# Rho Draconis

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Star in the constellation Draco

Rho Draconis Location of ρ Draconis (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Draco Right ascension 20h 02m 49.07085s[1] Declination +67° 52′ 24.8308″[1] Apparent magnitude (V) 4.52[2] Characteristics Evolutionary stage red giant branch[1] Spectral type K3 III[3] U−B color index +1.54[2] B−V color index +1.34[2] Astrometry Radial velocity (Rv) −9.80±0.43[4] km/s Proper motion (μ) RA: +15,824[1] mas/yr Dec.: +47.749[1] mas/yr Parallax (π) 7.5052±0.0993 mas[1] Distance 435 ± 6 ly (133 ± 2 pc) Absolute magnitude (MV) −0.97[5] Details Radius 28[3] R☉ Luminosity 402[6] L☉ Surface gravity (log g) 1.90[7] cgs Temperature 4370[7] K Metallicity [Fe/H] 0.03[7] dex Rotational velocity (v sin i) 10[8] km/s Other designations ρ Dra, 67 Dra, BD+67°1222, HD 190940, HIP 98702, HR 7685, SAO 18676[9] Database references SIMBAD data

**Rho Draconis** (**ρ Draconis**) is a solitary[10] [star](/source/Star) in the northern [circumpolar constellation](/source/Circumpolar_constellation) of [Draco](/source/Draco_(constellation)). It is faintly visible to the naked eye with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.52. Based upon an annual [parallax shift](/source/Stellar_parallax) of 7.5 [mas](/source/Milliarcsecond) as measured from Earth, it is located around 435 [light years](/source/Light_year) from the [Sun](/source/Sun). At that distance, the visual magnitude of the star is diminished by an [extinction factor](/source/Extinction_(astronomy)) of 0.027 due to [interstellar dust](/source/Interstellar_dust).[5]

With a [stellar classification](/source/Stellar_classification) of K3 III,[3] Rho Draconis is a normal [giant star](/source/Giant_star) that is past the first [dredge-up](/source/Dredge-up) phase of its post-[main sequence](/source/Main_sequence) [evolution](/source/Stellar_evolution).[7] It has the peculiar [spectrum](/source/Spectrum) of a [CN star](/source/CN_star), showing abnormal [line strengths](/source/Absorption_line) for [cyanogen](/source/Cyanogen) and calcium.[11] The star has expanded to around 28[3] times the [Sun's radius](/source/Sun's_radius) and it is radiating 402[6] times the [solar luminosity](/source/Solar_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 4,370 K.[7]

## References

1. ^ [***a***](#cite_ref-dr3_1-0) [***b***](#cite_ref-dr3_1-1) [***c***](#cite_ref-dr3_1-2) [***d***](#cite_ref-dr3_1-3) [***e***](#cite_ref-dr3_1-4) [***f***](#cite_ref-dr3_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%3D2249908073868915968%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Argue1966_2-0) [***b***](#cite_ref-Argue1966_2-1) [***c***](#cite_ref-Argue1966_2-2) Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **133** (4): 475–493, [Bibcode](/source/Bibcode_(identifier)):[1966MNRAS.133..475A](https://ui.adsabs.harvard.edu/abs/1966MNRAS.133..475A), [doi](/source/Doi_(identifier)):[10.1093/mnras/133.4.475](https://doi.org/10.1093%2Fmnras%2F133.4.475).

1. ^ [***a***](#cite_ref-PasinettiFracassini2001_3-0) [***b***](#cite_ref-PasinettiFracassini2001_3-1) [***c***](#cite_ref-PasinettiFracassini2001_3-2) [***d***](#cite_ref-PasinettiFracassini2001_3-3) Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", *Astronomy and Astrophysics*, **367** (3rd ed.): 521–524, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0012289](https://arxiv.org/abs/astro-ph/0012289), [Bibcode](/source/Bibcode_(identifier)):[2001A&A...367..521P](https://ui.adsabs.harvard.edu/abs/2001A&A...367..521P), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20000451](https://doi.org/10.1051%2F0004-6361%3A20000451), [S2CID](/source/S2CID_(identifier)) [425754](https://api.semanticscholar.org/CorpusID:425754).

