编辑“︁LP 944-20”︁

{{Sky|03|39|35.22|-|35|25|44.09|20.961}}
{{Starbox begin
| name = LP 944-20
}}
{{Starbox observe
| epoch = [[J2000]]
| equinox = [[J2000]]
| constell = [[天爐座]]
| ra={{RA|03|39|35.220}}<ref name="SIMBAD">{{cite web
 | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=LP+944-20
 | title=SIPS J0339-3525 -- Brown Dwarf (M<0.08solMass)
 | publisher=[[Centre de Données astronomiques de Strasbourg]]
 | accessdate=2009-12-14
 | archive-date=2021-08-31
 | archive-url=https://web.archive.org/web/20210831192948/https://simbad.u-strasbg.fr/simbad/sim-id?Ident=LP+944-20
 | dead-url=no
 }}</ref>
| dec={{DEC|–35|25|44.09}}<ref name="SIMBAD" />
| appmag_v = 18.69
}}
{{Starbox character
| class = M9<ref name="SIMBAD" />
| appmag_1_passband = B
| appmag_1 = ~20.17<ref name="SIMBAD" />
| appmag_2_passband = I
| appmag_2 = ~13.288<ref name="SIMBAD" />
| appmag_3_passband = J
| appmag_3 = {{val|10.725|0.021}}<ref name="SIMBAD" />
| appmag_4_passband = H
| appmag_4 = {{val|10.017|0.021}}<ref name="SIMBAD" />
| appmag_5_passband = K
| appmag_5 = {{val|9.548|0.023}}<ref name="SIMBAD" />
}}
{{Starbox astrometry
 | radial_v = 
 | prop_mo_ra = {{val|309.001|0.050}}<ref name="GaiaEDR3"/>
 | prop_mo_dec = {{val|269.058|0.064}}<ref name="GaiaEDR3"/>
 | parallax = 155.5982
 | p_error = 0.0522
 | parallax_footnote = <ref name="GaiaEDR3">{{Cite Gaia EDR3|4860376345833699840}}</ref>
 | absmag_v = 20.02
 }}
{{Starbox detail
| source = <ref name=Guenther2009/>
| mass =0.06{{±|0.04}}
| radius=
| luminosity=
| temperature=2650{{±|30}}
| metal=
| rotation= <4.5 [[小時|hrs]]
| rotational_velocity=28{{±|4}}
| gravity=
| age=320 {{±|80}} 百萬
}}
{{Starbox catalog
| names =LP 944-20, SIPS J0339−3525, LEHPM 3451, 2MASSI J0339352−352544, [B2006] J033935.2−352544, APMPM J0340−3526, 2MASS J03393521-3525440, 2MASSW J0339352−352544, BRI B0337−3535, BRI 0337−3535, 2MUCD 10201, Gaia DR2 4860376345833699840
}}
{{Starbox reference
| Simbad = LP+944-20
}}
{{Starbox image
|image={{Location map|100x100|AlternativeMap=Fornax_constellation_map.svg
|alt=LP 944-20 is located in the constellation Fornax
|caption=LP 944-20在天爐座的位置|border=infobox|mark=Red_pog.png|width=320
|label=LP 944-20
|lat=32.5
|long=17.6
}}|caption=
}}
{{Starbox end}}

'''LP 944-20'''是位於[[天爐座]]的一顆光譜類型為M9非常暗淡的[[棕矮星]]，距離太陽系20.9光年。[[視星等]]為18.69，[[近星研究會]]上列出的恆星中最暗淡的恆星之一。

==物理特性==
由於自轉週期短，這顆年輕的褐矮星表現出強烈而頻繁的[[X射線]]耀斑，並擁有光球層級高達135G的強磁場。<ref name=Guenther2009>{{citation |arxiv=0903.2340 |title=Short-term spectroscopic monitoring of two cool dwarfs with strong magnetic fields |year=2009 |doi=10.1051/0004-6361/200810216 |last1=Guenther |first1=E. W. |last2=Zapatero-Osorio |first2=María Rosa |last3=Mehner |first3=A. |last4=Martín |first4=Eduardo L. |journal=Astronomy & Astrophysics |volume=498 |issue=1 |pages=281–287 |bibcode=2009A&A...498..281G |s2cid=18611224 }}</ref>1999年12月15日，探測到X射線耀斑。<ref>{{cite journal |last1=Rutledge |first1=Robert E. |last2=Basri |first2=Gibor |last3=Martín |first3=Eduardo L. |last4=Bildsten |first4=Lars |title=Chandra Detection of an X-Ray Flare from the Brown Dwarf LP 944-20 |journal=The Astrophysical Journal |date=1 August 2000 |volume=538 |issue=2 |pages=L141–L144 |arxiv=astro-ph/0005559 |bibcode=2000ApJ...538L.141R |doi=10.1086/312817 |s2cid=17800872 }}</ref><ref>{{cite web|url=http://www.solstation.com/stars/lp944-20.htm|title=LP 944-20|website=Solstation.com|accessdate=2017-03-11|archive-date=2023-03-22|archive-url=https://web.archive.org/web/20230322113816/http://www.solstation.com/stars/lp944-20.htm|dead-url=no}}</ref>

2007年發表的觀測結果表明，LP 944-20的大氣層含有大量[[鋰]]，並且它有塵土飛揚的雲。<ref>{{cite journal | title=Lithium in LP944-20 |author1=Pavlenko, Ya. V. |author2=Jones, H. R. A. |author3=Martín, Eduardo L. |author4=Guenther, E. |author5=Kenworthy, M. A. |author6=Zapatero-Osorio, María Rosa |journal=[[Monthly Notices of the Royal Astronomical Society]] |volume=380 |issue=3 |pages=1285–96 |date=September 2007 |doi=10.1111/j.1365-2966.2007.12182.x |bibcode=2007MNRAS.380.1285P |arxiv=0707.0694 |s2cid=11186385 }}</ref>

==註釋==
<references group="note" />

==參考==
{{reflist}}

==外部連結==
*[http://www.astro.gsu.edu/RECONS/TOP100.posted.htm "The 100 nearest star systems"] {{Wayback|url=http://www.astro.gsu.edu/RECONS/TOP100.posted.htm |date=20071112173559 }}, ''[[近星研究會]]''

{{Nearest star systems|5}}
{{Stars of Fornax}}

[[Category:天爐座]]
[[Category:2MASS天體|J03393521-3525440]]