imported>Cewbot：清理跨語言連結宇宙動物園成為內部連結:編輯摘要的紅色連結經繁簡轉換後存在，非bot錯誤編輯 (本次機械人作業已完成24.4%)

2026-02-15T11:35:54Z

清理跨語言連結宇宙動物園成為內部連結:編輯摘要的紅色連結經繁簡轉換後存在，非bot錯誤編輯 (本次機械人作業已完成24.4%)

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{{Planetbox begin
| name = K2-138b
}}
{{Planetbox star
| star = [[K2-138]]
| constell = [[寶瓶座]]
| RA = {{RA|23|15|47.77}}<ref name=Christiansen/>
| DEC = {{DEC|-10|50|58.91}}<ref name=Christiansen/>
| app_mag = 12.21<ref name=Christiansen/>
| dist_ly = 597 ± 55<ref name=Christiansen/>
| dist_pc = 183 ± 17<ref name=Christiansen/>
| class = K1 V<ref name=Christiansen/>
| mass = 0.93 ± 0.06<ref name=Christiansen/>
| radius = 0.86 ± 0.08<ref name=Christiansen/>
| temperature = 5378 ± 60<ref name=Christiansen/>
| metallicity = +0.16 ± 0.04<ref name=Christiansen/>
| age =
}}
{{Planetbox orbit
| epoch = BJD 2457773.3170<ref name=Christiansen/>
| semimajor = 0.03380<ref name=Christiansen/>
| period = 2.35322<ref name=Christiansen/>
| eccentricity = <0.403<ref name=Christiansen/>
| inclination = 86.9<ref name=Christiansen/>
| arg_peri =
}}
{{Planetbox character
| radius_earth = 1.57<ref name=Christiansen/>
| stellar_flux = 486<ref name=Christiansen/>
}}
{{Planetbox discovery
| discovery_date = 2018年1月11日
| discoverers = {{link-en|傑西·克里斯蒂安森|Jessie Christiansen}}等<ref name=Christiansen/>
| discovery_site = [[克卜勒太空望遠鏡]]
| discovery_method = [[系外行星偵測法#凌日法|凌日法]]
| discovery_status = 確認
}}
{{Planetbox end}}
'''K2-138b'''是一顆可能為[[超級地球]]的[[太陽系外行星]]，母恆星是光譜型K1V的恆星，軌道週期2日。該行星和同一個行星系統的其他4顆行星被[[宇宙動物園]]所屬系外行星搜尋計畫的公民科學家發現。它是該行星系統中最後發現的行星，並於2018年1月8日公布。

K2-138b是[[K2-138]]所屬行星中體積最小的行星，半徑為1.57[[地球半徑|{{Earth_radius}}]]，代表它可能是岩石質行星。K2-138b的軌道週期為2.35日，軌道半長軸0.0338天文單位。這代表K2-138b表面溫度可能極高，並且表面來自母恆星的輻射通量為地球的486倍<ref name=Christiansen>{{Cite journal|title=The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists|journal=The Astronomical Journal|volume=155|issue=2|pages=57|first1=Jessie L.|last1=Christiansen|first2=Ian J. M.|last2=Crossfield|first3=Geert|last3=Barentsen|first4=Chris J.|last4=Lintott|first5=Thomas|last5=Barclay|first6=Brooke D.|last6=Simmons|first7=Erik|last7=Petigura|first8=Joshua E.|last8=Schlieder|first9=Courtney D.|last9=Dressing|first10=Andrew|last10=Vanderburg|first11=Campbel|last11=Allen|first12=Adam|last12=McMaster|first13=Grant|last13=Miller|first14=Martin|last14=Veldthuis|first15=Sarah|last15=Allen|first16=Zach|last16=Wolfenbarger|first17=Brian|last17=Cox|first18=Julia|last18=Zemiro|first19=Andrew W.|last19=Howard|first20=John|last20=Livingston|first21=Evan|last21=Sinukoff|first22=Timothy|last22=Catron|first23=Andrew|last23=Grey|first24=Joshua J. E.|last24=Kusch|first25=Ivan|last25=Terentev|first26=Martin|last26=Vales|first27=Martti H.|last27=Kristiansen|date=11 January 2018|publisher=|arxiv=1801.03874|doi=10.3847/1538-3881/aa9be0|bibcode=2018AJ....155...57C}}</ref><ref>{{cite web|url=https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=K2-138+b&type=CONFIRMED_PLANET|title=K2-138 b|website=exoplanetarchive.ipac.caltech.edu|accessdate=2018-04-09|archive-date=2018-01-19|archive-url=https://web.archive.org/web/20180119120121/https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=K2-138+b&type=CONFIRMED_PLANET|dead-url=no}}</ref>。

K2-138行星系統是第一個所屬行星全部由公民科學家發現的特殊例子<ref>{{cite web|url=https://www.space.com/39375-citizen-scientists-discover-five-planet-system.html|title=Five-Exoplanet System Discovered Thanks to Citizen Scientists|publisher=|accessdate=2018-04-09|archive-date=2020-12-01|archive-url=https://web.archive.org/web/20201201222757/https://www.space.com/39375-citizen-scientists-discover-five-planet-system.html|dead-url=no}}</ref><ref>{{cite web|url=http://m.caltech.edu/news/citizen-scientists-discover-five-planet-system-80989|title=Citizen Scientists Discover Five-Planet System - Caltech|publisher=|accessdate=2018-04-09|archive-date=2018-09-09|archive-url=https://web.archive.org/web/20180909031003/http://m.caltech.edu/news/citizen-scientists-discover-five-planet-system-80989|dead-url=no}}</ref><ref>{{cite web|url=https://www.smithsonianmag.com/smart-news/citizen-science-uncovers-unusual-resonant-five-planet-system-180967834/|title=Citizen Scientists Discover an Unusual Five-Planet Solar System|first=Jason|last=Daley|publisher=|accessdate=2018-04-09|archive-date=2020-11-09|archive-url=https://web.archive.org/web/20201109033050/https://www.smithsonianmag.com/smart-news/citizen-science-uncovers-unusual-resonant-five-planet-system-180967834/|dead-url=no}}</ref>。

== 參見 ==
*{{link-en|2017年發現的太陽系外行星列表|List of exoplanets discovered in 2017}}

== 參考資料 ==
{{reflist}}

[[Category:凌星现象]]
[[Category:2017年发现的系外行星]]
[[Category:克卜勒太空望遠鏡發現的系外行星]]

K2-138b - 版本历史

imported>Cewbot：​清理跨語言連結宇宙動物園成為內部連結:編輯摘要的紅色連結經繁簡轉換後存在，非bot錯誤編輯 (本次機械人作業已完成24.4%)

imported>Cewbot：清理跨語言連結宇宙動物園成為內部連結:編輯摘要的紅色連結經繁簡轉換後存在，非bot錯誤編輯 (本次機械人作業已完成24.4%)