# 7 Draconis

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Star in the constellation Draco

7 Draconis Location of 7 Draconis (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Draco Right ascension 12h 47m 34.34473s[1] Declination +66° 47′ 25.0977″[1] Apparent magnitude (V) 5.43[2] Characteristics Spectral type K5 III[2] B−V color index 1.567±0.006[2] Astrometry Radial velocity (Rv) +11.33[3] km/s Proper motion (μ) RA: 6.674[1] mas/yr Dec.: −6.498[1] mas/yr Parallax (π) 4.1601±0.1056 mas[1] Distance 780 ± 20 ly (240 ± 6 pc) Absolute magnitude (MV) −1.35[2] Details Mass 1.13[4] M☉ Radius 63[5] R☉ Luminosity 1,024[2] L☉ Surface gravity (log g) 1.04[6] cgs Temperature 3,903[6] K Age 2.3[6] Gyr Other designations Tianyi, 7 Dra, BD+67°764, FK5 3020, HD 111335, HIP 62423, HR 4863, SAO 15902[3] Database references SIMBAD data

**7 Draconis**, also named **Tianyi** [/tiænˈjiː/](https://en.wikipedia.org/wiki/Help:IPA/English),[7] is a single[8] [star](/source/Star) in the northern [circumpolar constellation](/source/Circumpolar_constellation) of [Draco](/source/Draco_(constellation)). It is visible to the naked eye as a faint orange-hued star with a [stellar classification](/source/Stellar_classification) of 5.43.[2] Based upon an annual [parallax](/source/Parallax) shift of 4.16 [mas](/source/Milliarcsecond) as seen from the [Earth](/source/Earth),[1] the star is located approximately 780 [light-years](/source/Light-year) from the [Sun](/source/Sun).

This is an [evolved](/source/Stellar_evolution) [giant star](/source/Giant_star) with a [stellar classification](/source/Stellar_classification) of K5 III.[2] The measured [angular diameter](/source/Angular_diameter) of this star, after correction for [limb darkening](/source/Limb_darkening), is 2.61±0.03 [mas](/source/Milliarcsecond).[9] At its estimated distance, this yields a physical size of about 63 times the [radius of the Sun](/source/Solar_radius).[5] It is radiating about 1,024 times the [Sun's luminosity](/source/Sun's_luminosity)[2] from its enlarged [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 3,903 [K](/source/Kelvin).[6]

## Nomenclature

7 Draconis is the star's [Flamsteed designation](/source/Flamsteed_designation).

The star bore the [traditional Chinese name](/source/Chinese_star_names) of *Tianyi*,[10][11] from 天乙 (*Tiān Yǐ*) or 天一 (*Tiān Yī*, the Celestial Great One), a deity in Taoism. Alternatively, Tianyi may refer to [10 Draconis](/source/10_Draconis)[13] or [κ Draconis](/source/%CE%9A_Draconis),[14] with 7 and [8 Draconis](/source/8_Draconis) forming *Neichu*, representing a private kitchen.[15] 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)[16] to catalogue and standardize proper names for stars. The WGSN approved the name *Tianyi* for this star on 30 June 2017 and it is now so entered in the IAU Catalog of Star Names.[17]

## References

1. ^ [***a***](#cite_ref-GaiaDR2_1-0) [***b***](#cite_ref-GaiaDR2_1-1) [***c***](#cite_ref-GaiaDR2_1-2) [***d***](#cite_ref-GaiaDR2_1-3) [***e***](#cite_ref-GaiaDR2_1-4) [***f***](#cite_ref-GaiaDR2_1-5) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051). [Gaia DR2 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%201683112784684915456) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Anderson2012_2-0) [***b***](#cite_ref-Anderson2012_2-1) [***c***](#cite_ref-Anderson2012_2-2) [***d***](#cite_ref-Anderson2012_2-3) [***e***](#cite_ref-Anderson2012_2-4) [***f***](#cite_ref-Anderson2012_2-5) [***g***](#cite_ref-Anderson2012_2-6) [***h***](#cite_ref-Anderson2012_2-7) 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-SIMBAD_3-0) [***b***](#cite_ref-SIMBAD_3-1) ["6 Dra"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=6+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-khalatyan2024_4-0)** Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million *Gaia* DR3 XP stars with SHBoost". *Astronomy & Astrophysics*. **691**: A98. [arXiv](/source/ArXiv_(identifier)):[2407.06963](https://arxiv.org/abs/2407.06963). [Bibcode](/source/Bibcode_(identifier)):[2024A&A...691A..98K](https://ui.adsabs.harvard.edu/abs/2024A&A...691A..98K). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202451427](https://doi.org/10.1051%2F0004-6361%2F202451427).

