编辑“︁UGPS J072227.51-054031.2”︁

{{Starbox begin
| name = UGPS J072227.51-054031.2
}}
{{Starbox observe
| equinox = J2000.0
| epoch = [[J2000.0]]
| constell = [[麒麟座]]
| ra = {{RA|07|22|27.29}}{{r|Lucas2010}}
| dec = {{DEC|-05|40|30.0}}{{r|Cushing2011}}
|appmag_1_passband = [[J band|J]]<!-- Passband for second apparent magnitude (e.g., H, J, K, etc.) -->
|appmag_1 = 16.5{{r|Lucas2010}}
}}
{{Starbox character
| class = T9{{r|Cushing2011}}
| appmag_1_passband = i <small>(AB [[斯隆数字化巡天|SDSS]])</small>
| appmag_1 = 24.32 ± 0.12{{r|Leggett2012}}
| appmag_2_passband = z
| appmag_2 = 20.51 ± 0.09{{r|Lucas2010|Bochanski2011}}
| appmag_3_passband = Y
| appmag_3 = 17.37 ± 0.02{{r|Lucas2010}}
| appmag_4_passband = J
| appmag_4 = 16.52 ± 0.02{{r|Lucas2010}}
| appmag_5_passband = H
| appmag_5 = 16.90 ± 0.02{{r|Lucas2010}}
| appmag_6_passband = K
| appmag_6 = 17.07 ± 0.08{{r|Lucas2010}}
| appmag_7_passband = L'
| appmag_7 = 13.4 ± 0.3{{r|Lucas2010}}
| appmag_8_passband = N
| appmag_8 = 10.28 ± 0.24{{r|Lucas2010}}
}}
{{Starbox astrometry
| radial_v = 46.9 ± 2.5{{r|Bochanski2011}}
| prop_mo_ra = −904.14 ± 1.71{{r|Leggett2012}}
| prop_mo_dec = 352.025 ± 1.21{{r|Leggett2012}}
| parallax = 242.8
| p_error = 2.4
| parallax_footnote = {{r|Leggett2012}}
}}
{{Starbox detail
| mass_mj = (10.7 ± 0.2)—(25.8 ± 0.9){{r|Dupuy2013}}
| radius_rj = (0.886 ± 0.005)—(1.0192 ± 0.0005){{r|Dupuy2013}}
| luminosity_bolometric = (6.3 ± 0.4{{e|−7}}{{r|Dupuy2013}}
| gravity = (4.39 ± 0.01)—(4.90 ± 0.01){{r|Dupuy2013}}
| temperature = (502 ± 10)—(539 ± 12){{r|Dupuy2013}}
| age_gyr = 1–5{{r|Bochanski2011}}
| rotational_velocity = 40 ± 10{{r|Bochanski2011}}
}}
{{Starbox catalog
|names=[[广域红外线巡天探测卫星|WISEPA]] J072227.27-054029.9{{r|Kirkpatrick2011}}
}}
{{Starbox reference
| Simbad=UGPS+J072227.51-054031.2
}}
{{Starbox end}}
[[File:Original near-infrared image of UGPS J0722-05 (geminiann10017a).jpg|thumb|來自UKIRT紅外線深空調查的UGPS J0722-05的原始近紅外線（J 波段）影像]]
'''UGPS J072227.51-054031.2'''（通常简称为'''UGPS 0722-05'''）是一颗晚T型[[棕矮星]]，距离地球大约4.1秒差距（13光年）。{{R|Leggett2012}}

== 观测历史 ==

=== 发现 ===
赫特福德大学的菲利普·卢卡斯于2010年宣布发现了这个[[天体列表|天体]]。发现它的那张照片是2006年11月28日由{{le|英国红外望远镜红外深空巡天|UKIRT Infrared Deep Sky Survey}}（UKIDSS）拍摄的。研究者在2010年3月2日复原的图像确认了它的[[自行]]。{{R|Lucas2010}}文献报道的距离是根据它目前测得的[[视差]]为246[[角分|毫秒]]测得的。这个天体最初被认为距离更近，只有2.9秒差距，如果属实的话这将是距离太阳最近的十颗恒星之一。{{R|Lucas2010v1}}不过后来的测量发现它离地球的距离实际上要远一些，大约是4.1{{±|0.6|0.5}}秒差距。{{R|Lucas2010}}

