# CL Draconis

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Star in the constellation Draco

CL Draconis CL Draconis (circled), with the obsolete constellation Quadrans Muralis in the background. Observation data Epoch J2000 Equinox J2000 Constellation Draco Right ascension 15h 57m 47.44066s[1] Declination +54° 44′ 59.1496″[1] Apparent magnitude (V) 4.96[2] Characteristics Evolutionary stage main sequence[1] Spectral type F0 IV[3] B−V color index 0.269±0.008[2] Variable type δ Sct[4] Astrometry Radial velocity (Rv) −11.0±4.2[5] km/s Proper motion (μ) RA: −151.009[1] mas/yr Dec.: +107.081[1] mas/yr Parallax (π) 29.6204±0.0809 mas[1] Distance 110.1 ± 0.3 ly (33.76 ± 0.09 pc) Absolute magnitude (MV) 2.33[2] Details Mass 1.68±0.01[6] M☉ Luminosity 10.2+0.2 −0.3[6] L☉ Surface gravity (log g) 4.04±0.14[7] cgs Temperature 7,439±253[7] K Metallicity [Fe/H] 0.04±0.10[8] dex Rotational velocity (v sin i) 165[6] km/s Age 643[7] Myr Other designations CL Dra, AG+54°1023, BD+55°1793, FK5 595, HD 143466, HIP 78180, HR 5960, SAO 29727[9] Database references SIMBAD data

**CL Draconis** is a single[10] [star](/source/Star) in the northern [circumpolar constellation](/source/Circumpolar_constellation) of [Draco](/source/Draco_(constellation)). It can be viewed with the naked eye, having an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.96.[2] The distance to this star, as determined from its annual [parallax shift](/source/Stellar_parallax) of 29.6 [mas](/source/Milliarcsecond),[1] is 110 [light years](/source/Light_year). It is moving closer to the Earth with a heliocentric [radial velocity](/source/Radial_velocity) of −11 km/s.[5] The star has a relatively high [proper motion](/source/Proper_motion), traversing the [celestial sphere](/source/Celestial_sphere) at the rate of 0.185[″](/source/Second_of_arc)/yr.[11]

Based upon a [stellar classification](/source/Stellar_classification) of F0 IV,[3] this is an aging [F-type](/source/F-type_star) [subgiant star](/source/Subgiant_star) that has consumed the hydrogen at its [core](/source/Stellar_core). It is spinning rapidly with a [projected rotational velocity](/source/Projected_rotational_velocity) of 165 km/s,[6] giving it an [oblate shape](/source/Oblate_spheroid) with an [equatorial bulge](/source/Equatorial_bulge) that is estimated to be 8% larger than the polar radius.[12]

caption=Visual band light curves for CL Draconis, adapted from DuPuy and Burgoyne (1983)[13]

CL Draconis is a [Delta Scuti](/source/Delta_Scuti) variable, changing brightness with an [amplitude](/source/Amplitude) of 0.010 magnitude over a period of 1.83 hours.[14] CL Dra has 1.68[6] times the [mass of the Sun](/source/Mass_of_the_Sun) and is radiating 10.2[6] times the [Sun's luminosity](/source/Sun's_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 7,439 K.[7]

It was transferred from [Draco](/source/Draco_(constellation)) to [Quadrans Muralis](/source/Quadrans_Muralis). Later when the [International Astronomical Union](/source/International_Astronomical_Union) officially recognised constellations, Quadrans Muralis became [obsolete](/source/Obsolete_constellations), so this star was moved back to Draco.

## 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) [***g***](#cite_ref-GaiaDR3_1-6) 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%3D1597350774639252352%26-go+%25%23Sesame%23%25%26) 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) 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-Cowley1969_3-0) [***b***](#cite_ref-Cowley1969_3-1) Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", *Astronomical Journal*, **74**: 375–406, [Bibcode](/source/Bibcode_(identifier)):[1969AJ.....74..375C](https://ui.adsabs.harvard.edu/abs/1969AJ.....74..375C), [doi](/source/Doi_(identifier)):[10.1086/110819](https://doi.org/10.1086%2F110819).

1. **[^](#cite_ref-gcvs_4-0)** Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", *Astronomy Reports*, **61** (1): 80, [Bibcode](/source/Bibcode_(identifier)):[2017ARep...61...80S](https://ui.adsabs.harvard.edu/abs/2017ARep...61...80S), [doi](/source/Doi_(identifier)):[10.1134/S1063772917010085](https://doi.org/10.1134%2FS1063772917010085), [S2CID](/source/S2CID_(identifier)) [125853869](https://api.semanticscholar.org/CorpusID:125853869).

1. ^ [***a***](#cite_ref-deBruijne2012_5-0) [***b***](#cite_ref-deBruijne2012_5-1) de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", *Astronomy & Astrophysics*, **546**: 14, [arXiv](/source/ArXiv_(identifier)):[1208.3048](https://arxiv.org/abs/1208.3048), [Bibcode](/source/Bibcode_(identifier)):[2012A&A...546A..61D](https://ui.adsabs.harvard.edu/abs/2012A&A...546A..61D), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201219219](https://doi.org/10.1051%2F0004-6361%2F201219219), [S2CID](/source/S2CID_(identifier)) [59451347](https://api.semanticscholar.org/CorpusID:59451347), A61.

