) 5.225[2] Characteristics Evolutionary stage main sequence[1] Spectral type F1VmA7(n)[3] B−V color index 0.303±0.005[4] Variable type Gamma Doradus[5] Astrometry Radial velocity (Rv) +9.0[6] km/s Proper motion (μ) RA: −3.658[1] mas/yr Dec.: −30.126[1] mas/yr Parallax (π) 33.9667±0.0792 mas[1] Distance 96.0 ± 0.2 ly (29.44 ± 0.07 pc) Absolute magnitude (MV) 2.90[4] Details Mass 1.56[7] M☉ Radius 1.50[7] R☉ Luminosity 5.75[4] L☉ Surface gravity (log g) 4.01[3] cgs Temperature 7,129[3] K Metallicity [Fe/H] −0.14[3] dex Rotational velocity (v sin i) 119.6[8] km/s Age 250±200[7] Myr Other designations Taiyi, 8 Dra, IR Draconis, BD+66°778, FK5 486, HD 112429, HIP 63076, HR 4916, SAO 15941[9] Database references SIMBAD data

**8 Draconis**, formally named **Taiyi** [/ˌtaɪˈjiː/](https://en.wikipedia.org/wiki/Help:IPA/English),[10] is a single[11] [star](/source/Star) in the northern [circumpolar constellation](/source/Circumpolar_constellation) of [Draco](/source/Draco_(constellation)). Based upon an annual [parallax](/source/Parallax) shift of 33.97 [mas](/source/Milliarcsecond) as seen from the [Earth](/source/Earth),[12] the star is located 96 [light-years](/source/Light-year) from the [Sun](/source/Sun). It is moving further away with a heliocentric [radial velocity](/source/Radial_velocity) of +9 km/s,[6] having come within 40.6 ly some 2.6 million years ago.[4]

A [light curve](/source/Light_curve) for IR Draconis, adapted from Aerts *et al.* (1998)[13]

This is an [F-type main-sequence star](/source/F-type_main-sequence_star) with a [stellar classification](/source/Stellar_classification) of F1VmA7(n).[3] It is a [Gamma Doradus variable](/source/Gamma_Doradus_variable) star with a brightness variation of about one tenth of a [magnitude](/source/Visual_magnitude).[5] 8 Dra has a relatively high rate of rotation, showing a [projected rotational velocity](/source/Projected_rotational_velocity) of 120 km/s.[8] The star has 1.56 times the [mass of the Sun](/source/Mass_of_the_Sun) and 1.50 times the [Sun's radius](/source/Sun's_radius).[7] It is radiating 5.75[4] times the [Sun's luminosity](/source/Sun's_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 7,129 K.[3] An [infrared excess](/source/Infrared_excess) has been detected at [wavelengths](/source/Wavelength) of 24 and 70μm, which suggests the presence of a [circumstellar disk](/source/Circumstellar_disk) orbiting the star.[7]

## Nomenclature

8 Draconis is the star's [Flamsteed designation](/source/Flamsteed_designation). It also received the [variable star designation](/source/Variable_star_designation) IR Draconis in 2000, after its variability had been discovered using [Hipparcos](/source/Hipparcos) photometry.[5]

The star bore the [traditional Chinese name](/source/Chinese_star_names) of *Taiyi*,[14][15] from 太乙 (*Tài Yǐ*) or 太一 (*Tài Yī*, the Great One), both of which refer to [Tao](/source/Tao). Alternatively, Taiyi may refer to [HD 119476](https://en.wikipedia.org/w/index.php?title=HD_119476&action=edit&redlink=1)[17] or [4 Draconis](/source/4_Draconis),[18] with [7](/source/7_Draconis) and 8 Draconis forming *Neichu*, representing a private kitchen.[19] In 2016, the [International Astronomical Union](/source/International_Astronomical_Union) organized a [Working Group on Star Names](/source/IAU_Working_Group_on_Star_Names) (WGSN)[20] to catalogue and standardize proper names for stars. The WGSN approved the name *Taiyi* for this star on 30 June 2017 and it is now so entered in the IAU Catalog of Star Names.[21]

