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HD 219828 - 版本历史
2026-07-19T07:17:53Z
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<p><b>新页面</b></p><div>{{Starbox short <br />
| name = [[Henry Draper catalogue|HD 219828]]<br />
| epoch = 2000<br />
| constell = [[飛馬座]]<br />
| ra = {{RA|23|18|46.7353}} <br />
| dec = {{DEC|+18|38|44.590}}<br />
| appmag_v = +8.04<br />
| dist_ly = 264.5<br />
| dist_pc = 81.1<br />
| spectral = G0IV <br />
| names = [[Bonner Durchmusterung|BD+17° 4896]], [[導引星表|GSC]] 01716-01182, [[Hipparcos catalogue|HIP 115100]], [[Smithsonian Astrophysical Observatory catalogue|SAO 108536]]<br />
| Simbad = HD+219828<br />
}} <br />
<br />
'''HD 219828'''是一個位於[[飛馬座]]的視星等8等恆星，距離地球約265光年。該恆星是黃[[次巨星]]，代表核心內的[[氫]][[核融合]]已經停止。<br />
<br />
==行星系統==<br />
2007年 Claudio Melo 在該恆星旁發現一顆質量相當於[[海王星]]的[[系外行星]]。根據相關論文作者所述，該行星可能是類似地球的岩石行星<ref name="Valencia">{{Cite journal | arxiv=astro-ph/0511150 | author=Valencia ''et al.'' | last2=Oconnell | first2=R | last3=Sasselov | first3=D | title=Internal structure of massive terrestrial planets| journal=[[伊卡洛斯 (期刊)|Icarus]] | volume=181| issue=2 | pages=545–554 | year=2006 | bibcode=2006Icar..181..545V | doi=10.1016/j.icarus.2005.11.021}}</ref>，半徑大約是地球的2.2倍。如果能進一步觀測到凌星現象，就可進一步證明，雖然目前仍是相當困難<ref name="Melo">{{Cite journal | arxiv=astro-ph/0702459 | author=Melo ''et al.'' | last2=Santos | first2=N. C. | last3=Gieren | first3=W. | last4=Pietrzynski | first4=G. | last5=Ruiz | first5=M. T. | last6=Sousa | first6=S. G. | last7=Bouchy | first7=F. | last8=Lovis | first8=C. | last9=Mayor | first9=M. | title=A new Neptune-mass planet orbiting HD 219828| journal=[[Astronomy and Astrophysics]] | volume=467| issue=2 | pages=721–727 | year=2007 | bibcode=2007A&A...467..721M | doi=10.1051/0004-6361:20066845}}</ref>。此外，軌道的最佳擬合解暗示有另一個質量相當於[[木星]]70%的行星存在，距離母恆星約0.68天文單位，並且是[[軌道離心率]]0.3的橢圓軌道。<br />
<br />
{{OrbitboxPlanet begin}}<br />
{{OrbitboxPlanet<br />
| exoplanet = [[HD 219828 b|b]]<br />
| mass = >0.066<br />
| period = 3.8335 ± 0.0013<br />
| semimajor = 0.052<br />
| eccentricity = 0<br />
}}<br />
{{OrbitboxPlanet hypothetical<br />
| exoplanet = [[HD 219828 c|c]]<br />
| mass = ≥0.7<br />
| period = ≥181<br />
| semimajor = ≈0.68<br />
| eccentricity = ≥0.3<br />
}}<br />
{{Orbitbox end}}<br />
<br />
== 參見 ==<br />
* [[HD 159868]]<br />
* [[確定存在的太陽系外行星列表]]<br />
<br />
== 參考資料 ==<br />
{{reflist}}<br />
<br />
== 外部連結 ==<br />
* {{cite web | url=http://exoplanet.eu/star.php?st=HD+219828 | title=HD 219828 | work=The Extrasolar Planets Encyclopaedia | accessdate=2012-05-24 | archive-date=2012-02-06 | archive-url=https://web.archive.org/web/20120206102205/http://exoplanet.eu/star.php?st=HD+219828 | dead-url=no }}<br />
{{Sky|23|18|46.7353|+|18|38|44.590|264.5}}<br />
<br />
{{DEFAULTSORT:Hd 219828}}<br />
[[Category:次巨星]]<br />
[[Category:HD和HDE天體|219828]]<br />
[[Category:HIP天體|115100]]<br />
[[Category:飛馬座]]<br />
[[Category:行星系]]</div>
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