imported>Jimmy-bot：机器人: 尚未清空的已重定向分类（Cat:橙矮星→Cat:K型主序星）

2024-06-25T11:24:41Z

机器人: 尚未清空的已重定向分类（Cat:橙矮星→Cat:K型主序星）

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{{Starbox begin
| name = [[HD星表|HD]] 27894
}}
{{Starbox observe
| epoch = [[J2000.0]]
| constell = [[网罟座]]
| ra = {{RA|04|20|47.04716}}<ref name=aaa474_2_653/>
| dec = {{DEC|–59|24|39.0184}}<ref name=aaa474_2_653/>
| appmag_v = 9.42
}}
{{Starbox character
| class = K2 V<ref name=houk1979/>
| b-v = +1.005<ref name=SIMBAD/>
| u-b = +0.90<ref name=SIMBAD/>
| variable =
}}
{{Starbox astrometry
| radial_v =
| parallax = 22.79
| p_error = 0.85
| parallax_footnote = <ref name=aaa474_2_653/>
| prop_mo_ra = +182.16<ref name=aaa474_2_653/>
| prop_mo_dec = +271.77<ref name=aaa474_2_653/>
| absmag_v =
}}
{{Starbox detail
| mass = {{nowrap|0.86 ± 0.06}}<ref name=aaa535_A42/>
| radius =
| luminosity =
| temperature = {{nowrap|4920 ± 45}}<ref name=aaa535_A42/>
| gravity = {{nowrap|4.54 ± 0.05}}<ref name=aaa535_A42/>
| metal_fe = +0.20<ref name=aaa487_1_373/>
| age = {{nowrap|7.7 ± 2.3}}<ref name=aaa535_A42/>
| rotational_velocity =
}}
{{ Starbox catalog
| names = [[Durchmusterung|CD]]-59 829, [[Henry Draper Catalogue|HD]] 27894, [[Hipparcos catalogue|HIP]] 20277, [[Luyten Two-Tenths catalogue|LTT]] 1953.<ref name=SIMBAD/>
}}
{{Starbox end}}
'''HD 27894'''是[[网罟座]]中一颗9[[视星等|等]][[恒星]]，位于大约138[[光年]]之外。它是一颗[[橙矮星]]，[[恒星分类|光谱类型]]为K2V，它的温度和光度都比我们的太阳低。

2005年，[[日内瓦系外行星探测小组]]宣布发现了它的一颗[[太阳系外行星]]<ref name="Moutou">{{cite journal | url=http://www.aanda.org/articles/aa/full/2005/31/aa2826-05/aa2826-05.html | author=Moutou | title=The HARPS search for southern extra-solar planets IV. Three close-in planets around HD 2638, HD 27894 and HD 63454 | journal=[[Astronomy and Astrophysics]] | year=2005 | volume=439 | issue=1 | pages=367–373 | doi=10.1051/0004-6361:20052826 | last2=Mayor | first2=M. | last3=Bouchy | first3=F. | last4=Lovis | first4=C. | last5=Pepe | first5=F. | last6=Queloz | first6=D. | last7=Santos | first7=N. C. | last8=Udry | first8=S. | last9=Benz | first9=W. | bibcode=2005A&A...439..367M | display-authors=2 | access-date=2012-03-29 | archive-date=2019-08-05 | archive-url=https://web.archive.org/web/20190805051841/https://www.aanda.org/articles/aa/full/2005/31/aa2826-05/aa2826-05.html | dead-url=no }}</ref>。2017年，天文學家宣布在該恆星旁再發現2顆系外行星。其中一顆較晚發現的行星與較早的行星一樣極為靠近母恆星，另外一顆則明顯遠離母恆星許多。這是天文學家首次發現行星系統內各行星軌道之間有如此巨大空隙的例子<ref>{{cite arxiv|eprint=1706.00509|last1= Trifonov|first1= T.|title= Three planets around HD 27894. A close-in pair with a 2:1 period ratio and an eccentric Jovian planet at 5.4 AU|last2= Kürster|first2= M.|last3= Zechmeister|first3= M.|last4= Zakhozhay|first4= O. V.|last5= Reffert|first5= S.|last6= Lee|first6= M. H.|last7= Rodler|first7= F.|last8= Vogt|first8= S. S.|last9= Brems|first9= S. S.|class= astro-ph.EP|year= 2017}}</ref><ref>{{cite news|url=https://phys.org/news/2017-06-massive-planets-star-hd.html|title=Two new massive planets detected around the star HD 27894|author=Tomasz Nowakowski|date=June 12, 2017|accessdate=June 12, 2017|archive-date=2020-10-23|archive-url=https://web.archive.org/web/20201023111425/https://phys.org/news/2017-06-massive-planets-star-hd.html|dead-url=no}}</ref>。