1. ^ [***a***](#cite_ref-tic_5-0) [***b***](#cite_ref-tic_5-1) Stassun, Keivan G.; et al. (2019-10-01). ["The Revised TESS Input Catalog and Candidate Target List"](https://doi.org/10.3847%2F1538-3881%2Fab3467). *The Astronomical Journal*. **158** (4): 138. [arXiv](/source/ArXiv_(identifier)):[1905.10694](https://arxiv.org/abs/1905.10694). [Bibcode](/source/Bibcode_(identifier)):[2019AJ....158..138S](https://ui.adsabs.harvard.edu/abs/2019AJ....158..138S). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ab3467](https://doi.org/10.3847%2F1538-3881%2Fab3467). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. ^ [***a***](#cite_ref-kordopatis2023_6-0) [***b***](#cite_ref-kordopatis2023_6-1) [***c***](#cite_ref-kordopatis2023_6-2) [***d***](#cite_ref-kordopatis2023_6-3) Kordopatis, G.; et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". *Astronomy and Astrophysics*. **669**: A104. [arXiv](/source/ArXiv_(identifier)):[2206.07937](https://arxiv.org/abs/2206.07937). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...669A.104K](https://ui.adsabs.harvard.edu/abs/2023A&A...669A.104K). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202244283](https://doi.org/10.1051%2F0004-6361%2F202244283).

1. **[^](#cite_ref-IAU-LSN_7-0)** ["Naming Stars"](https://web.archive.org/web/20250224122744/https://www.iau.org/public/themes/naming_stars/). IAU.org. Archived from [the original](https://www.iau.org/public/themes/naming_stars/) on 24 February 2025. Retrieved 16 December 2017.

1. **[^](#cite_ref-Eggleton2008_8-0)** Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **389** (2): 869–879, [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-Richichi2005_9-0)** Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", *Astronomy and Astrophysics*, **431** (2): 773–777, [Bibcode](/source/Bibcode_(identifier)):[2005A&A...431..773R](https://ui.adsabs.harvard.edu/abs/2005A&A...431..773R), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20042039](https://doi.org/10.1051%2F0004-6361%3A20042039).

1. **[^](#cite_ref-Bonnet-Bidaud2009_10-0)** Bonnet-Bidaud, Jean-Marc; Praderie, Françoise; Whitfield, Susan (March 2009). "The Dunhuang Chinese sky: A comprehensive study of the oldest known star atlas". *[Journal of Astronomical History and Heritage](/source/Journal_of_Astronomical_History_and_Heritage)*. **12** (1): 39–59. [arXiv](/source/ArXiv_(identifier)):[0906.3034](https://arxiv.org/abs/0906.3034). [Bibcode](/source/Bibcode_(identifier)):[2009JAHH...12...39B](https://ui.adsabs.harvard.edu/abs/2009JAHH...12...39B). [doi](/source/Doi_(identifier)):[10.3724/SP.J.1440-2807.2009.01.04](https://doi.org/10.3724%2FSP.J.1440-2807.2009.01.04).

1. **[^](#cite_ref-TriRpt18_11-0)** ["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_12-0)** 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-13)** [Stellarium](/source/Stellarium_(software)), citing Yi Shitong, 1981[12]

1. **[^](#cite_ref-Yang2024_14-0)** 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_15-0)** [Ridpath, Ian](/source/Ian_Ridpath). ["Star Tales - Draco"](http://ianridpath.com/startales/draco.html). Retrieved 10 May 2025.

1. **[^](#cite_ref-WGSN_16-0)** ["International Astronomical Union | IAU"](https://www.iau.org/science/scientific_bodies/working_groups/280/). *www.iau.org*. Retrieved 2018-01-16.

1. **[^](#cite_ref-IAU-CSN-new_17-0)** ["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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