编辑“︁KIC 9832227”︁

{{Starbox begin
 |name= KIC 9832227
}}
{{Starbox image
 |image=[[File:KIC9832227.png|250px]]
 |caption= KIC 9832227（紅圈）
}}
{{Starbox observe 
 | epoch= [[曆元#儒略年和J2000|J2000]]
 | ra= {{RA|19|29|15.950}}<ref name=dr3/>
 | dec= {{DEC|+46|37|19.86}}<ref name=dr3/>
 | appmag_v=12.27 – 12.46<ref name="AAVSO" />
 | constell=[[天鵝座]] 
}}
{{Starbox character
 | class=K2III/IV<ref name=frasca2016/>
 | variable=[[食雙星]]<ref name="Kinemuchi, Karen" />
}}
{{Starbox astrometry
 | radial_v=
 | prop_mo_ra=−9.505<ref name=dr3/>
 | prop_mo_dec=−5.718<ref name=dr3/>
 | parallax=1.5798
 | p_error=0.0134
 | parallax_footnote=<ref name=dr3/>
 | absmag_v=
}}
{{Starbox orbit
|reference=<ref name=Molnar2/>
|period_unitless=0.4282579 日
|axis_unitless={{solar radius|2.992}}
|inclination=53.2
|periastron=2455688.49913
}}
{{Starbox detail
|source=<ref name=Molnar2>{{cite journal|title=A prediction of a luminous red nova eruption|author1=Molnar, Lawrence A.|author2=Van Noord, Daniel M.|author3=Steenwyk, Steven D.|author4=Spedden, Chris J.|author5=Kinemuchi, Karen|journal=American Astronomical Society|volume=225|pages=415.05|number=225|date=2015|bibcode=2015AAS...22541505M|url=http://www.calvin.edu/academic/phys/observatory/MergingStar/MolnarEtAl2017.pdf|archive-url=https://web.archive.org/web/20170107165101/https://www.calvin.edu/academic/phys/observatory/MergingStar/MolnarEtAl2017.pdf|archive-date=7 January 2017}}</ref>
|component1=A
|mass=1.395
|luminosity=2.609
|radius=1.581
|temperature=5800
|rotational_velocity=149.7
|gravity=4.19
|component2=B
|mass2=0.318
|luminosity2=0.789
|radius2=0.830
|temperature2=5920
|rotational_velocity2=84.7
|gravity2=4.10
}}
{{Starbox catalog 
 | names= [[2MASS]]&nbsp;J19291594+4637198、[[克卜勒輸入目錄|KIC]]&nbsp;9832227、[[全天空自動巡天|ASAS]]&nbsp;J192916+4637.3、[[導引星表|GSC]]&nbsp;03543-01211
}}
{{Starbox reference 
 | Simbad= KIC+9832227
 | KIC= 9832227
}}
{{Starbox end}}

'''KIC 9832227'''是在[[天鵝座]]的一個[[密接聯星]]系，距離大約2,060[[光年]]。 它也被確定為一顆[[食雙星]]，其[[軌道週期]]接近11小時<ref name="Kinemuchi, Karen" />。

== 2022年合併預測不正確 ==
[[File:KIC9832227LightCurve.png|thumb|left|根據「[[凌日系外行星巡天衛星|TESS]]」數據繪製的KIC 9832227光變曲線<ref name=MAST/>。]]

在2017年，該系統被預測將在2022.2年（±0.6年）導致一次[[恆星碰撞|合併]]，產生一顆[[亮紅新星]]（LRN），其[[視星等]]達到2<ref name=molnar/>，或相當於[[北極星]]的亮度。LRN將在大約一個月內保持肉眼可見。依據預測，兩顆恆星核心的合併將產生一顆新的、更熱的、質量更大的[[主序星]]。然而，2018年9月對數據的重新分析表明，這一預測是基於錯誤的觀測時間，否定了預測的合併<ref name=Molnar2018/><ref name=Socia2018/><ref name=Parks2018/>。