{{OrbitboxPlanet begin
| table_ref =<ref name="Moutou"/> }}
{{OrbitboxPlanet
| exoplanet = [[HD 27894 b|b]]
| mass = >0.66
| period = 18.02 ± 0.02
| semimajor = 0.125
| eccentricity = 0.047 ± 0.010
}}
{{OrbitboxPlanet
| exoplanet = [[HD 27894 c|c]]
| mass = >0.16
| period = 36.1 ± 0.2
| semimajor = 0.198
| eccentricity = 0.02 ± 0.02
}}
{{OrbitboxPlanet
| exoplanet = [[HD 27894 d|d]]
| mass = >5.4
| period = 5200 ± 100
| semimajor = 5.4
| eccentricity = 0.39 ± 0.05
}}
{{Orbitbox end}}

== 参见 ==
* [[确定存在的太阳系外行星列表]]

== 参考资料 ==
{{reflist|30em|refs=

<ref name=aaa474_2_653>{{citation | last1=van Leeuwen | first1=F. | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |date=November 2007}}</ref>

<ref name=aaa535_A42>{{citation | display-authors=1 | last1=Trevisan | first1=M. | last2=Barbuy | first2=B. | last3=Eriksson | first3=K. | last4=Gustafsson | first4=B. | last5=Grenon | first5=M. | last6=Pompéia | first6=L. | title=Analysis of old very metal rich stars in the solar neighbourhood | journal=Astronomy & Astrophysics | volume=535 | page=A42 | doi=10.1051/0004-6361/201016056 | bibcode=2011A&A...535A..42T |date=November 2011}}. See table 13.</ref>

<ref name=aaa487_1_373>{{citation | display-authors=1 | last1=Sousa | first1=S. G. | last2=Santos | first2=N. C. | last3=Mayor | first3=M. | last4=Udry | first4=S. | last5=Casagrande | first5=L. | last6=Israelian | first6=G. | last7=Pepe | first7=F. | last8=Queloz | first8=D. | last9=Monteiro | first9=M. J. P. F. G. | title=Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes | journal=Astronomy and Astrophysics | volume=487 | issue=1 | pages=373–381 | doi=10.1051/0004-6361:200809698 | bibcode=2008A&A...487..373S | arxiv=0805.4826 |date=August 2008}}</ref>

<ref name=houk1979>{{citation | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=1 | last1=Houk | first1=Nancy | publication-place=Ann Arbor, Michigan | publisher=Dept. of Astronomy, University of Michigan | year=1979 | bibcode=1978mcts.book.....H }}</ref>

<ref name=SIMBAD>{{citation | title=LTT 1953 -- 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+27894 | accessdate=2012-02-05 | archive-date=2020-09-18 | archive-url=https://web.archive.org/web/20200918084632/http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+27894 | dead-url=no }}</ref>

}}

== 外部链接 ==
* {{cite web | url=http://www.extrasolar.net/planettour.asp?StarCatId=normal&StarId=243 | title=HD 27894 | work=Extrasolar Visions | deadurl=yes | archiveurl=https://web.archive.org/web/20110605093433/http://www.extrasolar.net/planettour.asp?StarCatId=normal&StarId=243 | archivedate=2011-06-05 | accessdate=2012-03-29 }}
{{Sky|04|20|47.0473|-|59|24|39.014|138.1}}

[[Category:K型主序星]]
[[Category:HD和HDE天体|027894]]
[[Category:HIP天体|020277]]
[[Category:网罟座]]
[[Category:行星系]]

HD 27894 - 版本历史

imported>Jimmy-bot：​机器人: 尚未清空的已重定向分类（Cat:橙矮星→Cat:K型主序星）

imported>Jimmy-bot：机器人: 尚未清空的已重定向分类（Cat:橙矮星→Cat:K型主序星）