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HD 190228 - 版本历史
2026-07-19T18:25:17Z
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imported>Jimmy-bot：机器人: 尚未清空的已重定向分类（Cat:G-型次巨星→Cat:G型次巨星）
2024-06-25T08:49:43Z
<p>机器人: 尚未清空的已重定向分类（<a href="/index.php?title=Cat:G-%E5%9E%8B%E6%AC%A1%E5%B7%A8%E6%98%9F&action=edit&redlink=1" class="new" title="Cat:G-型次巨星（页面不存在）">Cat:G-型次巨星</a>→<a href="/index.php?title=Cat:G%E5%9E%8B%E6%AC%A1%E5%B7%A8%E6%98%9F&action=edit&redlink=1" class="new" title="Cat:G型次巨星（页面不存在）">Cat:G型次巨星</a>）</p>
<p><b>新页面</b></p><div>{{Starbox begin<br />
| name = [[Henry Draper catalogue|HD]] 190228<br />
}}<br />
{{Starbox observe<br />
| epoch = J2000.0<br />
| constell = [[狐狸座]]<br />
| ra = {{RA|20|03|00.7730}}<br />
| dec = {{DEC|+28|18|24.685}}<br />
| appmag_v = 7.307<br />
}}<br />
{{Starbox character<br />
| class = G5IV<br />
}}<br />
{{Starbox astrometry<br />
| parallax = 16.0<br />
| p_error = 0.6<br />
| parallax_footnote = <ref name="Sahlmann2010"/><br />
}}<br />
{{Starbox orbit<br />
| reference = <ref name="Sahlmann2010"/><br />
| inclination = 4.3{{±|1.8|1.0}}<br />
| node = 61.0{{±|22.7|22.9}}<br />
| period_unitless = 1146.0 ± 16.0 [[day|d]]<br />
| eccentricity = 0.50 ± 0.04<br />
| periarg_primary = 100.7 ± 3,2<br />
}}<br />
{{Starbox detail<br />
| component1 = HD 190228<br />
| mass = 0.83<ref name="Perrier2003"/><br />
| temperature = 5360 ± 40<ref name="Perrier2003"/><br />
| gravity = 4.02 ± 10<ref name="Perrier2003"/><br />
| metal = <nowiki>[Fe/H]</nowiki>=-0.24 ± 0.06<ref name="Perrier2003"/><br />
| component2 = HD 190228 b<br />
| mass2 = 0.0472 ± 0.0141<ref name="Sahlmann2010"/><br />
}}<br />
{{Starbox catalog<br />
| names = [[Bonner Durchmusterung|BD]]+27°&nbsp;3593, GCRV&nbsp;70273, [[Hipparcos catalogue|HIP]]&nbsp;98714, [[Smithsonian Astrophysical Observatory catalogue|SAO]]&nbsp;88118<br />
}}<br />
{{Starbox reference<br />
| Simbad = HD+190228<br />
| ARICNS = 04799<br />
| EPE = HD+190228<br />
}}<br />
{{Starbox end}}<br />
<br />
'''HD 190228'''是一顆位於[[狐狸座]]的恆星，視星等7.31，絕對星等3.34，距離地球約204光年。該恆星的年齡被認為高於100億年，屬於貧金屬恆星。<br />
<br />
2000年宣布在該恆星旁發現一顆質量下限是5倍木星質量的[[系外行星]]，編號 '''[[HD 190228 b]]'''<ref name="ESO2000"/>。該行星的狀況目前仍不明，因為母恆星金屬量並不高，而巨大行星較可能在金屬量高的恆星旁生成，因此有科學家認為它可能是[[棕矮星]]<ref name="Chen2001"/>。之後的天文測量也確認 HD 190228 b 的質量高達木星的49.4倍，是位於接近面對地球軌道上的棕矮星。該棕矮星環繞母恆星軌道週期是1146日，軌道離心率0.5<ref name="Sahlmann2010"/>。<br />
<br />
== 參考資料 ==<br />
{{Reflist|refs=<br />
<ref name="Chen2001">{{cite journal |bibcode=2001A&A...374L...1C |author=Chen ''et al.'' |title=The companion of HD 190228: Planet or brown dwarf? |journal=A&A |eprint= |year=2001 |volume=374 |issue=1 |pages=L1–L4 |doi=10.1051/0004-6361:20010790 |last2=Zhao |first2=G.}}</ref><br />
<br />
<ref name="ESO2000">{{cite web | title=European Southern Observatory: Six Extrasolar Planets Discovered | url=http://www.spaceref.com/news/viewpr.html?pid=2365 | date=7 August 2000 | work= | publisher=SpaceRef Interactive Inc. | accessdate=15 August 2009 }}</ref><br />
<br />
<ref name="Perrier2003">{{cite journal | url=http://www.aanda.org/articles/aa/full/2003/42/aa2924/aa2924.html | author=Perrier ''et al.'' | title=The ELODIE survey for northern extra-solar planets. I. Six new extra-solar planet candidates | journal=[[Astronomy and Astrophysics]] | year=2003 | volume=410 | issue=3 | pages=1039–1049 | doi=10.1051/0004-6361:20031340 | last2=Sivan | first2=J.-P. | last3=Naef | first3=D. | last4=Beuzit | first4=J. L. | last5=Mayor | first5=M. | last6=Queloz | first6=D. | last7=Udry | first7=S. | bibcode=2003A&A...410.1039P | arxiv=astro-ph/0308281 | access-date=2012-11-18 | archive-date=2019-06-26 | archive-url=https://web.archive.org/web/20190626005510/https://www.aanda.org/articles/aa/full/2003/42/aa2924/aa2924.html | dead-url=no }}</ref><br />
<br />
<ref name="Sahlmann2010">{{cite arXiv|eprint=1009.5991|class=astro-ph.EP|author=Johannes Sahlmann, Damien Segransan, Didier Queloz, Stephane Udry, Nuno C. Santos, Maxime Marmier, Michel Mayor, Dominique Naef, Francesco Pepe, Shay Zucker|title=Search for brown-dwarf companions of stars|year=2010|accessdate=2010-10-07}}</ref><br />
}}<br />
<br />
{{DEFAULTSORT:Hd 190228}}<br />
[[Category:G型次巨星]]<br />
[[Category:HD和HDE天體|190228]]<br />
[[Category:HIP天體|098714]]<br />
[[Category:狐狸座]]<br />
[[Category:棕矮星]]</div>
imported>Jimmy-bot