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HD 69830 - 版本历史
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<p><b>新页面</b></p><div>{{Starbox begin <br />
| name = HD 69830<br />
}}<br />
{{Starbox image<br />
| image = [[File:Morgan-Keenan spectral classification zoom.png|250px|center]]<br />
| caption = HD 69830是一顆[[K-型主序星|K0V級]]的恆星，質量略小於[[太陽]](G2V)<br />
}} <br />
{{Starbox observe <br />
| epoch = J2000.0<br />
| constell = [[船尾座]]<br />
| ra = {{RA|08|18|23.9473}}<br />
| dec = {{DEC|-12|37|55.824}}<br />
| appmag_v = +5.95<br />
}} <br />
{{Starbox character <br />
| class = K0V<br />
| r-i = 0.36<br />
| v-r = 0.40<br />
| b-v = 0.753<br />
| u-b = 0.34<br />
| variable = none<br />
}} <br />
{{Starbox astrometry <br />
| radial_v = +30.4<br />
| prop_mo_ra = 279.29<br />
| prop_mo_dec = −988.99<br />
| parallax = 80.32<br />
| parallax_footnote = <ref>{{cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=40567|title=HIP 40693|work=Hipparcos, the New Reduction|author=van Leeuwen, F.|year=2007|accessdate=2008-08-17|archive-date=2019-03-28|archive-url=https://web.archive.org/web/20190328164651/https://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html|dead-url=no}}</ref><br />
| p_error = 0.35<br />
| absmag_v = 5.85<br />
}}<br />
{{Starbox detail <br />
| age = {{nowrap|(5.1–6.1) × 10<sup>9</sup>}}<ref name="apj687">{{cite journal<br />
| author=Mamajek, Eric E.; Hillenbrand, Lynne A.<br />
| title=Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics<br />
| url=https://archive.org/details/sim_astrophysical-journal_2008-11-10_687_2/page/1264<br />
| journal=The Astrophysical Journal | volume=687 | issue=2<br />
| pages=1264–1293 | doi=10.1086/591785 | bibcode=2008ApJ...687.1264M |date=November 2008}}</ref><br />
| metal = 89 ± 4 %<br />
| mass = 0.86 ± 0.03<br />
| radius = 0.89<br />
| gravity = 4.47<br />
| rotation = 21.5 days<br />
| luminosity = 0.60 ± 0.03<br />
| temperature = 5385 ± 20<br />
}} <br />
{{Starbox catalog <br />
| names = HR 3259, Gliese 302, [[Hipparcos|HIP]] 40693, SAO 154093, LHS 245, BD −12°2449 <br />
}} <br />
{{Starbox reference<br />
| Simbad = HD+69830<br />
| NSTED = HD+69830<br />
| ARICNS = 00624<br />
| EPE = HD+69830<br />
}}<br />
{{Starbox end}}<br />
<br />
'''HD 69830'''是一顆位於[[船尾座]]，距離大約41[[光年]]的[[橘色矮星|橘色]][[恆星]]。在2005年，[[史匹哲太空望遠鏡]]發現一圈[[小行星帶]]環繞著這顆恆星<ref>{{cite journal|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2005ApJ...626.1061B&db_key=AST&nosetcookie=1|author=Beichman, C.A. et al.|title=An Excess Due to Small Grains around the Nearby K0 V Star HD 69830: Asteroid or Cometary Debris?|journal=[[The Astrophysical Journal]]|volume=626|issue=2|pages=1061–1069|year=2005|doi=10.1086/430059}}</ref>。這個小行星帶比太陽系的小行星帶大了許多，並且更為活躍。而在2006年，確認有三顆[[海王星]]質量的[[系外行星]]環繞著這顆恆星，並且它們的活動像小行星帶的牧者一樣<ref name="Lovis">{{cite journal | url=http://www.nature.com/nature/journal/v441/n7091/abs/nature04828.html | author=Lovis, C. ''et al.'' | title=An extrasolar planetary system with three Neptune-mass planets | journal=[[Nature (journal)|Nature]] | volume=441 | issue=7091 | pages=305–309 | year=2006 | doi=10.1038/nature04828 | format=abstract | id={{arXiv|astro-ph/0703024}} | pmid=16710412 | access-date=2010-07-17 | archive-date=2017-04-22 | archive-url=https://web.archive.org/web/20170422161311/http://www.nature.com/nature/journal/v441/n7091/abs/nature04828.html | dead-url=no }}</ref>。 <br />
