64 Draconis

{{Short description|Star in the constellation Draco}} {{redirect-distinguish|e Draconis|ε Draconis}} {{Starbox begin}} {{Starbox image | image= {{Location mark |image=Draco constellation map.svg|alt=|float=center|width=260 |label=|position=right |mark=Red circle.svg|mark_width=8|mark_link=64 Dra |x=60|y=510 }} |caption=Location of 64 Draconis (circled) }} {{Starbox observe | epoch = J2000 | constell = [[Draco (constellation)|Draco]] | ra = {{RA|20|01|28.65587}}<ref name=GaiaDR2/> | dec = {{DEC|+64|49|15.5038}}<ref name=GaiaDR2/> | appmag_v = 5.27<ref name=ubv/> }} {{Starbox character | type = [[asymptotic giant branch|AGB]]<ref name=eggen1992/> | class = M1 III<ref name=perkins1989/> | b-v = {{Val|1.598|0.006}}<ref name=Anderson2012/> | u-b = }} {{Starbox astrometry | radial_v = {{Val|−36.12|0.13}}<ref name=Anderson2012/> | prop_mo_ra = −24.818<ref name=GaiaDR2/> | prop_mo_dec = +33.623<ref name=GaiaDR2/> | parallax = 7.2102 | p_error = 0.1296 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = −1.05<ref name=Anderson2012/> }} {{Starbox detail | source = | mass = 1.36<ref name=charbonnel2020/> | radius = 68<ref name=fetherolf2023/> | luminosity = 967<ref name=fetherolf2023/> | gravity = 1.16<ref name=tautvaišienė/> | temperature = 4,134<ref name=tautvaišienė/> | metal_fe = −0.89<ref name=tautvaišienė/> | rotational_velocity = | age_gyr = 5.4<ref name=tautvaišienė/> }} {{Starbox catalog | names = {{odlist | B=e Draconis | F=64 Dra | BD=+64°1405 | FK5=3604 | HD=190544 | HIP=98583 | HR=7676 | SAO=18658 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = 64+Dra }} {{Starbox end}}

'''64 Draconis''' is a single<ref name=Eggleton2008/> star in the northern [[circumpolar constellation]] of [[Draco (constellation)|Draco]], located 452 [[light year]]s away.<ref name=GaiaDR2/> It has the [[Bayer designation]] of '''e Draconis'''; ''64 Draconis'' is the [[Flamsteed designation]]. The object is visible to the naked eye as a dim, red-hued star with an [[apparent visual magnitude]] of 5.27.<ref name=ubv/> It is moving closer to the Earth with a heliocentric [[radial velocity]] of −36 km/s, and it is predicted to come as close as {{Convert|62.48|pc|ly|0|disp=out}} in around 4.3 million years.<ref name=Anderson2012/>

This is an [[stellar evolution|evolved]] [[red giant]] star with a [[stellar classification]] of M1 III,<ref name=perkins1989/> currently on the [[asymptotic giant branch]].<ref name=eggen1992/> It has expanded to about 68 times the [[Sun's radius]] and is radiating 967 times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of {{val|fmt=commas|4134|u=K}}. 64 Draconis forms a faint naked-eye pair with [[65 Draconis]] {{Val|12|u=arcminute}} away. The latter is a [[variable star|suspected variable]] with a brightness range in the [[Hipparcos]] photometric filter of 5.29 to 5.33.<ref name=gcvs/>

In [[Chinese language|Chinese]] astronomy, it belongs to the {{lang|zh|天廚}} ({{lang|zh-Latn|Tiān Chú}}) (''[[Purple Forbidden enclosure|Celestial Kitchen]]'') [[Asterism (astronomy)|asterism]].<ref name="Ridpath"/>

==References== <references> <ref name=SIMBAD>{{cite simbad | title=HD 40409 | access-date=2018-07-16 }}</ref>

