View source for HD 98617

{{Short description|Double star in the constellation Chamaeleon}}
{{Starbox begin
| name = [[Henry Draper Catalogue|HD]] 98617
}}
{{Starbox image
| image =
{{Location mark
| image = Chamaeleon constellation map.svg | float = center | width = 280
| label = | position = right
| mark = Red circle.svg | mark_width = 7 | mark_link = HD 98617
| x = 464 | y = 425
}}
| caption = Location of HD 98617 on the map (circled)
}}
{{Starbox observe
| epoch = J2000
| constell = [[Chamaeleon]]
| ra = {{RA|11|18|34.40370}}<ref name = GaiaDR3/>
| dec = {{DEC|-79|40|07.1370}}<ref name = GaiaDR3/>
| appmag_v = 6.35{{±|0.01}}<ref name = Tycho2000/>
}}
{{Starbox character
| type = [[main sequence]]<ref name = GaiaDR3/>
| class = A8 IIIm:<ref name = Houk1975/>
| b-v = +0.26<ref name = Johnson1966/>
| u-b = +0.08<ref name = Johnson1966/>
}}
{{Starbox astrometry
| radial_v = −4{{±|2.1}}<ref name = Gontcharov2006/>
| parallax = 15.7985
| p_error = 0.069
| parallax_footnote = <ref name = GaiaDR3/>
| prop_mo_ra = +46.293
| prop_mo_dec = −37.910
| pm_footnote = <ref name = GaiaDR3/>
| absmag_v = +2.42<ref name = Anderson2012/>
}}
{{Starbox detail
| mass = 1.75{{±|0.07}}<ref name = AP1999/>
| radius = 1.85{{±|0.06}}<ref name = Stassun2019/>
| luminosity = 8.41<ref name = Chanlder2016/>
| gravity = 4.20{{±|0.04}}<ref name = AP1999/>
| temperature = 7,540{{±|276}}<ref name = Bai2019/>
| metal_fe = −0.03<ref name = Gontcharov2012/>
| rotational_velocity =
| age_gyr = 1.06<ref name = Gontcharov2012/>
}}
{{Starbox catalog
| names = {{odlist|Gould = 30 G. Chamaeleontis<ref name = Gould1879/>|HD = 98617|CD = −78°457|CPD = −78°638|FK5 = 2904|GC = 15572|HIP = 55225|HR = 4385|SAO = 256823|WDS = J11186-7940AB}}<ref name = SIMBAD/>
}}
{{Starbox reference
| Simbad = HR+4385
}}
{{Starbox end}}
'''HD 98617''', also known '''HR 4385''', is a [[double star]] located in the southern [[circumpolar constellation]] [[Chamaeleon]]. The system has a combined [[apparent magnitude]] of 6.35,<ref name = Tycho2000/> placing it near the limit for [[naked eye]]. The system is located relatively close at a distance of 206 [[light year]]s<ref name = GaiaDR3/> but is approaching the [[Solar System]] with a fairly constrained [[radial velocity]] of {{val|-4|ul=km/s}}.<ref name = Gontcharov2006/> At its current distance, HD 98617 brightness is diminished by 0.29 magnitudes due to interstellar dust.<ref name = Gontcharov2017/>
The system's nature as a double star was first observed in a 1991 [[Hipparcos]] multiplicity survey. Their current separation is six-tenths of an [[arcsecond]], making it difficult to measure the properties of the individual components. Nevertheless, the 10th [[magnitude (astronomy)|magnitude]] companion is located along a [[position angle]] of 237° as of 2018.<ref name = Mason2001/>
The primary has a [[stellar classification]] of A8 IIIm:, indicating that it is an evolved [[Am star]] (with uncertainty).<ref name = Houk1975/> However, Renson and Manfroid (2009) lists its chemical peculiarity to be doubtful.<ref name = Renson2009/> It has 1.75 times the [[mass of the Sun]]<ref name = AP1999/> and 1.85 times its [[Solar radius|girth]].<ref name = Stassun2019/> It radiates 8.41 times the [[luminosity of the Sun]]<ref name = Chanlder2016/> from its [[photosphere]] at an [[effective temperature]] of {{val|7540|ul=K|fmt=commas}},<ref name = Bai2019/> giving it a white hue. It is estimated to be a [[billion years]] old and has a solar [[metallicity]].<ref name = Gontcharov2012/> The aforementioned parameters belong to an [[A-type main-sequence star]] instead of a [[giant star]] and Gaia DR3 even models it as such.<ref name = GaiaDR3/>
==References==
{{reflist||refs=
<ref name = GaiaDR3>{{Cite DR3|5199770777598476800}}</ref>
