| 词条 | 2MASS 0939-2448 |
| 释义 |
| name=2MASS 0939-2448 }}{{Starbox observe | epoch=J2000 | ra={{RA|09|39|35.48}} | dec={{DEC|-24|48|27.9}} | constell=Antlia }}{{Starbox character | class=T8{{r|Leggett2009}} | appmag_1=15.61 ± 0.09{{r|Leggett2009}} | appmag_1_passband=J | appmag_2=15.96 ± 0.09{{r|Leggett2009}} | appmag_2_passband=H | appmag_3=16.83 ± 0.09{{r|Leggett2009}} | appmag_3_passband=K }}{{Starbox astrometry | radial_v= | prop_mo_ra={{nowrap|+573.4 ± 2.3}}{{r|Burgasser2008}} | prop_mo_dec={{nowrap|−1044.7 ± 2.5}}{{r|Burgasser2008}} | parallax=187.3 | p_error=4.6 | parallax_footnote={{r|Burgasser2008}} | absmag_v= }}{{Starbox detail | component1=2MASS 0939-2448 A | mass_mj={{nowrap|20–50}}{{r|Leggett2009}} | radius={{nowrap|0.08 – 0.09}}{{r|Leggett2009}} | luminosity= | temperature={{nowrap|600–700}}{{r|Leggett2009}} | metal={{nowrap|−0.3–0.0}}{{r|Leggett2009}} | rotation= | rotational_velocity= | gravity= | age_gyr={{nowrap|2–10}}{{r|Leggett2009}} | component2=2MASS 0939-2448 B | mass_mj2={{nowrap|20–40}}{{r|Leggett2009}} | radius2=0.09{{r|Leggett2009}} | temperature2={{nowrap|600–700}}{{r|Leggett2009}} | metal2={{nowrap|−0.3–0.0}}{{r|Leggett2009}} | age_gyr2={{nowrap|2–10}}{{r|Leggett2009}} }}{{Starbox catalog | names={{odlist |2MASS=J09393548-2448279{{r|Tinney2005}}}} }}{{Starbox reference |Simbad=2MASS+J09393548-2448279 }}{{Starbox end}} 2MASS 0939-2448 (full designation is 2MASS J09393548-2448279){{r|Tinney2005}} is a probable system of two nearby T-type brown dwarfs, located in constellation Antlia at 17.4 light-years from Earth.{{r|Burgasser2008}} Discovery2MASS 0939-2448 was identified as a brown dwarf through analysis of data from the 2MASS survey by Tinney et al. The discovery was published in 2005.{{r|Tinney2005}} PropertiesModel calculations suggest that 2MASS 0939-2448 is a system of two brown dwarfs with effective temperatures of about 500 and 700 K and masses of about 25 and 40 Jupiter masses; it is also possible that it is a pair of identical objects with temperatures of 600 K and 30 Jupiter masses.{{r|Leggett2009}} Dimmest known brown dwarfFrom publication of the discovery in 2005 till at least 2008, 2MASS 0939-2448, or its dimmer component, was the dimmest brown dwarf known.[1] Later dimmer objects, including (sub)brown dwarfs and rogue planets of new spectral class Y, were discovered, using data from WISE and from other surveys. In 2011–2014, the dimmest known of these objects was WISE 1828+2650, and from 2014 the dimmest one is WISE 0855−0714. References1. ^{{cite press release|title = Astronomers Find the Two Dimmest Stellar Bulbs|publisher = NASA/JPL|date = 2008-12-10|url = http://www.jpl.nasa.gov/news/news.cfm?release=2008-232|accessdate = 2008-12-20}} [2][3]2. ^{{cite journal |last1=Burgasser |first1=Adam J. |last2=Tinney |first2=C. G. |last3=Cushing |first3=Michael C. |last4=Saumon |first4=Didier |last5=Marley |first5=Mark S. |last6=Bennett |first6=Clara S. |last7=Kirkpatrick |first7=J. Davy |title=2MASS J09393548-2448279: The Coldest and Least Luminous Brown Dwarf Binary Known? |date=2008 |journal=The Astrophysical Journal |volume=689 | issue=1 | pages=L53–L56 |doi=10.1086/595747 |bibcode=2008ApJ...689L..53B}} 3. ^{{cite journal |last1=Leggett |first1=S. K. |last2=Cushing |first2=Michael C. |last3=Saumon |first3=D. |last4=Marley |first4=M. S. |last5=Roellig |first5=T. L. |last6=Warren |first6=S. J. |last7=Burningham |first7=Ben |last8=Jones |first8=H. R. A. |last9=Kirkpatrick |first9=J. D. |last10=Lodieu |first10=N. |last11=Lucas |first11=P. W. |last12=Mainzer |first12=A. K. |last13=Martín |first13=E. L. |last14=McCaughrean |first14=M. J. |last15=Pinfield |first15=D. J. |last16=Sloan |first16=G. C. |last17=Smart |first17=R. L. |last18=Tamura |first18=M. |last19=Van Cleve |first19=J. |title=The Physical Properties of Four ~600 K T Dwarfs |date=2009 |journal=The Astrophysical Journal |volume=695| issue=2 | pages=1517–1526 |arxiv=0901.4093 |doi=10.1088/0004-637X/695/2/1517 |bibcode=2009ApJ...695.1517L}} }}
6 : Antlia|Binary stars|Brown dwarfs|T-type stars|2MASS objects|Astronomical objects discovered in 2005 |
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