根據觀察，自2013年以來，KIC 9832227的變化期越來越短，因此預測合併將在2022年左右發生<ref>{{cite web|last1=Carlisle|first1=Camille|title=Paired Stars in Cygnus En Route to Merger|url=http://www.skyandtelescope.com/uncategorized/stars-en-route-to-merger/|publisher=[[Sky and Telescope]]|access-date=12 January 2017|date=6 January 2017|archive-date=2017-01-07|archive-url=https://web.archive.org/web/20170107173419/http://www.skyandtelescope.com/uncategorized/stars-en-route-to-merger/|dead-url=no}}</ref>。2018年9月，有消息稱，最初的預測是基於一個數据集，該數据集的時間被錯誤地偏移了12小時，這一錯誤似乎誇大了軌道週期的衰减率。對錯誤的糾正表明，直到2008年左右，這一週期實際上一直在增加。週期變化的原因尚不清楚，但已確定系統不會在預測的時間合併<ref name=Molnar2018/><ref name=Socia2018/><ref name=Socia2018b/>。

== 相關條目 ==
* [[亮紅新星]]
* [[恆星碰撞]]

== 參考資料 ==
{{Reflist|25em|refs=

<ref name=dr3>{{cite Gaia DR3|2128318232616057856}}</ref>

<ref name=Parks2018>{{cite web|url=https://www.astronomy.com/news/2018/09/two-stars-will-not-merge-and-explode-into-red-fury-in-2022|title=Two stars will NOT merge and explode into red fury in 2022|first=Jake|last=Parks|date=7 September 2018|website=astronomy.com|access-date=2024-10-25|archive-date=2023-04-05|archive-url=https://web.archive.org/web/20230405214054/https://astronomy.com/news/2018/09/two-stars-will-not-merge-and-explode-into-red-fury-in-2022|dead-url=no}}</ref>

<ref name=Molnar2018>{{cite web|last1=Molnar|first1=Lawrence A.|url=http://www.calvin.edu/academic/phys/observatory/MergingStar/2018Update.html|title=Supplementary material to Calvin College press release "Team of researchers challenge bold astronomical prediction", September 7, 2018|website=calvin.edu|date=7 September 2018|access-date=8 September 2018|archive-date=16 December 2018|archive-url=https://web.archive.org/web/20181216000942/http://www.calvin.edu/academic/phys/observatory/MergingStar/2018Update.html|url-status=dead}}</ref>

<ref name=frasca2016>{{cite journal |bibcode=2016A&A...594A..39F |title=Activity indicators and stellar parameters of the Kepler targets. An application of the ROTFIT pipeline to LAMOST-Kepler stellar spectra |last1=Frasca |first1=A. |last2=Molenda-Żakowicz |first2=J. |last3=De Cat |first3=P. |last4=Catanzaro |first4=G. |last5=Fu |first5=J. N. |last6=Ren |first6=A. B. |last7=Luo |first7=A. L. |last8=Shi |first8=J. R. |last9=Wu |first9=Y. |last10=Zhang |first10=H. T. |journal=Astronomy and Astrophysics |date=2016 |volume=594 |doi=10.1051/0004-6361/201628337 |arxiv=1606.09149 |s2cid=119283349 }}</ref>

<ref name=Socia2018>{{cite web|url=https://calvin.edu/news/archive/team-of-researchers-challenge-bold-astronomical-prediction|title=Team of researchers challenge bold astronomical prediction|first=Matt|last=Kucinski|website=calvin.edu|date=7 September 2018|access-date=8 September 2018|archive-date=2021-01-24|archive-url=https://web.archive.org/web/20210124163726/https://calvin.edu/news/archive/team-of-researchers-challenge-bold-astronomical-prediction|dead-url=no}}</ref>

<ref name=Socia2018b>{{cite journal|title=KIC 9832227: Using Vulcan Data to Negate the 2022 Red Nova Merger Prediction|first1=Quentin J.|last1=Socia|first2=William F.|last2=Welsh|first3=Donald R.|last3=Short|first4=Jerome A.|last4=Orosz|first5=Ronald J.|last5=Angione|first6=Gur|last6=Windmiller|first7=Douglas A.|last7=Caldwell|first8=Natalie M.|last8=Batalha|journal=Astrophysical Journal Letters|date=11 September 2018|volume=864|issue=2|pages=L32|doi=10.3847/2041-8213/aadc0d|arxiv=1809.02771|bibcode=2018ApJ...864L..32S|s2cid=56134618 |doi-access=free }}</ref>