<ref name = Tycho2000>{{cite journal | last1 = Høg | first1 = E. | last2 = Fabricius | first2 = C. | last3 = Makarov | first3 = V. V. | last4 = Urban | first4 = S. | last5 = Corbin | first5 = T. | last6 = Wycoff | first6 = G. | last7 = Bastian | first7 = U. | last8 = Schwekendiek | first8 = P. | last9 = Wicenec | first9 = A. | title = The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics | date = March 2000 | volume = 355 | pages = L27–L30 | bibcode = 2000A&A...355L..27H | issn = 0004-6361}}</ref>
<ref name = Houk1975>{{cite book | last1 = Houk | first1 = N. | last2 = Cowley | first2 = A. P. | title = University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53° | year = 1975 | bibcode = 1975mcts.book.....H }}</ref>
<ref name = Johnson1966>{{cite journal | last1 = Johnson | first1 = H. L. | last2 = Mitchell | first2 = R. I. | last3 = Iriarte | first3 = B. | last4 = Wisniewski | first4 = W. Z. | title = UBVRIJKL Photometry of the Bright Stars | journal = Communications of the Lunar and Planetary Laboratory | year = 1966 | volume = 4 | pages = 99–110 | bibcode = 1966CoLPL...4...99J}}</ref>
<ref name = Gontcharov2006>{{cite journal | last1 = Gontcharov | first1 = G. A. | title = Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system | journal = Astronomy Letters | date = November 2006 | volume = 32 | issue = 11 | pages = 759–771 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773706110065 | pmid = | bibcode = 2006AstL...32..759G | arxiv = 1606.08053 | s2cid = 119231169 }}</ref>
<ref name = Anderson2012>{{cite journal | last1 = Anderson | first1 = E. | last2 = Francis | first2 = Ch. | title = XHIP: An extended hipparcos compilation | journal = Astronomy Letters | date = May 2012 | volume = 38 | issue = 5 | pages = 331–346 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773712050015 | bibcode = 2012AstL...38..331A | arxiv = 1108.4971| s2cid = 119257644 }}</ref>
<ref name = Stassun2019>{{cite journal | display-authors = 1 | last1 = Stassun | first1 = Keivan G. | last2 = Oelkers | first2 = Ryan J. | last3 = Paegert | first3 = Martin | last4 = Torres | first4 = Guillermo | last5 = Pepper | first5 = Joshua | last6 = Lee | first6 = Nathan De | last7 = Collins | first7 = Kevin | last8 = Latham | first8 = David W. | last9 = Muirhead | first9 = Philip S. | last10 = Chittidi | first10 = Jay | last11 = Rojas-Ayala | first11 = Bárbara | last12 = Fleming | first12 = Scott W. | last13 = Rose | first13 = Mark E. | last14 = Tenenbaum | first14 = Peter | last15 = Ting | first15 = Eric B. | last16 = Kane | first16 = Stephen R. | last17 = Barclay | first17 = Thomas | last18 = Bean | first18 = Jacob L. | last19 = Brassuer | first19 = C. E. | last20 = Charbonneau | first20 = David | last21 = Ge | first21 = Jian | last22 = Lissauer | first22 = Jack J. | last23 = Mann | first23 = Andrew W. | last24 = McLean | first24 = Brian | last25 = Mullally | first25 = Susan | last26 = Narita | first26 = Norio | last27 = Plavchan | first27 = Peter | last28 = Ricker | first28 = George R. | last29 = Sasselov | first29 = Dimitar | last30 = Seager | first30 = S. | last31 = Sharma | first31 = Sanjib | last32 = Shiao | first32 = Bernie | last33 = Sozzetti | first33 = Alessandro | last34 = Stello | first34 = Dennis | last35 = Vanderspek | first35 = Roland | last36 = Wallace | first36 = Geoff | last37 = Winn | first37 = Joshua N. | title = The Revised ''TESS'' Input Catalog and Candidate Target List | journal = The Astronomical Journal | date = 9 September 2019 | volume = 158 | issue = 4 | page = 138 | eissn = 1538-3881 | doi = 10.3847/1538-3881/ab3467 | bibcode = 2019AJ....158..138S | arxiv = 1905.10694 | doi-access = free}}</ref>