1. **[^](#cite_ref-Famaey2005_4-0)** Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", *Astronomy and Astrophysics*, **430**: 165–186, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0409579](https://arxiv.org/abs/astro-ph/0409579), [Bibcode](/source/Bibcode_(identifier)):[2005A&A...430..165F](https://ui.adsabs.harvard.edu/abs/2005A&A...430..165F), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20041272](https://doi.org/10.1051%2F0004-6361%3A20041272), [S2CID](/source/S2CID_(identifier)) [17804304](https://api.semanticscholar.org/CorpusID:17804304).

1. ^ [***a***](#cite_ref-Ryon2009_5-0) [***b***](#cite_ref-Ryon2009_5-1) Ryon, Jenna; et al. (August 2009), "Comparing the Ca ii H and K Emission Lines in Red Giant Stars", *Publications of the Astronomical Society of the Pacific*, **121** (882): 842, [arXiv](/source/ArXiv_(identifier)):[0907.3346](https://arxiv.org/abs/0907.3346), [Bibcode](/source/Bibcode_(identifier)):[2009PASP..121..842R](https://ui.adsabs.harvard.edu/abs/2009PASP..121..842R), [doi](/source/Doi_(identifier)):[10.1086/605456](https://doi.org/10.1086%2F605456), [S2CID](/source/S2CID_(identifier)) [17821279](https://api.semanticscholar.org/CorpusID:17821279).

1. ^ [***a***](#cite_ref-mcdonald2012_6-0) [***b***](#cite_ref-mcdonald2012_6-1) McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", *Monthly Notices of the Royal Astronomical Society*, **427** (1): 343–357, [arXiv](/source/ArXiv_(identifier)):[1208.2037](https://arxiv.org/abs/1208.2037), [Bibcode](/source/Bibcode_(identifier)):[2012MNRAS.427..343M](https://ui.adsabs.harvard.edu/abs/2012MNRAS.427..343M), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2012.21873.x](https://doi.org/10.1111%2Fj.1365-2966.2012.21873.x), [S2CID](/source/S2CID_(identifier)) [118665352](https://api.semanticscholar.org/CorpusID:118665352).

1. ^ [***a***](#cite_ref-Mishenina1995_7-0) [***b***](#cite_ref-Mishenina1995_7-1) [***c***](#cite_ref-Mishenina1995_7-2) [***d***](#cite_ref-Mishenina1995_7-3) [***e***](#cite_ref-Mishenina1995_7-4) Mishenina, T. V.; et al. (October 1995), "Chemical composition of five giants with positive CN-indices.", *Astronomy and Astrophysics Supplement*, **113**: 333, [Bibcode](/source/Bibcode_(identifier)):[1995A&AS..113..333M](https://ui.adsabs.harvard.edu/abs/1995A&AS..113..333M).

1. **[^](#cite_ref-Bernacca1970_8-0)** Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", *Contributi Osservatorio Astronomico di Padova in Asiago*, **239** (1): 1, [Bibcode](/source/Bibcode_(identifier)):[1970CoAsi.239....1B](https://ui.adsabs.harvard.edu/abs/1970CoAsi.239....1B).

1. **[^](#cite_ref-SIMBAD_9-0)** ["rho Dra"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=rho+Dra). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-05-30.

1. **[^](#cite_ref-Eggleton2008_10-0)** Eggleton, P. P.; Tokovinin, A. A. (September 2008). ["A catalogue of multiplicity among bright stellar systems"](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x). *[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-Mishenina1997_11-0)** Mishenina, T. V.; Tsymbal, V. V. (September 1997), "Li and CNO abundances in the atmospheres of nine peculiar giants", *Astronomy Letters*, **23** (5): 609–614, [Bibcode](/source/Bibcode_(identifier)):[1997AstL...23..609M](https://ui.adsabs.harvard.edu/abs/1997AstL...23..609M).

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 [Rho Draconis](https://en.wikipedia.org/wiki/Rho_Draconis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Rho_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.