=== 自适应光学观测 ===
2010年，布伊（Bouy）等人使用[[甚大望远镜]]通过[[自适应光学]]技术来观测UGPS 0722-05。结果没有观测到任何星等''H'' ≲ 19.4并且相距超过50[[角分]]的伴星，也没有星等''H'' ≲ 21.4并且相距超过100角分的伴星。{{R|Bouy2011}}

=== 光谱分类 ===
2010年，卢卡斯等人暂时将UGPS 0722-05的光谱分类设定为T10，并提出这可能是一种新光谱分类的首个实例。{{R|Lucas2010}}

2011年库欣（Cushing）等人发表的论文提出了T型光谱和新提出的Y型光谱之间的区别，其中后者体现了光谱中与[[氨]]相关的特征。他们引入了T/Y转变的光谱特征标准——如何区分T9和Y0。UGPS 0722-05被重新分类为T9，并被宣布为T9型光谱的标准。{{R|Cushing2011}}

== 距离 ==
目前对UGPS 0722-05距离最精确的估计是由莱格特（Leggett）等人通过三角视差法获得的：{{nowrap|0.2428 ± 0.0024 [[角秒]]}}，对应的距离为{{nowrap|4.12 ± 0.04 [[秒差距|pc]]}}或者{{nowrap|13.43 ± 0.13 [[光年|ly]]}}。{{r|Leggett2012}}

== 空间运动 ==
UGPS 0722-05的自行大约为每年970毫角秒。{{r|Leggett2012}}

博昌斯基（Bochanski）等人于2011年发表了UGPS 0722-05的[[径向速度]]测量结果——46.9 ± 2.5 [[千米|km]]/[[秒|s]]。{{r|Bochanski2011}}<ref name="note 2" group="注">径向速度为正值表示UGPS 0722-05目前正离我们远去。它的径向速度（46.9 km/s）明显大于切向速度（19 km/s）表示它过去曾离我们相当近（对自行和视差的假设来自Leggett ''et al.'' (2012)，太阳系距离UGPS 0722-05最近为5.0光年，发生在大约公元前72000年，当时可能是距离最近的恒星之一。</ref>

== 特性 ==
这个天体的体积与[[木星]]相当，但是质量是[[木星质量]]的5–40倍。{{r|Lucas2010}}这使得它的质量小于[[印第安座ε#性质|印第安座ε星Ba]]。行星的质量小于13倍[[木星质量]]。[[红外光谱]]表明它含有水蒸气和[[甲烷]]，表面温度大约为480–560 [[开尔文|K]]。{{r|Lucas2010}}

