{{Short description|Star in the constellation Centaurus}} {{Starbox begin}} {{Starbox observe | epoch = J2000.0 | constell = [[Centaurus]] | ra = {{RA|14|21|23.186}}<ref name=GaiaDR2/> | dec = {{DEC|−40|23|38.22}}<ref name=GaiaDR2/> | appmag_v = 9.03<ref name=Anderson_Francis_2012/> }} {{Starbox character | type = [[Main sequence]] | class = K4V(k)<ref name=Gray_et_al_2006/> | appmag_1_passband = B | appmag_1 = 10.137<ref name=Anderson_Francis_2012/> | appmag_2_passband = J | appmag_2 = {{val|7.097|0.021}}<ref name=Anderson_Francis_2012/> | appmag_3_passband = H | appmag_3 = {{val|6.608|0.026}}<ref name=Anderson_Francis_2012/> | appmag_4_passband = K | appmag_4 = {{val|6.447|0.023}}<ref name=Anderson_Francis_2012/> | r-i = | v-r = | b-v = {{val|1.107|0.006}}<ref name=Anderson_Francis_2012/> | u-b = | variable = }} {{Starbox astrometry | radial_v = {{val|+4.48|0.45}}<ref name=GaiaDR2/> | prop_mo_ra = −561.636<ref name=GaiaDR2/> | prop_mo_dec = −68.516<ref name=GaiaDR2/> | parallax = 35.4337 | p_error = 0.0762 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = 6.80<ref name=Anderson_Francis_2012/> }} {{Starbox detail | mass = 0.77<ref name=Luck2018/> | radius = {{val|0.73|0.02|0.03}}<ref name=GaiaDR2/> | gravity = 4.58<ref name=Luck2018/> | luminosity = 0.241<ref name=GaiaDR2/> | temperature = 4,672<ref name=Luck2018/> | metal_fe = 0.13<ref name=Luck2018/> | age_gyr = 8.17<ref name=Luck2018/> | rotational_velocity = 1.50<ref name="Ségransan2011"/> | rotation = {{Val|37.2|2.0|u=d}}<ref name=mnras452_3_2745/> }} {{Starbox catalog | names = {{odlist | CD=−39°8857 | GCRV=64739 | GJ=545.1 | HD=125595 | HIP=70170 | LHS=2900 | LPM=523 | LTT=5648 | NLTT=37029 | PPM=319432 }} }} {{Starbox reference | Simbad = HD+125595 | NSTED = HD 125595 | EPE = HD+125595 }} {{Starbox end}}
'''HD 125595''' is a [[star]] with a close [[Neptune|Neptunian]]<ref name="Ségransan2011"/> companion in the southern [[constellation]] of [[Centaurus]]. With an [[apparent visual magnitude]] of 9.03,<ref name=Anderson_Francis_2012/> this star is too faint to be viewed with the naked eye. It is located at a distance of 92 [[light year]]s from the [[Sun]] based on [[stellar parallax|parallax]] measurements, and is drifting further away with a [[radial velocity]] of +4.5 km/s.<ref name=GaiaDR2/> The star has a high [[proper motion]], traversing the [[celestial sphere]] and an [[angular rate]] of {{val|0.57|u=arcsecond yr<sup>−1</sup>}}.<ref name=Bakos_et_al_2002/>
This is an ordinary [[K-type main-sequence star]] with a [[stellar classification]] of K4V(k),<ref name=Gray_et_al_2006/> which indicates it is a small star that is generating energy at its [[stellar core|core]] through [[hydrogen fusion]]. It is about eight<ref name=Luck2018/> billion years old and is spinning with a [[projected rotational velocity]] of 1.5 km/s,<ref name="Ségransan2011"/> giving it a 37 day [[rotation period]].<ref name=mnras452_3_2745/> The star shows a moderate level of [[magnetic activity|chromospherically activity]] due to [[star spot]]s or [[Plage (astronomy)|plagues]].<ref name="Ségransan2011"/> It is smaller, cooler, dimmer, and less massive than the Sun, but shows a higher atmospheric metallicity.<ref name=Luck2018/>
==Planetary system== In 2018 an [[exoplanet]] companion was announced by the [[High Accuracy Radial Velocity Planet Searcher|HARPS]] program, using the [[radial velocity]] method. It is a Neptune-mass object orbiting {{convert|0.081|AU|Gm|abbr=on|lk=on}} from the host star with a [[orbital period|period]] of 9.7 days.<ref name="Ségransan2011"/>