<br />
==距離和可見性 ==<br />
<br />
HD 69830是一顆[[光譜類型]]為K0V的[[橙矮星|橙色]][[恆星]]，質量大約是[[太陽]]的86%，半徑是89%，[[亮度]]大約是45%。鐵的含量大約在太陽的89至93%之間，目前的年齡估計大約是70億歲。HD 69830與[[太陽]]的距離大約是41[[光年]]，位於[[船帆座]]的東北部份。可以在[[天狼星]]的東方、[[南河三]]的西南方、[[大犬座δ]]的西北方、和[[船尾座ζ]]的北方找到它。<br />
<br />
== 行星系統 ==<br />
<br />
{{OrbitboxPlanet begin<br />
| table_ref = <ref name="Lovis"/><ref name="Lisse"/> }}<br />
{{OrbitboxPlanet<br />
| exoplanet = [[HD 69830 b|b]]<br />
| mass = ≥0.033<br />
| period = 8.667 ± 0.003<br />
| semimajor = 0.0785<br />
| eccentricity = 0.1 ± 0.04<br />
}}<br />
{{OrbitboxPlanet<br />
| exoplanet = [[HD 69830 c|c]]<br />
| mass = ≥0.038<br />
| period = 31.56 ± 0.04<br />
| semimajor = 0.186<br />
| eccentricity = 0.13 ± 0.06<br />
}}<br />
{{OrbitboxPlanet<br />
| exoplanet = [[HD 69830 d|d]]<br />
| mass = ≥0.058<br />
| period = 197 ± 3<br />
| semimajor = 0.63<br />
| eccentricity = 0.07 ± 0.07<br />
}}<br />
{{OrbitboxPlanet disk<br />
| disk = [[岩屑盤]]<br />
| periapsis = 0.93<br />
| apoapsis = 1.16<br />
}}<br />
{{Orbitbox end}}<br />
<br />
=== 小行星帶 ===<br />
<br />
[[Image:HD 69830 Asteroid Belt.jpg|thumb|left|[[地球]]的夜空和HD 69830夜空的比較。.]]<br />
<br />
在2005年，[[史匹哲太空望遠鏡]]檢測到HD 69830的系統中存在著由大量塵埃物質構成的小行星帶，質量比太陽系的大了20倍。這個小行星帶的軌道起初被認為是在相當於太陽系[[金星]]所在的位置，位於第二顆和第三顆行星之間。這個帶狀是如此的巨大，因此附近行星的夜晚將會被比地球的[[黃道光]]亮1000倍的光輝照亮，並且輕易的掩蓋過[[銀河系|銀河]]。<br />
<br />
進一步的分析這個帶的光譜顯示它由高度加工作的物質組成，類似於分裂成直徑約30公里的[[P-型小行星|P型]]或[[D-型小行星|D型]]小行星，還包含許多不能存在於如此近距離的小冰粒。換言之，它似乎應該在更外面的位置，大約是地球軌道，距離這顆恆星一天文單位的更外層。這個區域是與HD 69830d有著2:1和5:2軌道共振的區域內<ref name="Lisse"> {{cite journal | url=http://www.iop.org/EJ/article/0004-637X/658/1/584/65847.html | author=Lisse, C.M. ''et al.'' | title=On the Nature of the Dust in the Debris Disk Around HD 69830 | journal=The [[Astrophysical Journal]] | volume=658 | issue=1 | pages=584–592 | year=2007 | doi=10.1086/511001}}</ref>。 <br />
<br />
=== 行星 ===<br />
[[Image:Artwork showing a blurred globe and other celestial bodies, inspired by the asteroid belt of HD 69830.jpg|thumb|right|從2005年的藝術家想像的小行星帶和假設在外側的行星。]]<br />
<br />
在2006年5月17日，一組天文學家使用位於[[智利]][[阿塔卡马沙漠]]的[[歐洲南方天文台]](ESO)安裝在3.6公尺[[拉西亚天文台|拉西亚]]望遠鏡上的[[HARPS]][[光譜儀]]，宣稱發現三顆環繞這顆恆星的[[系外行星]]。它們的質量都在[[地球]]的10至18倍之間，這三顆行星都被假設與[[海王星]]或[[天王星]]類似。截至2005年，在距離HD 69830三個天文單位的距離內沒有發現質量超過木星一半的行星。<br />
<br />
被發現的行星中位於最外側的似乎在這顆恆星的[[適居帶]]範圍內，液態水將能保持穩定(需要更精確的資料才能正確的知道適居帶的區域在何處)。HD 69830是第一顆系外行星系統中沒有任何質量相當於[[木星]]或[[土星]]環繞的類太陽恆星。<br />
<br />
==與大眾文化的關係 ==<br />
在[[最後一戰3]]的限量版中包含的Bestiarum中，描述HD 69830 d是[[星盟 (最後一戰)#Jackals|Jackals]]所來自的星球，具體說明它們是來自小行星帶內部邊緣第三顆行星的一顆假設的衛星。<br />
<br />
== 相關條目 ==<br />
{{commonscat}}<br />
* [[HD 169830]]<br />
* [[HD 40307]]<br />
* [[HD 60532]]<br />
* [[確定存在的太陽系外行星列表]]<br />
<br />
== 參考資料 ==<br />
<br />
{{reflist}}<br />