1. ^ [***a***](#cite_ref-zorec2012_6-0) [***b***](#cite_ref-zorec2012_6-1) [***c***](#cite_ref-zorec2012_6-2) [***d***](#cite_ref-zorec2012_6-3) [***e***](#cite_ref-zorec2012_6-4) [***f***](#cite_ref-zorec2012_6-5) Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", *Astronomy & Astrophysics*, **537**: A120, [arXiv](/source/ArXiv_(identifier)):[1201.2052](https://arxiv.org/abs/1201.2052), [Bibcode](/source/Bibcode_(identifier)):[2012A&A...537A.120Z](https://ui.adsabs.harvard.edu/abs/2012A&A...537A.120Z), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201117691](https://doi.org/10.1051%2F0004-6361%2F201117691), [S2CID](/source/S2CID_(identifier)) [55586789](https://api.semanticscholar.org/CorpusID:55586789)

1. ^ [***a***](#cite_ref-David2015_7-0) [***b***](#cite_ref-David2015_7-1) [***c***](#cite_ref-David2015_7-2) [***d***](#cite_ref-David2015_7-3) David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", *The Astrophysical Journal*, **804** (2): 146, [arXiv](/source/ArXiv_(identifier)):[1501.03154](https://arxiv.org/abs/1501.03154), [Bibcode](/source/Bibcode_(identifier)):[2015ApJ...804..146D](https://ui.adsabs.harvard.edu/abs/2015ApJ...804..146D), [doi](/source/Doi_(identifier)):[10.1088/0004-637X/804/2/146](https://doi.org/10.1088%2F0004-637X%2F804%2F2%2F146), [S2CID](/source/S2CID_(identifier)) [33401607](https://api.semanticscholar.org/CorpusID:33401607).

1. **[^](#cite_ref-Gaspar2016_8-0)** Gáspár, András; et al. (August 2016), "The Correlation between Metallicity and Debris Disk Mass", *The Astrophysical Journal*, **826** (2): 14, [arXiv](/source/ArXiv_(identifier)):[1604.07403](https://arxiv.org/abs/1604.07403), [Bibcode](/source/Bibcode_(identifier)):[2016ApJ...826..171G](https://ui.adsabs.harvard.edu/abs/2016ApJ...826..171G), [doi](/source/Doi_(identifier)):[10.3847/0004-637X/826/2/171](https://doi.org/10.3847%2F0004-637X%2F826%2F2%2F171), [S2CID](/source/S2CID_(identifier)) [119241004](https://api.semanticscholar.org/CorpusID:119241004), 171.

1. **[^](#cite_ref-SIMBAD_9-0)** ["CL Dra"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=CL+Dra). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 3 September 2018.

1. **[^](#cite_ref-Eggleton2008_10-0)** 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-Lepine2005_11-0)** Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", *The Astronomical Journal*, **129** (3): 1483–1522, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0412070](https://arxiv.org/abs/astro-ph/0412070), [Bibcode](/source/Bibcode_(identifier)):[2005AJ....129.1483L](https://ui.adsabs.harvard.edu/abs/2005AJ....129.1483L), [doi](/source/Doi_(identifier)):[10.1086/427854](https://doi.org/10.1086%2F427854), [S2CID](/source/S2CID_(identifier)) [2603568](https://api.semanticscholar.org/CorpusID:2603568).

1. **[^](#cite_ref-vanBelle2012_12-0)** van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", *The Astronomy and Astrophysics Review*, **20** (1): 51, [arXiv](/source/ArXiv_(identifier)):[1204.2572](https://arxiv.org/abs/1204.2572), [Bibcode](/source/Bibcode_(identifier)):[2012A&ARv..20...51V](https://ui.adsabs.harvard.edu/abs/2012A&ARv..20...51V), [doi](/source/Doi_(identifier)):[10.1007/s00159-012-0051-2](https://doi.org/10.1007%2Fs00159-012-0051-2), [S2CID](/source/S2CID_(identifier)) [119273474](https://api.semanticscholar.org/CorpusID:119273474).

1. **[^](#cite_ref-DuPuy_13-0)** DuPuy, D. L.; Burgoyne, L. G. (January 1983). ["HR 5960: new observations and period search"](https://doi.org/10.1086%2F131118). *Publications of the Astronomical Society of the Pacific*. **95**: 61–68. [Bibcode](/source/Bibcode_(identifier)):[1983PASP...95...61D](https://ui.adsabs.harvard.edu/abs/1983PASP...95...61D). [doi](/source/Doi_(identifier)):[10.1086/131118](https://doi.org/10.1086%2F131118). [S2CID](/source/S2CID_(identifier)) [127849050](https://api.semanticscholar.org/CorpusID:127849050).

1. **[^](#cite_ref-Rodríguez2000_14-0)** Rodríguez, E.; et al. (June 2000), "A revised catalogue of δ Sct stars", *Astronomy and Astrophysics Supplement*, **144** (3): 469–474, [Bibcode](/source/Bibcode_(identifier)):[2000A&AS..144..469R](https://ui.adsabs.harvard.edu/abs/2000A&AS..144..469R), [doi](/source/Doi_(identifier)):[10.1051/aas:2000221](https://doi.org/10.1051%2Faas%3A2000221), [hdl](/source/Hdl_(identifier)):[10261/226673](https://hdl.handle.net/10261%2F226673).

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 [CL Draconis](https://en.wikipedia.org/wiki/CL_Draconis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/CL_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.