| 词条 | WISE 1541−2250 |
| 释义 |
|name=WISEPA J154151.66−225025.2 }}{{Starbox observe |epoch=MJD 55424.68{{r|Kirkpatrick2011}} |equinox=J2000{{r|Kirkpatrick2011}} |constell=Libra |ra={{RA|15|41|51.57}}{{r|Kirkpatrick2011}} |dec={{DEC|−22|50|25.03}}{{r|Kirkpatrick2011}}}}{{Starbox character |class=Y0.5{{r|Kirkpatrick2012}} |appmag_1_passband=J (MKO filter system) |appmag_1=21.16 ± 0.36{{r|Kirkpatrick2011}} |appmag_2_passband=H (MKO filter system) |appmag_2=20.99 ± 0.52{{r|Kirkpatrick2011}} }}{{Starbox astrometry |prop_mo_ra = {{pmcon|rer|899.0|4.2|264.4|0.3}} |prop_mo_dec = {{pmcon|ded|899.0|4.2|264.4|0.3}} |pm_footnote={{r|Tinney2014}} |parallax=175.1 |p_error=4.4 |parallax_footnote={{r|Tinney2014}} }}{{Starbox detail |mass_mj=12 (8–12){{r|Cushing2011}} |radius_rj=1.01 (1.01–1.07){{r|Cushing2011}} |gravity=4.50 (4.25–4.5){{r|Cushing2011}} |temperature=350{{r|Cushing2011}}}}{{Starbox catalog |names=WISEPA J154151.66−225025.2{{r|Kirkpatrick2011}} WISEP J1541−2250{{r|Cushing2011}} WISE J1541−2250{{r|Kirkpatrick2011}} WISE 1541−2250{{r|Kirkpatrick2011}}}}{{Starbox reference |Simbad=WISE+J154151.65-225024.9 }}{{Starbox end}} WISE 1541−2250 (full designation WISEPA J154151.66−225025.2) is a sub-brown or brown dwarf of spectral class Y0.5,{{r|Kirkpatrick2012}} located in the constellation Libra at approximately 18.6 light-years from Earth.{{r|Tinney2014}} This object received popular attention when its discovery was announced in 2011 at a distance estimated to be only about 9 light-years, which would have made it the closest brown dwarf known.[1] (For really close brown dwarfs see, for example, Luhman 16, WISE 1506+7027, Epsilon Indi Ba, Bb, or UGPS 0722-05). It is not the farthest known Y-type brown dwarf to Earth. History of observationsDiscoveryWISE 1541−2250 was discovered in 2011 from data collected by the Wide-field Infrared Survey Explorer (WISE) in the infrared at a wavelength of 40 cm (16 in), whose mission lasted from December 2009 to February 2011. WISE 1541−2250 has two discovery papers: Kirkpatrick et al. (2011) and Cushing et al. (2011) with mostly the same authors and published nearly simultaneously.{{r|Kirkpatrick2011|Cushing2011}}
DistanceCurrently the most accurate distance estimate of WISE 1541−2250 is a trigonometric parallax, published in 2014 by Tinney et al.: 0.1751 ± 0.0044 arcsec, corresponding to a distance 5.71{{±|0.15|0.14}} pc, or 18.6 ± 0.5 ly.{{r|Tinney2014}} For several months after its discovery, before the publication of its parallax by Kirkpatrick et al. in 2012,{{r|Kirkpatrick2012}} WISE 1541−2250 was considered to be the nearest known brown dwarf at approximately 9 light-years from the Sun, and the seventh-nearest of all star systems, at slightly more than twice the distance of the nearest known star system Alpha Centauri. This view existed because of a very rough preliminary parallax with a baseline of 1.2 years, published in the discovery paper: 0.351 ± 0.108 arcsec, corresponding to a distance 2.8{{±|1.3|0.6}} pc, or 9.3{{±|4.1|2.2}} ly.{{r|Kirkpatrick2011}} Also, there were other estimates: spectrophotometric distance estimate 8.2 pc (26.7 ly),{{r|Kirkpatrick2011}} and photometric distance estimate 1.8{{±|0.2|0}} pc (5.9{{±|0.6|0}} ly).{{r|Cushing2011}} Space motionWISE 1541−2250 has proper motion of about 899 milliarcseconds per year.{{r|Tinney2014}} Spectral class and temperatureWISE 1541−2250 is among the first known examples of a Y-class brown dwarf, the coldest spectral class of stars, and has temperature about 350 K{{r|Cushing2011}} (about 77 °C / 170 °F). Its spectral class is Y0.5{{r|Kirkpatrick2012}} (initially was estimated as Y0).{{r|Kirkpatrick2011|Cushing2011}} See alsoThe other six discoveries of brown dwarfs, published in Cushing et al. (2011):{{r|Cushing2011}}
Lists:
