编辑“︁WASP-121”︁（章节）

==行星系统==
[[File:PIA22565-Exoplanet-WASP121b-ComputerSimViews-20180809.jpg|thumb|center|400px|<center>WASP-121b - 计算机模拟视图（2018年8月）</center>]]

2015年，通过[[系外行星侦测法#凌日法]]发现了[[系外行星]][[WASP-121b]]，它的轨道环绕WASP-121。<ref name="EP-2015" /> WASP-121b 是一个[[热木星]]，也是一个[[系外行星]] 。它的质量是[[木星]]的 1.18 倍，而半径是木星的 1.81 倍。<ref name="WASP-2017" /><ref name="NASA-20170802" /> 这个行星每 1.27天环绕 WASP-121一圈。<ref name="WASP-2017" /><ref name="NASA-20170802" /> 人们在WASP-121b的[[平流层]]中发现了[[水|高温的水分子]]。<ref name="EP-2015" /><ref name="NASA-20170802">{{cite web |last1=Landau |first1=Elizabeth |last2=Villard |first2=Ray |title=Hubble Detects Exoplanet with Glowing Water Atmosphere |url=https://www.jpl.nasa.gov/news/news.php?feature=6909 |date=2 August 2017 |work=[[NASA]] |accessdate=2 August 2017 |archive-date=2019-05-10 |archive-url=https://web.archive.org/web/20190510010257/https://www.jpl.nasa.gov/news/news.php?feature=6909 |dead-url=no }}</ref><ref name="NAT-20170802">{{cite journal |author=Evans, Thomas M.|display-authors=etal |title=An ultrahot gas-giant exoplanet with a stratosphere |date=2 August 2017 |journal=[[Nature (journal)|Nature]] |volume=548 |issue=7665 |pages=58–61 |doi=10.1038/nature23266 |arxiv = 1708.01076 |bibcode = 2017Natur.548...58E |pmid=28770846}}</ref><ref>{{cite arXiv|eprint=2005.09631|last1=Mikal-Evans|first1=Thomas|last2=Sing|first2=David K.|last3=Kataria|first3=Tiffany|last4=Wakeford|first4=Hannah R.|last5=Mayne|first5=Nathan J.|last6=Lewis|first6=Nikole K.|last7=Barstow|first7=Joanna K.|last8=Spake|first8=Jessica J.|title=Confirmation of water emission in the dayside spectrum of the ultrahot Jupiter WASP-121b|year=2020|class=astro-ph.EP}}</ref>

{{OrbitboxPlanet begin}}
{{OrbitboxPlanet
| exoplanet = [[WASP-121b|b]]
| mass = 1.184<ref name="EP-2015" /><ref name="WASP-2017" />
| period = 1.275<ref name="EP-2015" />
| semimajor = 0.02544<ref name="EP-2015" />
| eccentricity = 0.0<ref name="EP-2015" />
| inclination = 87.6<ref name="EP-2015" />
| radius = 1.81<ref name="WASP-2017" />
}}
{{Orbitbox end}}