<br />
== 外部連結 ==<br />
<br />
* {{cite web |url=http://www.spitzer.caltech.edu/Media/releases/ssc2005-10/release.shtml |title=NASA's Spitzer Telescope Sees Signs of Alien Asteroid Belt |accessdate=2008-06-13 |work=NASA |publisher=Spitzer Space Telescope |date=2005-04-20 |last=Clavin |first=Whitney |deadurl=yes |archiveurl=https://web.archive.org/web/20080511161456/http://www.spitzer.caltech.edu/Media/releases/ssc2005-10/release.shtml |archivedate=2008-05-11 }}<br />
* {{cite web |url=http://www.extrasolar.net/startour.asp?StarCatId=normal&StarId=252 |title=HD 69830 |accessdate=2008-06-13 |work=Extrasolar Visions |deadurl=yes |archiveurl=https://web.archive.org/web/20101006234144/http://extrasolar.net/startour.asp?StarCatID=normal&StarID=252 |archivedate=2010-10-06 }}<br />
* {{cite web |url=http://www.extrasolar.net/planettour.asp?StarCatId=normal&PlanetId=293 |title=HD 69830 asteroid belt |accessdate=2008-06-13 |work=Extrasolar Visions |deadurl=yes |archiveurl=https://web.archive.org/web/20070930014600/http://www.extrasolar.net/planettour.asp?StarCatId=normal&PlanetId=293 |archivedate=2007-09-30 }}<br />
* {{cite web |url=http://www.solstation.com/stars2/hd69830.htm |title=HD 69830 / HR 3259 |accessdate=2008-06-13 |work=SolStation |archive-date=2009-02-17 |archive-url=https://web.archive.org/web/20090217151339/http://solstation.com/stars2/hd69830.htm |dead-url=no }}<br />
* {{cite web |url=http://exoplanet.eu/star.php?st=HD+69830 |title=Notes for star HD 69830 |accessdate=2008-06-13 |work=The Extrasolar Planets Encyclopaedia |archive-date=2012-05-31 |archive-url=https://web.archive.org/web/20120531190803/http://exoplanet.eu/star.php?st=HD+69830 |dead-url=no }}<br />
* {{cite web |url=http://www.space.com/scienceastronomy/060517_netpune_planets.html |title=Planets Found in Potentially Habitable Setup |accessdate=2008-06-13 |work=SPACE.com |date=2006-05-17 |last=Than |first=Ker |archive-date=2009-06-05 |archive-url=https://web.archive.org/web/20090605225821/http://www.space.com/scienceastronomy/060517_netpune_planets.html |dead-url=no }}<br />
* {{cite web |url=http://www.spacedaily.com/reports/Trio_Of_Neptunes_And_Their_Belt.html |title=Trio Of Neptunes And Their Belt |accessdate=2008-06-13 |work=SpaceDaily |date=2006-05-18 |archive-date=2009-06-10 |archive-url=https://web.archive.org/web/20090610021608/http://www.spacedaily.com/reports/Trio_Of_Neptunes_And_Their_Belt.html |dead-url=no }}<br />
* [http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ Extrasolar Planet Interactions]{{Wayback|url=http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ |date=20160505160348 }} by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona<br />
{{clear}}<br />
{{HD 69830|state=collapsed}}<br />
{{Sky|08|18|23.9|-|12|37|55.0|41}}<br />
<br />
[[Category:星周盤]]<br />
[[Category:HD和HDE天體|069830]]<br />
[[Category:HIP天體|040693]]<br />
[[Category:HR天體|3259]]<br />
[[Category:格利泽和GJ天体|0302]]<br />
[[Category:K型主序星]]<br />
[[Category:船尾座]]<br />
[[Category:太陽系外行星]]</div>
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