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| {{Starbox begin
| | Hello and welcome. My title is Numbers Wunder. Minnesota has usually been his home but his spouse desires them to transfer. To gather cash is what her family and her appreciate. For many years I've been working as a payroll clerk.<br><br>Also visit my page [http://citymama.com.ua/profile_info.php?ID=38588 home std test kit] |
| | name = [[Henry Draper Catalogue|HD]] 28185
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| }}
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| {{Starbox observe
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| | epoch = J2000.0
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| | constell = [[Eridanus (constellation)|Eridanus]]
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| | ra = {{RA|04|26|26.32}}<ref name="van Leeuwen2007"/>
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| | dec = {{DEC|–10|33|02.9}}<ref name="van Leeuwen2007"/>
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| | appmag_v = +7.81
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| | appmag_b = +8.52
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| }}
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| {{Starbox character
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| | class = G5V
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| | b-v = 0.750
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| | u-b = ?
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| | variable = none
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| }}
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| {{Starbox astrometry
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| | radial_v = 49.6
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| | prop_mo_ra = 84.42 ± 0.84<ref name="van Leeuwen2007"/>
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| | prop_mo_dec = –57.66 ± 0.72<ref name="van Leeuwen2007"/>
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| | parallax = 23.62
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| | p_error = 0.87
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| | parallax_footnote = <ref name="van Leeuwen2007"/>
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| | absmag_v = +4.68<ref group="note">Derived from apparent magnitude and parallax: <math>\scriptstyle M_V=m_V-5\log_{10}\left(\frac{100}{\pi}\right)</math></ref>
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| }}
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| {{Starbox detail
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| | metal = 173%
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| | mass = 0.99 ± 0.07
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| | radius = 1.04
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| | rotation = 30 days
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| | luminosity_visual = 1.15<ref group="note">Derived from absolute visual magnitude: <math>\scriptstyle \frac{L_\ast}{L_{\odot}}=100^{(M_{V_\odot}-M_{V_\ast})/5}</math></ref>
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| | temperature = 5705
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| | age_gyr = 7.5
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| }}
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| {{Starbox catalog
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| | names = [[Durchmusterung|BD]]–10°919, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 149631, [[Hipparcos#Published catalogues|HIP]] 20723, [[Guide Star Catalog|GSC]] 05317-00733
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| }}
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| {{Starbox reference
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| | Simbad = HD+28185
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| | EPE = HD+28185
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| }}
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| {{Starbox end}}
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| '''HD 28185''' is a [[yellow dwarf]] [[star]] similar to our [[Sun]] located about 138 [[light-years]] away from Earth in the [[constellation]] [[Eridanus (constellation)|Eridanus]]. The designation HD 28185 refers to its entry in the [[Henry Draper catalogue]]. The star is known to possess one long-[[orbital period|period]] [[extrasolar planet]].
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| ==Distance and visibility==
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| According to measurements from the [[Hipparcos]] [[astrometry|astrometric]] [[satellite]], HD 28185 has a [[parallax]] of 23.62 [[Minute of arc|milliarcsecond]]s,<ref name="van Leeuwen2007"/> which corresponds to a distance of 42 [[parsec]]s (138 [[light-year]]s). Since the star is located further than 25 parsecs from Earth, it is not listed in the [[Gliese Catalogue of Nearby Stars]]. With an [[apparent magnitude]] of 7.81, the star is not visible with the [[naked eye]], though it can be seen using [[binoculars]].
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| ==Stellar characteristics==
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| HD 28185 is similar to our Sun in terms of [[mass]], [[radius]], and [[luminosity]]. The star is on the [[main sequence]] and is generating [[energy]] by [[nuclear fusion|fusing]] [[hydrogen]] in its core. The [[stellar classification|spectral type]] of G5V implies HD 28185 is cooler than the Sun. Like the majority of extrasolar planet host stars, HD 28185 is [[metal-rich]] relative to the Sun, containing around 173% of the solar abundance of [[iron]]. The star rotates slower than the Sun, with a period of around 30 days, compared to 25.4 days for the Sun.
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| Based on the star's [[chromosphere|chromospheric activity]], HD 28185 is estimated to have an age of around 2,900 million years. On the other hand, [[stellar evolution|evolutionary models]] give an age of around 7,500 million years and a mass 0.99 times that of our Sun.<ref name="santos">{{cite journal | url=http://www.aanda.org/articles/aa/full/2001/45/aah3054/aah3054.html | author=Santos, N. et al. | title=The CORALIE survey for southern extra-solar planets VI. New long-period giant planets around HD 28185 and HD 213240 | journal=[[Astronomy and Astrophysics]] | volume=379 | year=2001 | issue=3 | pages=999–1004 | doi=10.1051/0004-6361:20011366 | bibcode=2001A&A...379..999S}}</ref> The higher luminosity and longer rotation period favour an older age for the star.