<ref name=tautvaišienė>{{cite journal |last1=Tautvaišienė |first1=G. |last2=Mikolaitis |first2=Š. |last3=Drazdauskas |first3=A. |last4=Stonkutė |first4=E. |last5=Minkevičiūtė |first5=R. |last6=Pakštienė |first6=E. |last7=Kjeldsen |first7=H. |last8=Brogaard |first8=K. |last9=Chorniy |first9=Y. |last10=von Essen |first10=C. |last11=Grundahl |first11=F. |last12=Ambrosch |first12=M. |last13=Bagdonas |first13=V. |last14=Sharma |first14=A. |last15=Viscasillas Vázquez |first15=C. |title=Chemical Composition of Bright Stars in the Northern Hemisphere: Star-Planet Connection |journal=The Astrophysical Journal Supplement Series |date=2022 |volume=259 |issue=2 |page=45 |doi=10.3847/1538-4365/ac50b5 |doi-access=free |arxiv=2202.10102 |bibcode=2022ApJS..259...45T }}</ref>

<ref name=fetherolf2023>{{cite journal |last1=Fetherolf |first1=Tara |last2=Pepper |first2=Joshua |last3=Simpson |first3=Emilie |last4=Kane |first4=Stephen R. |last5=Močnik |first5=Teo |last6=English |first6=John Edward |last7=Antoci |first7=Victoria |last8=Huber |first8=Daniel |last9=Jenkins |first9=Jon M. |last10=Stassun |first10=Keivan |last11=Twicken |first11=Joseph D. |last12=Vanderspek |first12=Roland |last13=Winn |first13=Joshua N. |title=Variability Catalog of Stars Observed during the TESS Prime Mission |journal=The Astrophysical Journal Supplement Series |date=2023 |volume=268 |issue=1 |page=4 |doi=10.3847/1538-4365/acdee5 |doi-access=free |arxiv=2208.11721 |bibcode=2023ApJS..268....4F }}</ref>

<ref name=charbonnel2020>{{cite journal |last1=Charbonnel |first1=C. |last2=Lagarde |first2=N. |last3=Jasniewicz |first3=G. |last4=North |first4=P. L. |last5=Shetrone |first5=M. |last6=Krugler Hollek |first6=J. |last7=Smith |first7=V. V. |last8=Smiljanic |first8=R. |last9=Palacios |first9=A. |last10=Ottoni |first10=G. |title=Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era |journal=Astronomy and Astrophysics |date=2020 |volume=633 |pages=A34 |doi=10.1051/0004-6361/201936360 |arxiv=1910.12732 |bibcode=2020A&A...633A..34C }}</ref>

<ref name=Anderson2012>{{cite journal | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 }}</ref>

<ref name=perkins1989>{{cite journal | last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C. | title=The Perkins catalog of revised MK types for the cooler stars | journal=Astrophysical Journal Supplement Series | volume=71 | pages=245 | year=1989 | bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}</ref>

<ref name=eggen1992>{{cite journal | last1=Eggen | first1=Olin J. | title=Asymptotic giant branch stars near the sun | journal=The Astronomical Journal | volume=104 | pages=275 | year=1992 | doi=10.1086/116239 | bibcode=1992AJ....104..275E }}</ref>

<ref name=Eggleton2008>{{cite journal | title=A catalogue of multiplicity among bright stellar systems | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869 | date=2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}</ref>

<ref name=gcvs>{{cite journal | title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013) | journal=VizieR On-line Data Catalog | display-authors=etal | last1=Samus | first1=N. N. | last2=Durlevich | first2=O. V. | volume=1 | year=2009 | bibcode=2009yCat....102025S }}</ref>

<ref name=ubv>{{cite journal | title=VizieR On-line Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system | journal=CDS/ADC Collection of Electronic Catalogues | last1=Ducati | first1=J. R. | volume=2237 | year=2002 | bibcode=2002yCat.2237....0D }}</ref>

<ref name="Ridpath">{{cite web |last=Ridpath |first=Ian |author-link=Ian Ridpath |title=Star Tales - Draco |url=http://ianridpath.com/startales/draco.html |access-date=10 May 2025}}</ref> </references>

[[Category:M-type giants]] [[Category:Suspected variables]] [[Category:Draco (constellation)]] [[Category:Bayer objects|Draconis, 64]] [[Category:Durchmusterung objects|BD+64 1405]] [[Category:Henry Draper Catalogue objects|190544]] [[Category:Hipparcos objects|98583]] [[Category:Bright Star Catalogue objects|7676]] [[Category:Asymptotic-giant-branch stars]]