{{short description|Binary star system in the constellation in the constellation of Draco}} {{Starbox begin}} {{Starbox image | image = {{Location mark |image=Draco constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=HD 151613 |x=450|y=890 }} | caption = Location of HD 151613 (circled in red) }} {{Starbox observe | epoch = J2000 | constell = [[Draco (constellation)|Draco]]<ref name=Anderson2012/> | ra = {{RA|16|45|17.88121}}<ref name=GaiaDR2/> | dec = {{DEC|+56|46|54.7985}}<ref name=GaiaDR2/> | appmag_v = 4.84<ref name=Anderson2012/> }} {{Starbox character | class = F2 V<ref name=abt2009/> | b-v = {{Val|0.375|0.013}}<ref name=Anderson2012/> | u-b = }} {{Starbox astrometry | radial_v = −2.0<ref name=Casagrande2011/> | prop_mo_ra = 24.85 | prop_mo_dec = 67.07 | parallax = 39.2932 | p_error = 0.3182 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = 2.71<ref name=Anderson2012/> }} {{Starbox orbit | reference = <ref name=Pourbaix2004/> | period_unitless = 363.57 d | eccentricity = 0.35 | periastron = 2415232.4 JD | periarg = 80.7 | k1 = 6.0 }} {{Starbox detail | source = | mass = 1.43<ref name=Casagrande2011/> | radius = 1.6<ref name=Cadars2001/> | luminosity = 6.91<ref name=Anderson2012/> | gravity = 4.05<ref name=Casagrande2011/> | temperature = 6,630<ref name=Reiners2006/> | metal_fe = −0.23<ref name=Casagrande2011/> | rotational_velocity = {{Val|47.5|2.4}}<ref name=Reiners2006/> | age_gyr = 2.30<ref name=Casagrande2011/> }} {{Starbox catalog | names = {{odlist | BD=+57°1702 | FK5=627 | GJ=9578 | HD=151613 | HIP=82020 | HR=6237 | SAO=30076 | WDS=16453+5647 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HD+151613 }} {{Starbox end}}
'''HD 151613''' is a [[binary star]]<ref name=Pourbaix2004/> system in the northern [[circumpolar constellation]] of [[Draco (constellation)|Draco]]. It is visible to the naked eye with an [[apparent visual magnitude]] of 4.84.<ref name=Anderson2012/> The distance to this star, as estimated from its annual [[stellar parallax|parallax shift]] of {{Val|39.3|ul=mas}},<ref name=GaiaDR2/> is 83 [[light year]]s. It is moving closer to the Earth with a heliocentric [[radial velocity]] of −2 km/s.<ref name=Casagrande2011/>
This is a single-lined [[spectroscopic binary]]<ref name=abt2009/> system with an [[orbital period]] of 363.57 days and an [[orbital eccentricity|eccentricity]] of 0.35.<ref name=Pourbaix2004/> The pair were resolved through [[speckle interferometry]] in 1977, showing an [[angular separation]] of {{Val|0.041|ul=arcsecond}}. They were later resolved in 1981 with a separation of {{Val|0.047|u=arcsecond}}, but were unresolved during 20 other attempts between 1976–1991.<ref name=Hartkopf2009/> The system is a source of [[X-ray astronomy|X-ray emission]].<ref name=Haakonsen2009/> The visible component is an [[F-type main-sequence star]] with a [[stellar classification]] of F2 V.<ref name=abt2009/> It is around 2.3 billion years old<ref name=Casagrande2011/> with a [[projected rotational velocity]] of 48 km/s.<ref name=Reiners2006/>
==References== <references> <ref name=SIMBAD>{{cite simbad | title=HD 151613 | access-date=2018-07-18 }}</ref>
<ref name=GaiaDR2>{{cite DR2}}</ref>
<ref name=abt2009>{{citation | last1=Abt | first1=Helmut A. | postscript=. | title=MK Classifications of Spectroscopic Binaries | journal=The Astrophysical Journal Supplement | volume=180 | issue=1 | pages=117–18 | date=2009 | doi=10.1088/0067-0049/180/1/117 | bibcode=2009ApJS..180..117A| s2cid=122811461 }}</ref>