{{OrbitboxPlanet begin | table_ref = <ref name="Ségransan2011"/> }} {{OrbitboxPlanet | exoplanet = b | mass = {{val|0.042|0.004|p=≥ }} | period = {{val|9.6737|0.0039}} | semimajor = {{val|0.0809|0.0014}} | eccentricity = 0.0 }} {{Orbitbox end}}
== See also == * [[List of extrasolar planets]]
== References == {{Reflist|refs=
<ref name=GaiaDR2>{{Cite Gaia DR2|6104435819513399168}}</ref>
<ref name=Anderson_Francis_2012>{{cite journal | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | title=XHIP: An extended hipparcos compilation | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | arxiv=1108.4971 | doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref>
<ref name=Luck2018>{{cite journal | title=Abundances in the Local Region. III. Southern F, G, and K Dwarfs | last1=Luck | first1=R. Earle | journal=The Astronomical Journal | volume=155 | issue=3 | id=111 | pages=31 | date=March 2018 | doi=10.3847/1538-3881/aaa9b5 | bibcode=2018AJ....155..111L | s2cid=125765376 | doi-access=free }}</ref>
<ref name=Gray_et_al_2006>{{Cite journal | last1=Gray | first1=R. O. | last2=Corbally | first2=C. J. | last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T. | last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E. | last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R. | title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample | journal=The Astronomical Journal | volume=132 | issue=1 | pages=161–170 | date=2006-07-01 | doi=10.1086/504637 | arxiv=astro-ph/0603770 | s2cid=119476992 | issn=0004-6256 | bibcode=2006AJ....132..161G }}</ref>
<ref name="Ségransan2011">{{cite journal | title=The HARPS search for southern extra-solar planets. XXIX. Four new planets in orbit around the moderately active dwarfs HD 63765, HD 104067, HD 125595, and HIP 70849 | url=http://www.aanda.org/articles/aa/full_html/2011/11/aa13580-09/aa13580-09.html | last1=Ségransan | first1=D. | last2=Mayor | first2=M. | last3=Udry | first3=S. | last4=Lovis | first4=C. | last5=Benz | first5=W. | last6=Bouchy | first6=F. | last7=Lo Curto | first7=G. | last8=Mordasini | first8=C. | last9=Moutou | first9=C. | last10=Naef | first10=D. | last11=Pepe | first11=F. | last12=Queloz | first12=D. | last13=Santos | first13=N. | display-authors=1 | journal=Astronomy and Astrophysics | volume=535 | at=A54 | date=2011 | arxiv=1107.0339 | bibcode=2011A&A...535A..54S | doi=10.1051/0004-6361/200913580 | s2cid=119197766 }}</ref>
<ref name=mnras452_3_2745>{{cite journal | last1=Suárez Mascareño | first1=A. | last2=Rebolo | first2=R. | last3=González Hernández | first3=J. I. | last4=Esposito | first4=M. | title=Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators | display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society | volume=452 | issue=3 | pages=2745–2756 | date=September 2015 | doi=10.1093/mnras/stv1441 | doi-access=free | bibcode=2015MNRAS.452.2745S | arxiv=1506.08039 | s2cid=119181646 }}</ref>
<ref name=Bakos_et_al_2002>{{cite journal | display-authors=1 | last1=Bakos | first1=Gáspár Á. | last2=Sahu | first2=Kailash C. | last3=Németh | first3=Péter | title=Revised Coordinates and Proper Motions of the Stars in the Luyten Half-Second Catalog | journal=The Astrophysical Journal Supplement Series | volume=141 | issue=1 | pages=187–193 | date=July 2002 | doi=10.1086/340115 | bibcode=2002ApJS..141..187B | arxiv=astro-ph/0202164 | s2cid=36667868 }}</ref>
}}
{{Sky|14|21|23.1859|-|40|23|38.211|89.4}}
{{Stars of Centaurus}}
{{DEFAULTSORT:HD 125595}} <!-- Properties --> [[Category:K-type main-sequence stars]] [[Category:Planetary systems with one confirmed planet]] <!-- Other --> [[Category:Centaurus]] [[Category:Durchmusterung objects]] [[Category:Henry Draper Catalogue objects|125595]] [[Category:Hipparcos objects|070170]]