View source for HD 4628

{{short description|Star in the constellation Pisces}}
{{Starbox begin}}
{{Starbox observe
| epoch       = J2000
| constell    = [[Pisces (constellation)|Pisces]]
| ra          = {{RA|00|48|22.97596}}<ref name=DR3/>
| dec         = {{DEC|+05|16|50.2095}}<ref name=DR3/>
| appmag_v    = 5.74<ref name=Mermilliod1986/>
}}
{{Starbox character
| class       = K2.5&nbsp;V<ref name=aj132_1_161/>
| b-v         = +0.89<ref name=aj132_1_161/>
| u-b         = +0.60<ref name=aj132_1_161/>
| variable    =
}}
{{Starbox astrometry
| radial_v    = {{val|−10.37|0.12}}<ref name=DR3/>
| prop_mo_ra  = +755.894
| prop_mo_dec = {{val|-1141.019}}
| pm_footnote = <ref name=DR3/>
| parallax    = 134.4948
| p_error     = 0.0578
| parallax_footnote = <ref name=DR3/>
| absmag_v    = 6.37<ref name=Holmberg2009/>
}}
{{Starbox detail
| source      = <ref name="Soubiran2024"/>
| mass        = {{Val|0.778|0.007}}
| radius      = {{val|0.762|0.012}}
| luminosity  = {{val|0.292|0.007}}
| temperature = {{Val|5093|33|fmt=commas}}
| metal_fe    = {{val|-0.26|0.01}}
| gravity     = {{val|4.64|0.01}}
| rotation    = 38.0&nbsp;days<ref name=aaa521_A12/>
| age_gyr     = 5.4<ref name="MH08"/>
}}
{{Starbox catalog
| names = {{odlist | HD=4628 | Gould=96 G. Piscium<ref name=gould/> | BD=+04°123 | GCTP=156.00 | Gl=33 | HIP=3765 | HR=222 | LHS=121 | LTT=10285 | SAO=109471 | Wolf=25 }},  Lalande 1299<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad = HD+4628
}}
{{Starbox end}}
'''HD 4628''' ('''96 G. Piscium''') is a [[main sequence star]] in the equatorial [[constellation]] of [[Pisces (constellation)|Pisces]]. It has a [[spectral classification]] of K2.5&nbsp;V and an [[effective temperature]] of 5,055&nbsp;K, giving it an orange-red hue with a slightly smaller mass and girth than the [[Sun]]. HD 4628 lies at a distance of approximately 24.3 [[light year]]s from the Sun based on [[stellar parallax|parallax]].<ref name=DR3/> The [[apparent magnitude]] of 5.7<ref name=Mermilliod1986/> is just sufficient for this star to be viewed with the unaided eye. The star appears to be slightly older than the Sun&mdash;approximately 5.4 billion years in age.<ref name="MH08"/> The [[stellar magnetic field|surface activity]] is low and, based upon the detection of UV emission, it may have a relatively cool [[stellar corona|corona]] with a temperature of one million K.<ref name=aa291_2_517/>
The star has a relatively high [[proper motion]] of 1.4[[arcsecond|″]] per year and is moving in our general direction with a [[radial velocity]] of −10.4&nbsp;km/s.<ref name=DR3/> HD 4628 will make its closest approach to the Sun in about 32,000&nbsp;years, when it comes within {{Convert|7.3|pc|ly|lk=off|abbr=on|sigfig=1|order=flip}}.<ref name=aa575_A35/> No definitive companion has yet been found in orbit around this star. In 1958 it was thought to have stellar companion that was also a [[flare star]], but this was subsequently disproved.<ref name=Hartkpof1984/>
==References==
{{Reflist|refs=
<ref name=DR3>{{Cite Gaia DR3|2552925644460225152}}</ref>
<ref name=Holmberg2009>{{citation
| display-authors=1 | last1=Holmberg | first1=J.
| last2=Nordström | first2=B. | last3=Andersen | first3=J.
