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2M1207 - 版本历史
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<p><b>新页面</b></p><div>{{Starbox begin<br />
| name = 2M1207<br />
}}<br />
{{Starbox image<br />
| image = [[Image:2M1207b - First image of an exoplanet.jpg|250px]]<br />
| caption = [[甚大望遠鏡]]拍攝的2M1207（蓝色）紅外影像，明顯可見其行星[[2M1207b]]（红色）。照片拍摄于2004年。<br />
}}<br />
{{Starbox observe<br />
| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]])<br />
| constell = [[半人馬座]]<br />
| ra = {{RA|12|07|33.47}}<ref name=sb /><br />
| dec = {{DEC|−39|32|54.0}}<ref name=sb /><br />
| appmag_v = 20.15<ref name=dc08>An accurate distance to 2M1207Ab, C. Ducourant, R. Teixeira, G. Chauvin, G. Daigne, J.-F. Le Campion, Inseok Song, and B. Zuckerman, ''Astronomy and Astrophysics'' '''477''', #1 (January 2008), pp. L1–L4. {{bibcode|2008A&A...477L...1D}} {{doi|10.1051/0004-6361:20078886}}.</ref><br />
}}<br />
{{Starbox character<br />
| v-r = 2.1<ref name=dc08 /><br />
| r-i = 2.1<ref name=dc08 /><br />
| class = M8<ref name=sb /><br />
}}<br />
{{Starbox astrometry<br />
| parallax = 19.1<br />
| p_error = 0.4<br />
| parallax_footnote = <ref name=dc08 /><br />
| dist_ly = 172 ± 3<br />
| dist_pc = 52.75 ± 1.0<ref name=mamajek /><br />
}}<br />
{{Starbox detail<br />
| mass = ~0.025<ref name=mamajek /><br />
| temperature = 2550 ± 150<ref name=mohanty>The Planetary Mass Companion 2MASS 1207-3932B: Temperature, Mass, and Evidence for an Edge-on Disk, Subhanjoy Mohanty, Ray Jayawardhana, Nuria Huelamo, and Eric Mamajek, ''Astrophysical Journal'' '''657''', #2 (March 2007), pp. 1064–1091. {{bibcode|2007ApJ...657.1064M}} {{doi|10.1086/510877}}.</ref><br />
| age = 5·10<sup>6</sup> to 10·10<sup>6</sup><ref name=mohanty /><br />
| radius = ~0.25<ref name=mohanty /><br />
| luminosity = ~0.002<ref name=mohanty /><br />
}}<br />
{{Starbox catalog<br />
| names = 2MASSW J1207334−393254<ref name=sb>{{SIMBAD link|NAME+2M1207A|NAME 2M1207A}}, entry, [[SIMBAD]]. Accessed on line June 15, 2008.</ref><br />
}}<br />
{{Starbox reference<br />
| Simbad = NAME+2M1207A<br />
}}<br />
{{Starbox end}}<br />
<br />
'''2M1207'''，是一顆位於[[半人馬座]]的[[棕矮星]]。該棕矮星被拍攝得有一顆伴星繞其公轉，它被編為[[2M1207b]]，極有可能是人們首顆拍得的[[太陽系外行星]]，同時也會是首顆圍繞棕矮星公轉的行星。<br />
<br />
根據J2000.0[[天球座標系統]]的數據，該恆星位於[[赤經]]12h7m33.4s，[[赤緯]]-39°32′54″，透過[[2微米全天巡天|2MASS]]的[[紅外線]]全天偵測而被發現，因此以“2M”及赤經位置來命名。它距離地球約70[[秒差距]]（PC），其[[恒星光谱分类|光譜類型]]為M8。如果它的行星仍然年輕，估計它的質量為[[木星]]的25倍。<br />
<br />
2005年12月，美國天文學家Eric Mamajek發表更準確的數據，指2M1207距離地球約53PC（173[[光年]]）<ref name="mamajek">[http://www.cfa.harvard.edu/~emamajek/memo_2m1207.html "The Distance to the 2M1207 System"] {{Wayback|url=http://www.cfa.harvard.edu/~emamajek/memo_2m1207.html |date=20080124115127 }}, Eric Mamajek, November 8, 2007. Accessed on line June 15, 2008.</ref>。如果新的數字正確，將使恆星的光度需要修正為比原先的暗，其行星的質量也修改為[[木星]]的21倍。<br />
<br />
== 参阅 ==<br />
* [[太陽系外行星]]<br />
<br />
== 参考资料 ==<br />
{{reflist}}<br />
<br />
== 外部链接 ==<br />
* {{En}}[http://space.com/scienceastronomy/aas_exoplanet_050110.html Space.com - Astronomers Confident: Planet Beyond Solar System Has Been Photographed]{{Wayback|url=http://space.com/scienceastronomy/aas_exoplanet_050110.html |date=20101125093755 }}<br />
* {{En}}[http://www.space.com/scienceastronomy/planet_photo_040910.html Space.com article on the discovery]{{Wayback|url=http://www.space.com/scienceastronomy/planet_photo_040910.html |date=20101227092434 }}<br />
* {{En}}{{cite web |url=http://exoplanet.eu/star.php?st=2M1207 |title=Notes for star 2M1207 |author=Jean Schneider |year=2011 |work= |publisher=[[Extrasolar Planets Encyclopaedia]] |accessdate=3 October 2011 |deadurl=yes |archiveurl=https://web.archive.org/web/20111006004013/http://exoplanet.eu/star.php?st=2M1207 |archivedate=2011年10月6日 }}<br />
* {{En}}[https://web.archive.org/web/20041013153848/http://www.sc.eso.org/~gchauvin/Gg222.pdf "A Giant Planet Candidate Near a Young Brown Dwarf" (PDF)] from the [[European Southern Observatory]].<br />
* {{En}}[http://arxiv.org/abs/astro-ph/0507416 "A Moving Cluster Distance to the Exoplanet 2M1207b in the TW Hydrae Association"]{{Wayback|url=http://arxiv.org/abs/astro-ph/0507416 |date=20151106182607 }}<br />
<br />
{{Sky|12|07|33.47|-|39|32|54.0|172}}<br />
{{半人马座恒星}}<br />
<br />
[[Category:半人马座]]<br />
[[Category:棕矮星]]</div>
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