编辑“︁KELT-2Ab”︁

{{Planetbox begin
| name = KELT-2Ab
}}
{{Planetbox star 
| star = [[KELT-2A]] 
| constell = [[御夫座]]
| RA = {{RA|06|10|39}}
| DEC = {{DEC|+30|57|25}}
| dist_ly = 419 ± 15<ref name="discovery"/>
| dist_pc = 128.6 ± 4.7<ref name="discovery"/>
| class =  F7V
}} 
{{Planetbox orbit 
| semimajor = 0.5504 ± 0.00086
| eccentricity = 0 
| period =  4.1137913 ± 0.00001
| inclination =  88.56 ± 1.14
| ang_dist = 0.278
| arg_peri = 90
| t_peri = 2455974.60338 ± 0.00083
| semi-amp = 161.1 ± 7.8 
}}
{{Planetbox character 
| mass =   1.524 ± 0.088<ref name="discovery"/>
| radius = 1.290 ± 0.057<ref name="discovery"/>
| density = 940 ± 90<ref name="discovery"/>
| gravity = 22.7
| gravity_earth = 2.3
}} 
{{Planetbox discovery 
| discovery_date = 2012年6月7日
| discoverers = KELT巡天
| discovery_method = [[凌日法]]
| discovery_location = {{USA}}
| discovery_status = 已發表論文
}}
{{Planetbox end}}

'''KELT-2Ab'''是一顆環繞恆星[[KELT-2A]]的[[太陽系外行星]]，距離地球約419光年，位於[[御夫座]]<ref name="discovery">{{cite journal | url=http://arxiv.org/abs/1206.1592 | author=Beatty | title=KELT-2Ab: A Hot Jupiter Transiting the Bright (V=8.77) Primary Star of a Binary System | journal=The [[Astrophysical Journal]] Letters | year=2012 | access-date=2012-08-30 | archive-date=2020-08-11 | archive-url=https://web.archive.org/web/20200811144104/https://arxiv.org/abs/1206.1592 | dead-url=no }} ([http://arxiv.org/abs/1206.1592 web Preprint] {{Wayback|url=http://arxiv.org/abs/1206.1592 |date=20200811144104 }})</ref>。該行星是由{{link-en|千度極小望遠鏡巡天|Kilodegree Extremely Little Telescope}}（Kilodegree Extremely Little Telescope，KELT）以凌日法發現，因此可以精確測定它的質量和體積。KELT-2Ab發現時是凌日的熱木星中亮度第五高的，因此可以知道它的約束質量相當高。這些特性使KELT-2A系統是未來太空或地面望遠鏡進一步觀測以了解行星大氣層的良好目標。

母恆星KELT-2A是一個擁有共同自行聯星系統KELT-2（HD 42176）的其中一顆成員星。KELT-2B是一顆[[橙矮星]]，距離主星295天文單位。

== 參見 ==
* {{link-en|千度極小望遠鏡巡天|Kilodegree Extremely Little Telescope}}（Kilodegree Extremely Little Telescope，KELT）

== 參考資料 ==
{{reflist}}

== 外部連結 ==
* [http://www.astronomy.ohio-state.edu/keltnorth/ KELT-North survey website] {{Wayback|url=http://www.astronomy.ohio-state.edu/keltnorth/ |date=20190124172930 }}
* {{cite web |url=http://exoplanet.eu/catalog/kelt-2a_b/ |title=Planet KELT-2A b |accessdate=2012-07-30 |work=The Extrasolar Planets Encyclopaedia |publisher= |date= |deadurl=yes |archiveurl=https://web.archive.org/web/20121019013029/http://exoplanet.eu/catalog/kelt-2a_b/ |archivedate=2012-10-19 }}
* [http://www.youtube.com/watch?v=3MG0KA7hRqI KELT-2Ab discovery lightcurve, with music] {{Wayback|url=http://www.youtube.com/watch?v=3MG0KA7hRqI |date=20160722033844 }}
{{Sky|06|10|39|+|30|57|25}}

{{2012年太空活動}}

[[Category:御夫座]]
[[Category:热木星]]
[[Category:凌星现象]]
[[Category:2012年发现的系外行星]]