<ref name = Chanlder2016>{{cite journal | last1 = Chandler | first1 = Colin Orion | last2 = McDonald | first2 = Iain | last3 = Kane | first3 = Stephen R. | title = The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars | journal = The Astronomical Journal | date = 17 February 2016 | volume = 151 | issue = 3 | page = 59 | eissn = 1538-3881 | doi = 10.3847/0004-6256/151/3/59 | bibcode = 2016AJ....151...59C | arxiv = 1510.05666 | doi-access = free}}</ref>
<ref name = Bai2019>{{cite journal | last1 = Bai | first1 = Yu | last2 = Liu | first2 = JiFeng | last3 = Bai | first3 = ZhongRui | last4 = Wang | first4 = Song | last5 = Fan | first5 = DongWei | title = Machine-learning Regression of Stellar Effective Temperatures in the Second ''Gaia'' Data Release | journal = The Astronomical Journal | date = 2 August 2019 | volume = 158 | issue = 2 | page = 93 | eissn = 1538-3881 | doi = 10.3847/1538-3881/ab3048 | bibcode = 2019AJ....158...93B | arxiv = 1906.09695 | doi-access = free}}</ref>
<ref name = AP1999>{{cite journal |last1=Allende Prieto |first1=C. |last2=Lambert |first2=D. L. |title=Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures |journal=Astronomy and Astrophysics |date=December 1999 |volume=352 |pages=555–562 |issn=0004-6361 |bibcode=1999A&A...352..555A |arxiv=astro-ph/9911002}}</ref>
<ref name = Gontcharov2012>{{cite journal | last1 = Gontcharov | first1 = G. A. | title = Dependence of kinematics on the age of stars in the solar neighborhood | journal = Astronomy Letters | date = December 2012 | volume = 38 | issue = 12 | pages = 771–782 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773712120031 | bibcode = 2012AstL...38..771G | arxiv = 1606.08814 | doi-access = free}}</ref>
<ref name = Gould1879>{{cite journal | last = Gould | first = Benjamin Apthorp | title = Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas | journal = Resultados del Observatorio Nacional Argentino | volume = 1 | bibcode = 1879RNAO....1.....G | year = 1878}}</ref>
<ref name = Renson2009>{{cite journal | last1 = Renson | first1 = P. | last2 = Manfroid | first2 = J. | title = Catalogue of Ap, HgMn and Am stars | journal = Astronomy & Astrophysics | date = 19 March 2009 | volume = 498 | issue = 3 | pages = 961–966 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/200810788 | bibcode = 2009A&A...498..961R | doi-access = free}}</ref>
<ref name = SIMBAD>{{Cite simbad|title = HD 98617|access-date= October 19, 2022}}</ref>
<ref name = Gontcharov2017>{{cite journal | last1 = Gontcharov | first1 = George A. | last2 = Mosenkov | first2 = Aleksandr V. | title = Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars | journal = Monthly Notices of the Royal Astronomical Society | date = 28 September 2017 | volume = 472 | issue = 4 | pages = 3805–3820 | issn = 0035-8711 | eissn = 1365-2966 | doi = 10.1093/mnras/stx2219 | bibcode = 2017MNRAS.472.3805G | arxiv = 1709.01160 | doi-access = free}}</ref>
<ref name = Mason2001>{{cite journal | last1 = Mason | first1 = Brian D. | last2 = Wycoff | first2 = Gary L. | last3 = Hartkopf | first3 = William I. | last4 = Douglass | first4 = Geoffrey G. | last5 = Worley | first5 = Charles E. | title = The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog | journal = The Astronomical Journal | date = December 2001 | volume = 122 | issue = 6 | pages = 3466–3471 | issn = 0004-6256 | doi = 10.1086/323920 | bibcode = 2001AJ....122.3466M| doi-access = free}}</ref>
}}
{{Stars of Chamaeleon}}
[[Category:Double stars]]
[[Category:Henry Draper Catalogue objects|098617]]
[[Category:Hipparcos objects|055225]]
[[Category:Bright Star Catalogue objects|4385]]
[[Category:Chamaeleon]]
[[Category:Am stars]]
[[Category:Durchmusterung objects|CD-78 00457]]
[[Category:Gould objects|Chamaeleontis, 30]]
[[Category:A-type giants]]