| title=The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics
| volume=501 | issue=3 |date=July 2009 | pages=941–947
| journal=Astronomy and Astrophysics
| doi=10.1051/0004-6361/200811191 | bibcode=2009A&A...501..941H
| arxiv=0811.3982 | s2cid=118577511 | postscript=. }}</ref>
<ref name=aaa521_A12>{{citation | display-authors=1 | last1=Maldonado | first1=J. | last2=Martínez-Arnáiz | first2=R. M. | last3=Eiroa | first3=C. | last4=Montes | first4=D. | last5=Montesinos | first5=B. | title=A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups | journal=Astronomy and Astrophysics | volume=521 | page=A12 |date=October 2010 | doi=10.1051/0004-6361/201014948 | bibcode=2010A&A...521A..12M |arxiv = 1007.1132 | s2cid=119209183 }}</ref>
<ref name="MH08">{{citation | last1=Mamajek | first1=Eric E. | last2=Hillenbrand | first2=Lynne A. | title=Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics | journal=The Astrophysical Journal | volume=687 | issue=2 | pages=1264–1293 |date=November 2008 | doi=10.1086/591785 | bibcode=2008ApJ...687.1264M |arxiv = 0807.1686 | s2cid=27151456 }}</ref>
<ref name="Soubiran2024">{{Citation |last=Soubiran |first=C. |last2=Creevey |first2=O. L. |last3=Lagarde |first3=N. |last4=Brouillet |first4=N. |last5=Jofré |first5=P. |last6=Casamiquela |first6=L. |last7=Heiter |first7=U. |last8=Aguilera-Gómez |first8=C. |last9=Vitali |first9=S. |last10=Worley |first10=C. |last11=de Brito Silva |first11=D. |date=2024-02-01 |title=Gaia FGK benchmark stars: Fundamental Teff and log g of the third version |bibcode=2024A&A...682A.145S |journal=Astronomy and Astrophysics |volume=682 |pages=A145 |doi=10.1051/0004-6361/202347136 |issn=0004-6361}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A%2BA/682/A145&HIP=HIP3765 HD 4628's database entry] at [[VizieR]].</ref>
<ref name=gould>{{citation|last=Gould |first=B. A. |title=Uranometria Argentina |publisher=Reprinted and updated by Pilcher, F |url=http://www.uranometriaargentina.com/ |access-date=2010-07-16 |url-status=dead |archive-url=https://web.archive.org/web/20120227032716/http://www.uranometriaargentina.com/ |archive-date=2012-02-27 }}</ref>
<!-- <ref name=apj720_2_1290>{{citation | display-authors=1 | last1=Ghezzi | first1=L. | last2=Cunha | first2=K. | last3=Smith | first3=V. V. | last4=de Araújo | first4=F. X. | last5=Schuler | first5=S. C. | last6=de la Reza | first6=R. | title=Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity | journal=The Astrophysical Journal | volume=720 | issue=2 | pages=1290–1302 |date=September 2010 | doi=10.1088/0004-637X/720/2/1290 | bibcode=2010ApJ...720.1290G |arxiv = 1007.2681 | s2cid=118565025 }}</ref> -->
<!-- <ref name="van Belle2009">{{cite journal | title=Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars | last1=van Belle | first1=Gerard T. | last2=von Braun | first2=Kaspar | journal=The Astrophysical Journal | volume=694 | issue=2 | pages=1085–1098 | date=2009 | arxiv=0901.1206 | bibcode=2009ApJ...694.1085V | doi=10.1088/0004-637X/694/2/1085 | s2cid=18370219 }}</ref> -->
<ref name=aj132_1_161>{{citation | display-authors=1 | 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=July 2006 | doi=10.1086/504637 | bibcode=2006AJ....132..161G | arxiv=astro-ph/0603770 | s2cid=119476992 }}</ref>
<ref name=SIMBAD>{{citation
| title=HD 4628 -- High proper-motion Star
| work=SIMBAD Astronomical Database
| publisher=[[Centre de Données astronomiques de Strasbourg]]
| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+4628
| access-date=2016-07-15 | postscript=. }}</ref>
<ref name=Hartkpof1984>{{citation
| last1=Hartkopf | first1=W. I. | last2=McAlister | first2=H. A.
| title=Binary stars unresolved by speckle interferometry. III
| journal=Publications of the Astronomical Society of the Pacific
| volume=96 | pages=105–116 | date=January 1984
| doi=10.1086/131309 | bibcode=1984PASP...96..105H | postscript=. | doi-access=free }}</ref>
<ref name=Mermilliod1986>{{citation
| last1=Mermilliod | first1=J.-C.
| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
| journal=Catalogue of Eggen's UBV Data. SIMBAD
| date=1986 | bibcode=1986EgUBV........0M | postscript=. }}</ref>
<ref name=aa575_A35>{{citation
| title=Close encounters of the stellar kind
| last1=Bailer-Jones | first1=C. A. L. | journal=Astronomy & Astrophysics
| volume=575 | id=A35 | pages=13 | date=March 2015
| doi=10.1051/0004-6361/201425221 | bibcode=2015A&A...575A..35B
| arxiv=1412.3648 | s2cid=59039482 | postscript=. }}</ref>
<ref name=aa291_2_517>{{citation
| display-authors=1 | last1=Mathioudakis | first1=M.
| last2=Drake | first2=J. J. | last3=Vedder | first3=P. W.
| last4=Schmitt | first4=J. H. M. M. | last5=Bowyer | first5=S.
| title=Detection of EUV emission from the low activity dwarf HD 4628: Evidence for a cool corona
| journal=Astronomy and Astrophysics
| volume=291 | issue=2 | pages=517–520 | date=November 1994
| bibcode=1994A&A...291..517M | postscript=. }}</ref>
}}
==External links==
* [http://www.solstation.com/stars/hr222.htm SolStation entry]
* [https://web.archive.org/web/20060827002820/http://www.ari.uni-heidelberg.de/aricns/cnspages/4c00066.htm ARICNS entry]
{{Stars of Pisces}}
{{Sky|00|48|22.98|+|05|16|50.2}}
{{DEFAULTSORT:HD 4628}}
[[Category:K-type main-sequence stars]]
[[Category:Solar-type stars|HD, 004628]]
[[Category:Pisces (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Gould objects|Piscium, 96]]
[[Category:Gliese and GJ objects|0033]]
[[Category:Henry Draper Catalogue objects|004628]]
[[Category:Hipparcos objects|003765]]
[[Category:Bright Star Catalogue objects|0222]]
[[Category:Wolf objects|0025]]