45 Draconis

{{Short description|Star in the constellation Draco}}

{{about-distinguish|d Draconis|delta Draconis{{!}}δ Draconis}}

{{Starbox begin

|name= 45 Draconis

}}

{{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|34.52197}}{{cite DR2}}

| dec = {{DEC|+57|02|44.1416}}

| appmag_v = 4.78{{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=}}

|constell= Draco

}}

{{Starbox character

| class = F7Ib

| b-v = +0.59

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = −12.50{{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}}

| prop_mo_ra = 0.400

| prop_mo_dec = −7.674

| parallax = 0.9287

| p_error = 0.0913

| parallax_footnote =

| absmag_v = −3.5{{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}}

}}

{{Starbox detail

| mass = 8.2{{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}}

| radius = 62{{cite journal|bibcode= 2001A&A...367..521P|title= Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics|journal= Astronomy and Astrophysics|volume= 367|issue= 2|pages= 521|last1= Pasinetti Fracassini|first1= L. E.|last2= Pastori|first2= L.|last3= Covino|first3= S.|last4= Pozzi|first4= A.|year= 2001|doi= 10.1051/0004-6361:20000451|arxiv = astro-ph/0012289 |s2cid= 425754}}

| luminosity = 5,450{{cite journal|bibcode= 2012MNRAS.427..343M|title= Fundamental parameters and infrared excesses of Hipparcos stars|journal= Monthly Notices of the Royal Astronomical Society|volume= 427|pages= 343–357|last1= McDonald|first1= I.|last2= Zijlstra|first2= A. A.|last3= Boyer|first3= M. L.|year= 2012|issue= 1|doi= 10.1111/j.1365-2966.2012.21873.x|doi-access= free|arxiv = 1208.2037 |s2cid= 118665352}}

| temperature = 6,151

| gravity = 2.1 - 2.4

| metal_fe = −0.04

| rotational_velocity = 10

| age_myr = 33{{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}}

}}

{{Starbox catalog

| names = {{odlist | B=d Draconis | F=45 Dra | BD=+56°2113 | FK5=3475 | HD=171635 | HIP=90905 | HR=6978 | SAO=31039 }}{{cite simbad | title=d Dra | access-date=2018-07-24 }}

}}

{{Starbox reference

| Simbad=45+Draconis

}}

{{Starbox end}}

45 Draconis is a single{{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 }} star located in the northern circumpolar constellation of Draco, around 3,500 light years from the Earth. 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. Radial velocity measurements indicate it is moving closer to the Sun at the rate of −12.5 km/s.

Lyubimkov et al. (2012) assigned this star a stellar classification of F7Ib, matching an F-type supergiant. It is approximately 33 million years old with 8.2 times the mass of the Sun and about 62 times the Sun's radius. The star is radiating 5,450 times the Sun's luminosity from its photosphere at an effective temperature of 6,151 K.