{{Short description|Star in the constellation 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 158633 |x=380|y=645 }} | caption = Location of HD 158633 (circled in red) }} {{Starbox observe | epoch = J2000 | constell = [[Draco (constellation)|Draco]]<ref name=Anderson2012/> | ra = {{RA|17|25|00.09774}}<ref name=GaiaDR3/> | dec = {{DEC|+67|18|24.1487}}<ref name=GaiaDR3/> | appmag_v = 6.44<ref name=Anderson2012/> }} {{Starbox character | type = [[main sequence]]<ref name=GaiaDR3/> | class = K0 V<ref name=Anderson2012/> | b-v = +0.76<ref name="aaass129"/> | u-b = +0.29<ref name="aaass129"/> | variable = }} {{Starbox astrometry | radial_v = {{val|−38.71|0.08}}<ref name=Anderson2012/> | prop_mo_ra = −531.749<ref name=GaiaDR3/> | prop_mo_dec = +4.818<ref name=GaiaDR3/> | parallax = 78.1747 | p_error = 0.0226 | parallax_footnote = <ref name=GaiaDR3/> | absmag_v = 5.89<ref name=Kovtyukh2004/> }} {{Starbox detail | mass = 0.729<ref name="apj771_1_40"/> | radius = {{val|0.7891|0.0144}}<ref name="apj771_1_40"/> | luminosity = {{val|0.4090|0.0040}}<ref name="apj771_1_40"/> | temperature = {{val|5,203|46|fmt=commas}}<ref name="apj771_1_40"/> | metal_fe = {{val|−0.43|0.08}}<ref name="apj652"/> | rotational_velocity = 3.4<ref name=Earle2017/> | gravity = 4.80<ref name="apj131"/> | age_gyr = 4.27<ref name="apj652"/> }} {{Starbox catalog | names = {{odlist | GJ=675 | HR=6518 | BD=+67°1014 | HD=158633 | LHS=287 | LTT=15185 | GCTP=3972.00 | SAO=17474 | HIP=85235 }}<ref name="SIMBAD"/> }} {{Starbox reference | Simbad = HD+158633 }} {{Starbox end}}
'''HD 158633''' is a [[main sequence]] star in the northern [[constellation]] of [[Draco (constellation)|Draco]]. With an [[apparent visual magnitude]] of 6.43, this star is a challenge to view with the unaided eye but it can be seen clearly with a small [[telescope]]. Based upon [[Stellar parallax|parallax]] measurements, it is 42 [[light year]]s from the Sun. The star is drifting closer to the Sun with a [[radial velocity]] of −39 km/s,<ref name=Anderson2012/> and is predicted to come to within {{convert|8.112|pc|ly|1|adj=ri1|order=flip|abbr=on}} in around 190,400 years.<ref name=Bailer-Jones2018/>
This is a [[K-type main sequence star]] with a [[spectral classification]] of K0 V. It has about 79% of the [[solar radius|Sun's radius]] and 73% of the [[solar mass]].<ref name="apj771_1_40"/> It is an estimated 4.3 billion years old and is spinning with a [[projected rotational velocity]] of 3.4 km/s.<ref name=Earle2017/> The star is emitting an [[infrared excess|excess of infrared radiation]] at a wavelength of 70 μm, suggesting the presence of an orbiting [[debris disk]].<ref name="apj652"/> It has a low [[metallicity]], with only 37% of the Sun's abundance of elements more massive than helium,<ref name="apj652"/> and has a relatively high [[proper motion]].<ref name=GaiaDR3/>
==References== <references>
<ref name=GaiaDR3>{{Cite Gaia DR3|1637110042813188608}}</ref>
<ref name="SIMBAD">{{cite simbad | title=LHS 3287 | accessdate=2009-04-14 }}</ref>
<ref name=Earle2017>{{citation | title=Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants | last1=Luck | first1=R. Earle | journal=The Astronomical Journal | volume=153 | issue=1 | id=21 | pages=19 | date=January 2017 | bibcode=2017AJ....153...21L | arxiv=1611.02897 | doi=10.3847/1538-3881/153/1/21 | s2cid=119511744 | postscript=. | doi-access=free }}</ref>