## References

1. ^ [***a***](#cite_ref-GaiaDR3_1-0) [***b***](#cite_ref-GaiaDR3_1-1) [***c***](#cite_ref-GaiaDR3_1-2) [***d***](#cite_ref-GaiaDR3_1-3) [***e***](#cite_ref-GaiaDR3_1-4) [***f***](#cite_ref-GaiaDR3_1-5) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D1677302170674242560%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. **[^](#cite_ref-tycho2_2-0)** Høg, E; Fabricius, C; Makarov, V. V; Urban, S; Corbin, T; Wycoff, G; Bastian, U; Schwekendiek, P; Wicenec, A (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". *Astronomy and Astrophysics*. **355**: L27. [Bibcode](/source/Bibcode_(identifier)):[2000A&A...355L..27H](https://ui.adsabs.harvard.edu/abs/2000A&A...355L..27H).

1. ^ [***a***](#cite_ref-gray_3-0) [***b***](#cite_ref-gray_3-1) [***c***](#cite_ref-gray_3-2) [***d***](#cite_ref-gray_3-3) [***e***](#cite_ref-gray_3-4) [***f***](#cite_ref-gray_3-5) Gray, R. O; Corbally, C. J; Garrison, R. F; McFadden, M. T; Robinson, P. E (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I". *The Astronomical Journal*. **126** (4): 2048. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0308182](https://arxiv.org/abs/astro-ph/0308182). [Bibcode](/source/Bibcode_(identifier)):[2003AJ....126.2048G](https://ui.adsabs.harvard.edu/abs/2003AJ....126.2048G). [doi](/source/Doi_(identifier)):[10.1086/378365](https://doi.org/10.1086%2F378365). [S2CID](/source/S2CID_(identifier)) [119417105](https://api.semanticscholar.org/CorpusID:119417105).

1. ^ [***a***](#cite_ref-Anderson2012_4-0) [***b***](#cite_ref-Anderson2012_4-1) [***c***](#cite_ref-Anderson2012_4-2) [***d***](#cite_ref-Anderson2012_4-3) [***e***](#cite_ref-Anderson2012_4-4) Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", *Astronomy Letters*, **38** (5): 331, [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971), [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A), [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015), [S2CID](/source/S2CID_(identifier)) [119257644](https://api.semanticscholar.org/CorpusID:119257644).

1. ^ [***a***](#cite_ref-gcvs_5-0) [***b***](#cite_ref-gcvs_5-1) [***c***](#cite_ref-gcvs_5-2) Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". *VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S*. **1**. [Bibcode](/source/Bibcode_(identifier)):[2009yCat....102025S](https://ui.adsabs.harvard.edu/abs/2009yCat....102025S).

1. ^ [***a***](#cite_ref-rv_6-0) [***b***](#cite_ref-rv_6-1) Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". *Washington*. [Bibcode](/source/Bibcode_(identifier)):[1953GCRV..C......0W](https://ui.adsabs.harvard.edu/abs/1953GCRV..C......0W).

1. ^ [***a***](#cite_ref-Plavchan2009_7-0) [***b***](#cite_ref-Plavchan2009_7-1) [***c***](#cite_ref-Plavchan2009_7-2) [***d***](#cite_ref-Plavchan2009_7-3) [***e***](#cite_ref-Plavchan2009_7-4) Plavchan, Peter; et al. (2009), "New Debris Disks Around Young, Low-Mass Stars Discovered with the Spitzer Space Telescope", *The Astrophysical Journal*, **698** (2): 1068–94, [arXiv](/source/ArXiv_(identifier)):[0904.0819](https://arxiv.org/abs/0904.0819), [Bibcode](/source/Bibcode_(identifier)):[2009ApJ...698.1068P](https://ui.adsabs.harvard.edu/abs/2009ApJ...698.1068P), [doi](/source/Doi_(identifier)):[10.1088/0004-637X/698/2/1068](https://doi.org/10.1088%2F0004-637X%2F698%2F2%2F1068), [S2CID](/source/S2CID_(identifier)) [51417657](https://api.semanticscholar.org/CorpusID:51417657).

1. ^ [***a***](#cite_ref-Schröder2009_8-0) [***b***](#cite_ref-Schröder2009_8-1) Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), ["Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo"](http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2) (PDF), *Astronomy and Astrophysics*, **493** (3): 1099–1107, [Bibcode](/source/Bibcode_(identifier)):[2009A&A...493.1099S](https://ui.adsabs.harvard.edu/abs/2009A&A...493.1099S), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:200810377](https://doi.org/10.1051%2F0004-6361%3A200810377)[*[permanent dead link](https://en.wikipedia.org/wiki/Wikipedia:Link_rot)*]

1. **[^](#cite_ref-SIMBAD_9-0)** ["8 Dra"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=8+Dra). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2019-01-23.