== 注释 ==
{{Reflist|group = 注}}

== 参考文献 ==
{{Reflist|colwidth = 30em|refs = <ref name="Lucas2010v1">{{cite arXiv
  |last=Lucas |first=Philip W.
  |author2=Tinney
  |author3=Burningham
  |author4=Leggett
  |author5=Pinfield
  |author6=Smart
  |display-authors=etal
  |title=Discovery of a very cool brown dwarf amongst the ten nearest stars to the Solar System
  |date=2010
  |eprint=1004.0317v1
  |class=astro-ph.SR}}</ref>
<ref name="Lucas2010">{{cite journal|title=The discovery of a very cool, very nearby brown dwarf in the Galactic plane|journal=Monthly Notices of the Royal Astronomical Society: Letters|url=https://academic.oup.com/mnrasl/article/408/1/L56/1008271|date=2010-10-01|volume=408|issue=1|doi=10.1111/j.1745-3933.2010.00927.x|pages=L56–L60|issn=1745-3925|language=en|accessdate=2018-04-03|author=P. W. Lucas, C. G. Tinney, Ben Burningham, S. K. Leggett, David J. Pinfield, Richard Smart, Hugh R. A. Jones, Federico Marocco, Robert J. Barber, Sergei N. Yurchenko, Jonathan Tennyson, Miki Ishii, Motohide Tamura, Avril C. Day-Jones, Andrew Adamson, France Allard, Derek Homeier|archive-date=2021-03-24|archive-url=https://web.archive.org/web/20210324114426/https://academic.oup.com/mnrasl/article/408/1/L56/1008271|dead-url=no}}</ref>
<ref name="Bouy2011">{{cite journal|url=http://www.aanda.org/10.1051/0004-6361/201015289|title=Adaptive optics observations of the T10 ultracool dwarf UGPS J072227.51-054031.2|journal=Astronomy & Astrophysics|volume=526|date=2011-02-01|issn=0004-6361|language=en|accessdate=2018-04-03|doi=10.1051/0004-6361/201015289|author=H. Bouy, J. H. V. Girard, E. L. Martín, N. Huélamo, P. W. Lucas}}</ref>
<ref name="Bochanski2011">{{cite journal|title=FIRE Spectroscopy of the Ultra-cool Brown Dwarf, UGPS J072227.51–054031.2: Kinematics, Rotation and Atmospheric Parameters|journal=The Astronomical Journal|volume=142|issue=5|pages=169|url=http://stacks.iop.org/1538-3881/142/i=5/a=169|date=2011|doi=10.1088/0004-6256/142/5/169|issn=1538-3881|language=en|accessdate=2018-04-03|author=John J. Bochanski, Adam J. Burgasser, Robert A. Simcoe, Andrew A. West}}</ref>
<ref name="Kirkpatrick2011">{{cite journal|title=The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)|journal=The Astrophysical Journal Supplement Series|volume=197|issue=2|pages=19|url=http://stacks.iop.org/0067-0049/197/i=2/a=19|date=2011|doi=10.1088/0067-0049/197/2/19|issn=0067-0049|language=en|accessdate=2018-04-03|author=J. Davy Kirkpatrick, Michael C. Cushing, Christopher R. Gelino, Roger L. Griffith, Michael F. Skrutskie, Kenneth A. Marsh, Edward L. Wright, A. Mainzer, Peter R. Eisenhardt, Ian S. McLean,  Maggie A. Thompson, James M. Bauer, Dominic J. Benford, Carrie R. Bridge, Sean E. Lake, Sara M. Petty, S. A. Stanford, Chao-Wei Tsai, Vanessa Bailey, Charles A. Beichman, Joshua S. Bloom, John J. Bochanski,  Adam J. Burgasser, Peter L. Capak, Kelle L. Cruz, Philip M. Hinz, Jeyhan S. Kartaltepe, Russell P. Knox,  Swarnima Manohar, Daniel Masters, Maria Morales-Calderón, Lisa A. Prato, Timothy J. Rodigas, Mara Salvato, Steven D. Schurr, Nicholas Z. Scoville, Robert A. Simcoe, Karl R. Stapelfeldt, Daniel Stern, Nathan D. Stock, William D. Vacca}}</ref>
<ref name="Cushing2011">{{cite journal|title=The Discovery of Y Dwarfs using Data from the Wide-field Infrared Survey Explorer (WISE)|journal=The Astrophysical Journal|volume=743|issue=1|pages=50|url=http://stacks.iop.org/0004-637X/743/i=1/a=50|date=2011|doi=10.1088/0004-637x/743/1/50|issn=0004-637X|language=en|accessdate=2018-04-03|author=Michael C. Cushing, J. Davy Kirkpatrick, Christopher R. Gelino, Roger L. Griffith, Michael F. Skrutskie, A. Mainzer, Kenneth A. Marsh, Charles A. Beichman, Adam J. Burgasser, Lisa A. Prato, Robert A. Simcoe, Mark S. Marley, D. Saumon, Richard S. Freedman, Peter R. Eisenhardt, Edward L. Wright}}</ref>
<ref name="Leggett2012">{{cite journal|title=The Properties of the 500 K Dwarf UGPS J072227.51–054031.2 and a Study of the Far-red Flux of Cold Brown Dwarfs|journal=The Astrophysical Journal|volume=748|issue=2|pages=74|url=http://stacks.iop.org/0004-637X/748/i=2/a=74|date=2012|doi=10.1088/0004-637x/748/2/74|issn=0004-637X|language=en|accessdate=2018-04-03|author=S. K. Leggett, D. Saumon, M. S. Marley, K. Lodders, J. Canty, P. Lucas, R. L. Smart, C. G. Tinney,  D. Homeier, F. Allard, Ben Burningham, A. Day-Jones, B. Fegley, Miki Ishii, H. R. A. Jones, F. Marocco, D. J. Pinfield, M. Tamura}}</ref>
<ref name="Dupuy2013">{{rr/2013arXiv1309.1422D}}</ref>}}

== 外部链接 ==
* [http://www.solstation.com/stars/u722-05.htm Article on UGPS 0722-05 at SolStation.com] {{Wayback|url=http://www.solstation.com/stars/u722-05.htm |date=20211026095927 }}
[[Category:棕矮星]]
[[Category:麒麟座]]
[[Category:T型恒星]]
[[Category:WISE天体]]