<ref name=Reiners2006>{{citation | last1=Reiners | first1=Ansgar | title=Rotation- and temperature-dependence of stellar latitudinal differential rotation | journal=Astronomy and Astrophysics | volume=446 | issue=1 |date=January 2006 | pages=267–277 | doi=10.1051/0004-6361:20053911 | bibcode=2006A&A...446..267R |arxiv = astro-ph/0509399 | s2cid=8642707 }}</ref>
<ref name=Pourbaix2004>{{citation | display-authors=1 | last1=Pourbaix | first1=D. | last2=Tokovinin | first2=A. A. | last3=Batten | first3=A. H. | last4=Fekel | first4=F. C. | last5=Hartkopf | first5=W. I. | last6=Levato | first6=H. | last7=Morrell | first7=N. I. | last8=Torres | first8=G. | last9=Udry | first9=S. | year=2004 | pages=727–732 | volume=424 | title=SB9: The Ninth Catalogue of Spectroscopic Binary Orbits | journal=Astronomy & Astrophysics | postscript=. | bibcode=2004A&A...424..727P | doi=10.1051/0004-6361:20041213 | arxiv=astro-ph/0406573| s2cid=119387088 }}</ref>
<ref name=Casagrande2011>{{citation | display-authors=1 | last1=Casagrande | first1=L. | last2=Schönrich | first2=R. | last3=Asplund | first3=M. | last4=Cassisi | first4=S. | last5=Ramírez | first5=I. | last6=Meléndez | first6=J. | last7=Bensby | first7=T. | last8=Feltzing | first8=S. | title=New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey | journal=Astronomy and Astrophysics | volume=530 | page=A138 | date=June 2011 | doi=10.1051/0004-6361/201016276 | bibcode=2011A&A...530A.138C | arxiv=1103.4651 | s2cid=56118016 | postscript=. }}</ref>
<ref name=Haakonsen2009>{{citation | last1=Haakonsen | first1=Christian Bernt | last2=Rutledge | first2=Robert E. | title=XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources | journal=The Astrophysical Journal Supplement |volume=184 | issue=1 | pages=138–151 | date=September 2009 | doi=10.1088/0067-0049/184/1/138 | bibcode=2009ApJS..184..138H | arxiv=0910.3229 | s2cid=119267456 | postscript=. }}</ref>
<ref name=Hartkopf2009>{{citation | title=Speckle Interferometry at Mount Wilson Observatory: Observations Obtained in 2006-2007 and 35 New Orbits | last1=Hartkopf | first1=William I. | last2=Mason | first2=Brian D. | journal=The Astronomical Journal | postscript=. | volume=138 | issue=3 | pages=813–826 | date=September 2009 | doi=10.1088/0004-6256/138/3/813 | bibcode=2009AJ....138..813H | doi-access=free }}</ref>
<ref name=Cadars2001>{{citation | last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L. | last3=Covino | first3=S. | last4=Pozzi | first4=A. | title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition | journal=Astronomy and Astrophysics | volume=367 | issue=2 | pages=521–524 | date=February 2001 | bibcode=2001A&A...367..521P | doi=10.1051/0004-6361:20000451 | arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}</ref>
<ref name=Anderson2012>{{cite XHIP|82020|mode=cs2|postscript=.}}</ref> </references>
{{Stars of Draco}}
[[Category:F-type main-sequence stars]] [[Category:Spectroscopic binaries]] [[Category:Draco (constellation)]] [[Category:Durchmusterung objects|BD+57 1702]] [[Category:Gliese and GJ objects|9578]] [[Category:Henry Draper Catalogue objects|151613]] [[Category:Hipparcos objects|082020]] [[Category:Bright Star Catalogue objects|6237]]