1. **[^](#cite_ref-skylive_10-0)** ["The Sky Live"](https://theskylive.com/sky/stars/taiyi-8-draconis-star). *theskylive.com*. Retrieved 2025-04-09.

1. **[^](#cite_ref-Eggleton2008_11-0)** Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", *Monthly Notices of the Royal Astronomical Society*, **389** (2): 869, [arXiv](/source/ArXiv_(identifier)):[0806.2878](https://arxiv.org/abs/0806.2878), [Bibcode](/source/Bibcode_(identifier)):[2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x), [S2CID](/source/S2CID_(identifier)) [14878976](https://api.semanticscholar.org/CorpusID:14878976).

1. **[^](#cite_ref-hipparcos_12-0)** Van Leeuwen, F (2007). "Validation of the new Hipparcos reduction". *Astronomy and Astrophysics*. **474** (2): 653–664. [arXiv](/source/ArXiv_(identifier)):[0708.1752](https://arxiv.org/abs/0708.1752). [Bibcode](/source/Bibcode_(identifier)):[2007A&A...474..653V](https://ui.adsabs.harvard.edu/abs/2007A&A...474..653V). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078357](https://doi.org/10.1051%2F0004-6361%3A20078357). [S2CID](/source/S2CID_(identifier)) [18759600](https://api.semanticscholar.org/CorpusID:18759600).

1. **[^](#cite_ref-Aerts_13-0)** Aerts, C.; Eyer, L.; Kestens, E. (September 1998). "The discovery of new γ Doradus stars from the HIPPARCOS mission". *Astronomy and Astrophysics*. **337**: 790–796. [Bibcode](/source/Bibcode_(identifier)):[1998A&A...337..790A](https://ui.adsabs.harvard.edu/abs/1998A&A...337..790A).

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1. **[^](#cite_ref-TriRpt18_15-0)** ["WG Triennial Report (2015-2018) - Star Names"](https://exopla.net/wp-content/uploads/2025/04/2018_WGSN-triennial-report-2015-2018.pdf) (PDF). p. 7. Retrieved 2018-07-14.

1. **[^](#cite_ref-Yi1981_16-0)** Yi, Shitong (April 1981). 中西对照恒星图表 [*Atlas Comparing Chinese and Western Star Maps and Catalogues*] (in Chinese). 科学出版社.

1. **[^](#cite_ref-17)** [Stellarium](/source/Stellarium_(software)), citing Yi Shitong, 1981[16]

1. **[^](#cite_ref-Yang2024_18-0)** Yang, Bo-Shun; Hoffmann, Susanne M. (December 2024). "Identification of Z Cam's Historical Counterpart: The Quest for an Ancient Nova". *[Research in Astronomy and Astrophysics](/source/Research_in_Astronomy_and_Astrophysics)*. **24** (12): 125004. [arXiv](/source/ArXiv_(identifier)):[2410.19010](https://arxiv.org/abs/2410.19010). [Bibcode](/source/Bibcode_(identifier)):[2024RAA....24l5004Y](https://ui.adsabs.harvard.edu/abs/2024RAA....24l5004Y). [doi](/source/Doi_(identifier)):[10.1088/1674-4527/ad89aa](https://doi.org/10.1088%2F1674-4527%2Fad89aa).

1. **[^](#cite_ref-Ridpath_19-0)** [Ridpath, Ian](/source/Ian_Ridpath). ["Star Tales - Draco"](http://ianridpath.com/startales/draco.html). Retrieved 10 May 2025.

1. **[^](#cite_ref-WGSN_20-0)** ["International Astronomical Union | IAU"](https://iau.org/WG280). *www.iau.org*. Retrieved 2025-04-09.

1. **[^](#cite_ref-IAU-CSN-new_21-0)** ["IAU Catalog of Star Names"](https://exopla.net/star-names/modern-iau-star-names/). Retrieved 10 May 2025.

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 [8 Draconis](https://en.wikipedia.org/wiki/8_Draconis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/8_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.