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| ==Planetary system==
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| In 2001 an [[extrasolar planet]] similar in size to Jupiter designated [[HD 28185 b]] was discovered in orbit around the star with a period of 1.04 years.<ref name="santos"/><ref name="eso0114"/> Unlike many long-period extrasolar planets, it has a low [[eccentricity (orbit)|orbital eccentricity]].<ref name="Butler2006"/> The planet experiences similar [[insolation]] to [[Earth]], which has led to speculations about the possibilities for [[planetary habitability|habitable]] [[natural satellite|moon]]s.<ref>{{cite web|url=http://nai.nasa.gov/news_stories/news_detail.cfm?ID=126|title=Extrasolar Planets with Earth-like Orbits|author=Mullen, L.|accessdate=22 July 2006|year=2001}}</ref><ref>{{cite journal|bibcode=2006ApJ...649.1010J|author=Jones, Barrie W.; Sleep, P. Nick; Underwood, David R.|title=Habitability of Known Exoplanetary Systems Based on Measured Stellar Properties|journal=[[The Astrophysical Journal]]|volume=649|issue=2|year=2006|pages=1010–1019|doi=10.1086/506557|arxiv = astro-ph/0603200 }}</ref> In addition, numerical simulations suggest that low-mass planets located in the gas giant's [[Trojan point]]s would be stable for long periods.<ref>{{cite journal|bibcode=2007A&A...474.1023S|title=Survey of the stability region of hypothetical habitable Trojan planets|author=Schwarz, R.; Dvorak, R.; Süli, Á.; Érdi, B.|journal=[[Astronomy and Astrophysics]]|volume=474|issue=3|pages=1023–1029|doi=10.1051/0004-6361:20077994|year=2007}}</ref> The planet's existence was independently confirmed by the [[Magellan Planet Search Program]] in 2008.<ref>{{cite journal | title=Low-Mass Companions for Five Solar-Type Stars From the Magellan Planet Search Program | journal=[[The Astrophysical Journal]] | url=http://iopscience.iop.org/0004-637X/693/2/1424/fulltext | year=2009 | volume=693 | issue=2 | pages=1424–1430 | doi=10.1088/0004-637X/693/2/1424 | display-authors=1 | last1=Minniti | first1=Dante | last2=Butler | first2=R. Paul | last3=López-Morales | first3=Mercedes | last4=Shectman | first4=Stephen A. | last5=Adams | first5=Fred C. | last6=Arriagada | first6=Pamela | last7=Boss | first7=Alan P. | last8=Chambers | first8=John E. | bibcode=2009ApJ...693.1424M|arxiv = 0810.5348 }}</ref>
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| The star also shows evidence of a long-term radial velocity trend, which may indicate the presence of an additional outer companion.<ref>{{cite journal|author=Chauvin, G.; Lagrange, A.-M.; Udry, S.; Fusco, T.; Galland, F.; Naef, D.; Beuzit, J.-L.; Mayor, M.|year=2006|journal=[[Astronomy and Astrophysics]]|volume=456|issue=3|pages=1165–1172|title=Probing long-period companions to planetary hosts. VLT and CFHT near infrared coronographic imaging surveys|bibcode=2006A&A...456.1165C|doi=10.1051/0004-6361:20054709|arxiv = astro-ph/0606166 }}</ref>
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| {{OrbitboxPlanet begin
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| | table_ref = <ref name="santos"/>}}
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| {{OrbitboxPlanet
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| | exoplanet = [[HD 28185 b|b]]
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| | mass = ≥5.7
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| | period = 383 ± 2
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| | semimajor = 1.031 ± 0.060
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| | eccentricity = 0.07 ± 0.04
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| }}
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| {{Orbitbox end}}
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| ==See also==
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| * [[51 Pegasi]]
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| * [[Iota Horologii]]
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| ==Notes==
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| <references group="note"/>
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| ==References==
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| {{Reflist|refs=
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| <ref name="Butler2006">{{cite journal | title=Catalog of Nearby Exoplanets | url=http://iopscience.iop.org/0004-637X/646/1/505/fulltext/ | last1=Butler | first1=R. P. | last2=Wright | first2=J. T. | last3=Marcy | first3=G. W. | last4=Fischer | first4=D. A. | last5=Vogt | first5=S. S. | last6=Tinney | first6=C. G. | last7=Jones | first7=H. R. A. | last8=Carter | first8=B. D. | last9=Johnson | first9=J. A. | last10=McCarthy | first10=C. | last11=Penny | first11=A. J. | display-authors=1 | journal=The Astrophysical Journal | volume=646 | issue=1 | pages=505–522 | year=2006 | doi=10.1086/504701 | bibcode=2006ApJ...646..505B | arxiv=astro-ph/0607493 }}</ref>
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| <ref name="eso0114">{{cite press release | title=Exoplanets: The Hunt Continues! | date=April 4, 2001 | publisher=European Southern Observatory | location=Garching, Germany | url=http://www.eso.org/public/news/eso0114/ | accessdate=December 27, 2012 }}</ref>
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| <ref name="van Leeuwen2007">{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }}[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=20670 Vizier catalog entry ] </ref>
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| }}
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| ==External links==
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| * [http://www.extrasolar.net/startour.asp?StarCatId=normal&StarId=130 '''Extrasolar Visions''': HD 28185]
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| {{Sky|04|26|26.3205|-|10|33|02.955|138}}
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| {{Good article}}
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| {{Stars of Eridanus}}
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| [[Category:Eridanus (constellation)]]
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| [[Category:G-type main-sequence stars]]
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| [[Category:Henry Draper Catalogue objects|028185]]
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| [[Category:Hipparcos objects|020723]]
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| [[Category:Planetary systems]]
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Hello and welcome. My title is Numbers Wunder. Minnesota has usually been his home but his spouse desires them to transfer. To gather cash is what her family and her appreciate. For many years I've been working as a payroll clerk.
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