Notes1. ^{{cite web |date=2011-08-23|title=NASA'S Wise Mission Discovers Coolest Class of Stars |publisher=WISE Mission News (2011-263) |url=http://www.nasa.gov/mission_pages/WISE/news/wise20110823.html}} 2. ^These 98 brown-dwarf systems are among the first brown-dwarf systems discovered in data collected by WISE and six discoveries were published earlier (however, also listed in Kirkpatrick et al. (2011)) in Mainzer et al. (2011) and Burgasser et al. (2011), and the other discoveries were published later. 3. ^{{cite journal |last=Cushing |first=Michael C. |title=The Discovery of Y Dwarfs using Data from the Wide-field Infrared Survey Explorer (WISE) |year=2011 |doi=10.1088/0004-637X/743/1/50 |bibcode=2011ApJ...743...50C|journal=The Astrophysical Journal |volume= 743 |pages=50 |number =1 |last2=Kirkpatrick |first2=J. Davy |last3=Gelino |first3=Christopher R. |last4=Griffith |first4=Roger L. |last5=Skrutskie |first5=Michael F. |last6=Mainzer |first6=A. |last7=Marsh |first7=Kenneth A. |last8=Beichman |first8=Charles A. |last9=Burgasser |first9=Adam J. |last10=Prato |first10=Lisa A. |last11=Simcoe |first11=Robert A. |last12=Marley |first12=Mark S. |last13=Saumon |first13=D. |last14=Freedman |first14=Richard S. |last15=Eisenhardt |first15=Peter R. |last16=Wright |first16=Edward L. |arxiv = 1108.4678 }} 4. ^{{cite journal | authorlink=J. Davy Kirkpatrick | last=Kirkpatrick |first=J. Davy |author2=Cushing, Michael C. |author3=Gelino, Christopher R. |author4=Griffith, Roger L. |author5=Skrutskie, Michael F. |author6=Marsh, Kenneth A. |author7=Wright, Edward L. |author8=Mainzer, A. |author9=Eisenhardt, Peter R. |author10=McLean, Ian S. |author11=Thompson, Maggie A. |author12=Bauer, James M. |author13=Benford, Dominic J. |author14=Bridge, Carrie R. |author15=Lake, Sean E. |author16=Petty, Sara M. |author17=Stanford, S. A. |author18=Tsai, Chao-Wei |author19=Bailey, Vanessa |author20=Beichman, Charles A. |author21=Bloom, Joshua S. |author22=Bochanski, John J. |author23=Burgasser, Adam J. |author24=Capak, Peter L. |author25=Cruz, Kelle L. |author26=Hinz, Philip M. |author27=Kartaltepe, Jeyhan S. |author28=Knox, Russell P. |author29=Manohar, Swarnima |author30=Masters, Daniel |author31=Morales-Calderon, Maria |author32=Prato, Lisa A. |author33=Rodigas, Timothy J. |author34=Salvato, Mara |author35=Schurr, Steven D. |author36=Scoville, Nicholas Z. |author37=Simcoe, Robert A. |author38=Stapelfeldt, Karl R. |author39=Stern, Daniel |author40=Stock, Nathan D. |author41=Vacca, William D. | title=The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE) | date=2011 | journal=The Astrophysical Journal Supplement | volume=197 | issue=2 | pages=19 | arxiv=1108.4677v1 | doi=10.1088/0067-0049/197/2/19 | bibcode=2011ApJS..197...19K}} 5. ^{{cite journal | authorlink=J. Davy Kirkpatrick | last1=Kirkpatrick | last2=Gelino |first1=J. D. | first2=C. R. | last3=Cushing | first3=M. C. | last4=Mace | first4=G. N. | last5=Griffith | first5=R. L. | last6=Skrutskie | first6=M. F. | last7=Marsh | first7=K. A. | last8=Wright | first8=E. L. | last9=Eisenhardt | first9=P. R. | last10=McLean | first10=I. S. | last11=Mainzer | first11=A. K. | last12=Burgasser | first12=A. J. | last13=Tinney | first13=C. G. | last14=Parker | first14=S. | last15=Salter | first15=G. | title=Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function | year=2012 | journal=The Astrophysical Journal | volume=753 | issue=2 | pages=156 | arxiv=1205.2122 | doi=10.1088/0004-637X/753/2/156 | bibcode=2012ApJ...753..156K}} 6. ^{{cite journal |last1=Tinney |first1=C. G. |last2=Faherty |first2=Jacqueline K. |last3=Kirkpatrick |first3=J. Davy |last4=Cushing |first4=Mike |last5=Morley |first5=Caroline V. |last6=Wright |first6=Edward L. |title=The Luminosities of the Coldest Brown Dwarfs |year=2014 |journal=The Astrophysical Journal |volume=796 | issue=1 | pages=39 |arxiv=1410.0746 |doi=10.1088/0004-637X/796/1/39 |bibcode=2014ApJ...796...39T}} References{{reflist|colwidth=30em|refs=[3][4][5][6]}}
External links
|last=Choi |first=C. Q. |date=August 26, 2011 |title=Y dwarf star? Because they're cool, that's Y! |url=http://www.space.com/12714-coldest-failed-stars-brown-dwarfs-wise.html |publisher=Space.com |accessdate=August 31, 2011 }}
5 : Brown dwarfs|Y-type stars|Libra (constellation)|Astronomical objects discovered in 2011|WISE objects |
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