<ref name=Bailer-Jones2018>{{citation | title=The completeness-corrected rate of stellar encounters with the Sun from the first Gaia data release | last=Bailer-Jones | first=C. A. L. | journal=Astronomy & Astrophysics | volume=609 | id=A8 | pages=16 | date=January 2018 | arxiv=1708.08595 | bibcode=2018A&A...609A...8B | doi=10.1051/0004-6361/201731453 | s2cid=119462489 }}</ref>
<ref name=Anderson2012>{{cite XHIP|85235}}</ref>
<ref name=Kovtyukh2004>{{cite journal | display-authors=1 | last1=Kovtyukh | first1=V. V. | last2=Soubiran | first2=C. | last3=Belik | first3=S. I. | title=A new Böhm-Vitense gap in the temperature range 5560 to 5610 K in the main sequence | journal=Astronomy and Astrophysics | volume=427 | date=2004 | issue=3 | pages=933–936 | bibcode=2004A&A...427..933K | arxiv=astro-ph/0409753 | doi=10.1051/0004-6361:20041449 | s2cid=204935981 }}</ref>
<ref name="aaass129">{{cite journal | last1=Hauck | first1=B. | last2=Mermilliod | first2=M. | journal=Astronomy and Astrophysics Supplement Series | volume=129 | pages=431–433 | date=1998 | title=uvbyβ photoelectric photometric catalogue | issue=3 | doi=10.1051/aas:1998195 | doi-access=free | bibcode=1998A&AS..129..431H }}</ref>
<ref name="apj771_1_40">{{citation | display-authors=1 | last1=Boyajian | first1=Tabetha S. | last2=von Braun | first2=Kaspar | last3=van Belle | first3=Gerard | last4=Farrington | first4=Chris | last5=Schaefer | first5=Gail | last6=Jones | first6=Jeremy | last7=White | first7=Russel | last8=McAlister | first8=Harold A. | last9=ten Brummelaar | first9=Theo A. | last10=Ridgway | first10=Stephen | last11=Gies | first11=Douglas | last12=Sturmann | first12=Laszlo | last13=Sturmann | first13=Judit | last14=Turner | first14=Nils H. | last15=Goldfinger | first15=P. J. | last16=Vargas | first16=Norm | title=Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations | journal=The Astrophysical Journal | volume=771 | issue=1 | id=40 | pages=31 | date=July 2013 | arxiv=1306.2974 | doi=10.1088/0004-637X/771/1/40 | bibcode=2013ApJ...771...40B | s2cid=14911430 | postscript=. }} See Table 3.</ref>
<ref name="apj131">{{cite journal |author1=Luck, R. Earle |author2=Heiter, Ulrike | title=Dwarfs in the Local Region | date=2006 | journal=The Astronomical Journal | volume=131 |issue=6 | pages=3069–3092 | doi=10.1086/504080 | bibcode=2006AJ....131.3069L | doi-access=free}}</ref>
<ref name="apj652">{{cite journal | author=Beichman, C. A. | display-authors=etal | title=New Debris Disks Around Nearby Main-Sequence Stars: Impact on the Direct Detection of Planets | journal=The Astrophysical Journal | volume=652 | issue=2 | pages=1674–1693 | doi=10.1086/508449 | date=2006 | bibcode=2006ApJ...652.1674B|arxiv = astro-ph/0611682 | s2cid=14207148 }}</ref>
</references>
{{Stars of Draco}} <!-- Properties --> [[Category:K-type main-sequence stars]] [[Category:Solar-type stars]] [[Category:Circumstellar disks]] <!-- Catalogues --> [[Category:Draco (constellation)]] [[Category:Durchmusterung objects|BD+67 1014]] [[Category:Gliese and GJ objects|0675]] [[Category:Henry Draper Catalogue objects|158633]] [[Category:Hipparcos objects|085235]] [[Category:Bright Star Catalogue objects|6518]]