{{Short description|Star in the constellation Draco}} {{about-distinguish|d Draconis|delta Draconis{{!}}δ Draconis}} {{Starbox begin}} {{Starbox image | image= {{Location mark |image=Draco constellation map.svg |float=center |alt= |label= |position=right |width=280 |mark=Red circle.svg |mark_width=10 |mark_link=45 Draconis |x=139|y=798 }} |caption=Location of 45 Dra (circled) }} {{Starbox observe | epoch = J2000 | ra = {{RA|18|32|34.52259}}<ref name=DR3/> | dec = {{DEC|+57|02|44.1458}}<ref name=DR3/> | appmag_v = 4.78<ref name=luck>{{cite journal|bibcode=2014AJ....147..137L|title=Parameters and Abundances in Luminous Stars|journal=The Astronomical Journal|volume=147|issue=6|pages=137|last1=Luck|first1=R. Earle|year=2014|doi=10.1088/0004-6256/147/6/137|doi-access=}}</ref> |constell= [[Draco (constellation)|Draco]] }} {{Starbox character | class = F7Ib<ref name=leonid/> | b-v = +0.59<ref name=luck/> | u-b = | variable = }} {{Starbox astrometry | radial_v = −12.50<ref name=Gontcharov2006>{{cite journal|bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|last1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 |s2cid=119231169}}</ref> | prop_mo_ra = 0.068 | prop_mo_dec = {{Val|-7.961}} | pm_footnote = <ref name=DR3/> | parallax = 1.0200 | p_error = 0.0583 | parallax_footnote = <ref name=DR3>{{cite DR3|2148205378601490688}}</ref> | absmag_v = −3.5<ref name=kovtyukh>{{cite journal|bibcode=2012MNRAS.423.3268K|arxiv=1204.4115|title=Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants|journal=Monthly Notices of the Royal Astronomical Society|volume=423|issue=4|pages=3268|last1=Kovtyukh|first1=V. V.|last2=Gorlova|first2=N. I.|last3=Belik|first3=S. I.|year=2012|doi=10.1111/j.1365-2966.2012.21117.x|doi-access=free |s2cid=118683158}}</ref> }} {{Starbox detail | mass = 8.2<ref name=leonid>{{cite journal|bibcode=2012MNRAS.427...11L|title=Lithium abundance in atmospheres of F- and G-type supergiants and bright giants|journal=Monthly Notices of the Royal Astronomical Society|volume=427|pages=11–26|last1=Lyubimkov|first1=Leonid S.|last2=Lambert|first2=David L.|last3=Kaminsky|first3=Bogdan M.|last4=Pavlenko|first4=Yakov V.|last5=Poklad|first5=Dmitry B.|last6=Rachkovskaya|first6=Tamara M.|year=2012|issue=1 |doi=10.1111/j.1365-2966.2012.21617.x|doi-access=free |arxiv = 1212.6057 |s2cid=119191810}}</ref> | radius = 102<ref name=DR2>{{cite DR2|2148205378601490688}}</ref> | luminosity = 12,700<ref name=DR2/> | temperature = 6,151<ref name=kovtyukh/> | gravity = 2.1<ref name=leonid/> - 2.4<ref name=kovtyukh/> | metal_fe = −0.04<ref name=kovtyukh/> | rotational_velocity = 10<ref name=leonid/> | age_myr = 33<ref name=leonid09>{{cite journal|bibcode=2010MNRAS.402.1369L|arxiv=0911.1335|title=Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood|journal=Monthly Notices of the Royal Astronomical Society|volume=402|issue=2|pages=1369|last1=Lyubimkov|first1=Leonid S.|last2=Lambert|first2=David L.|last3=Rostopchin|first3=Sergey I.|last4=Rachkovskaya|first4=Tamara M.|last5=Poklad|first5=Dmitry B.|year=2010|doi=10.1111/j.1365-2966.2009.15979.x|doi-access=free |s2cid=119096173}}</ref> }} {{Starbox catalog | names = {{odlist | B=d Draconis | F=45 Dra | BD=+56°2113 | FK5=3475 | HD=171635 | HIP=90905 | HR=6978 | SAO=31039 }}<ref name=SIMBAD>{{cite simbad | title=d Dra | access-date=2018-07-24 }}</ref> }} {{Starbox reference | Simbad=45+Draconis }} {{Starbox end}}
'''45 Draconis''' is a single<ref name=Eggleton2008>{{citation | 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 | postscript=. | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}</ref> star located in the northern [[circumpolar constellation]] of [[Draco (constellation)|Draco]], around 3,200 [[light year]]s from the Earth.<ref name=DR3/> ''45 Draconis'' is the [[Flamsteed designation]], while it has the [[Bayer designation]] of '''d Draconis'''. This object is visible to the naked eye as a faint, yellow-white hued star with an [[apparent visual magnitude]] of 4.78.<ref name=luck/> [[Radial velocity]] measurements indicate it is moving closer to the Sun at the rate of −12.5 km/s.<ref name=Gontcharov2006/>
This star has a [[stellar classification]] of F7Ib,<ref name=leonid/> matching an [[F-type star|F-type]] [[supergiant]]. It is approximately 33 million years old with 8.2 times the [[mass of the Sun]]<ref name=leonid/> and about 102 times the [[Sun's radius]]. The star is radiating 12,700 times the [[Sun's luminosity]] from its [[photosphere]]<ref name=DR2/> at an [[effective temperature]] of 6,151 K.<ref name=kovtyukh/>
==References== {{reflist}}
{{Stars of Draco}}
[[Category:F-type supergiants]] [[Category:Draco (constellation)]] [[Category:Bayer objects|Draconis, d]] [[Category:Durchmusterung objects|BD+56 2113]] [[Category:Flamsteed objects|Draconis, 45]] [[Category:Henry Draper Catalogue objects|171635]] [[Category:Hipparcos objects|090905]] [[Category:Bright Star Catalogue objects|6978]]