<ref name="AAVSO">{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=169823|title=ASAS J192916+4637.3|publisher=[[American Association of Variable Star Observers|AAVSO]]|access-date=7 January 2017|archive-date=2018-07-09|archive-url=https://web.archive.org/web/20180709153851/http://www.aavso.org/vsx/index.php?view=detail.top&oid=169823|dead-url=no}}</ref>

<ref name = "Kinemuchi, Karen">{{Cite arXiv|last=Kinemuchi|first=Karen|date=2013-10-01|title=To Pulsate or to Eclipse? Status of KIC 9832227 Variable Star |class=astro-ph.SR|eprint=1310.0544 }}</ref>

<ref name=MAST>{{cite web |title=MAST: Barbara A. Mikulski Archive for Space Telescopes |url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html |publisher=Space Telescope Science Institute |access-date=8 December 2021 |archive-date=2012-06-27 |archive-url=https://web.archive.org/web/20120627042936/https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html |dead-url=no }}</ref>

<ref name=molnar>{{cite journal|bibcode=2017AAS...22941704M|title=KIC 9832227: A red nova precursor|journal=American Astronomical Society|volume=229|pages=417.04|last1=Molnar|first1=Lawrence A.|last2=Van Noord|first2=Daniel|last3=Kinemuchi|first3=Karen|last4=Smolinski|first4=Jason P.|last5=Alexander|first5=Cara E.|last6=Kobulnicky|first6=Henry A.|last7=Cook|first7=Evan M.|last8=Jang|first8=Byoungchan|last9=Steenwyk|first9=Steven D.|year=2017}}</ref>

}}

== 外部連結 ==
*{{cite web|last1=Molnar|first1=Lawrence|display-authors=etal|title=Prediction of a Red Nova Outburst in KIC 9832227|url=http://www.calvin.edu/academic/phys/observatory/MergingStar/MolnarEtAl2017.pdf|website=Calvin College|publisher=Calvin College Group|edition=draft|date=4 January 2017|access-date=8 January 2017|url-status=dead|archive-url=https://web.archive.org/web/20170107165101/http://www.calvin.edu/academic/phys/observatory/MergingStar/MolnarEtAl2017.pdf|archive-date=7 January 2017}}
*{{cite news|last1=Knapton|first1=Sarah|title=Spectacular collision of suns will create new star in night sky in 2022|url=https://www.telegraph.co.uk/science/2017/01/06/spectacular-collision-suns-will-create-new-star-night-sky-2022/|newspaper=The Telegraph|date=6 January 2017|access-date=7 January 2017|archive-date=2021-02-01|archive-url=https://web.archive.org/web/20210201203853/https://www.telegraph.co.uk/science/2017/01/06/spectacular-collision-suns-will-create-new-star-night-sky-2022/|dead-url=no}}
*{{cite web|last1=Byrd|first1=Deborah|title=Star predicted to explode in 2022|url=https://earthsky.org/space/star-predicted-to-explode-in-2022|website=EarthSky|date=6 January 2017|publisher=EarthSky Communications|access-date=7 January 2017|archive-date=2020-12-02|archive-url=https://web.archive.org/web/20201202053847/https://earthsky.org/space/star-predicted-to-explode-in-2022|dead-url=no}}
*{{cite web|last1=Masi|first1=Gianluca|title=Star merging in KIC 9832227: a possible once-in-a-lifetime event|url=https://www.virtualtelescope.eu/2017/01/11/star-merging-in-kic-9832227-a-possible-once-in-a-lifetime-event/|website=Virtual Telescope Project|date=11 January 2017|access-date=11 January 2017|archive-date=2020-12-29|archive-url=https://web.archive.org/web/20201229184000/https://www.virtualtelescope.eu/2017/01/11/star-merging-in-kic-9832227-a-possible-once-in-a-lifetime-event/|dead-url=no}}

{{天鵝座恆星}}
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[[Category:天鵝座]]
[[Category:大熊座W型變星]]
[[Category:2MASS天體|J19291594+4637198]]
[[Category:克卜勒輸入星表]]