WISE 1541−2250

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Coordinates: Sky map 15h 41m 51.57s, −22° 50′ 25.03″

WISEPA J154151.66−225025.2
Observation data
Epoch MJD 55424.68[1]:{{{3}}}      Equinox J2000[1]:{{{3}}}
Constellation Libra
Right ascension 15h 41m 51.57s[1]:{{{3}}}
Declination −22° 50′ 25.03″[1]:{{{3}}}
Characteristics
Spectral type Y0.5[2]:{{{3}}}
Apparent magnitude (J (MKO filter system)) 21.16 ± 0.36[1]:{{{3}}}
Apparent magnitude (H (MKO filter system)) 20.99 ± 0.52[1]:{{{3}}}
Astrometry
Proper motion (μ) RA: −895±5[3]:{{{3}}} mas/yr
Dec.: −88±5[3]:{{{3}}} mas/yr
Parallax (π) 175.1 ± 4.4[3]:{{{3}}} mas
Distance 18.6 ± 0.5 ly
(5.7 ± 0.1 pc)
Details
Mass 12 (8–12)[4]:{{{3}}} MJup
Radius 1.01 (1.01–1.07)[4]:{{{3}}} RJup
Surface gravity (log g) 4.50 (4.25–4.5)[4]:{{{3}}} cgs
Temperature 350[4]:{{{3}}} K
Other designations
WISEPA J154151.66−225025.2[1]:{{{3}}}
WISEP J1541−2250[4]:{{{3}}}
WISE J1541−2250[1]:{{{3}}}
WISE 1541−2250[1]:{{{3}}}
Database references
SIMBAD data
Artist's vision of a Y-dwarf

WISE 1541−2250 (full designation WISEPA J154151.66−225025.2) is a sub-brown or brown dwarf of spectral class Y0.5,[2]:{{{3}}} located in the constellation Libra at approximately 18.6 light-years from Earth.[3]:{{{3}}} 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.[5] (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 observations

Discovery

WISE 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.[1]:{{{3}}}[4]:{{{3}}}

  • Kirkpatrick et al. presented the discovery of 98 brown dwarf systems with components of spectral types M, L, T and Y, among which was WISE 1541−2250.[1]:{{{3}}}[~ 1]
  • Cushing et al. presented the discovery of seven brown dwarfs, one of the T9.5 type and six of the Y-type, the first members of the Y spectral class discovered and spectroscopically confirmed, including an "archetypal member" of the Y spectral class, WISE 1828+2650, and WISE 1541−2250.[4]:{{{3}}} These seven objects are also the faintest seven of 98 brown dwarfs presented in Kirkpatrick et al. (2011).[1]:{{{3}}}

Distance

Currently 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.[3]:{{{3}}}

For several months after its discovery, before the publication of its parallax by Kirkpatrick et al. in 2012,[2]:{{{3}}} 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.[1]:{{{3}}} Also, there were other estimates: spectrophotometric distance estimate 8.2 pc (26.7 ly),[1]:{{{3}}} and photometric distance estimate 1.8+0.2
−0 pc (5.9+0.6
−0 ly).[4]:{{{3}}}

Space motion

WISE 1541−2250 has proper motion of about 899 milliarcseconds per year.[3]:{{{3}}}

Spectral class and temperature

WISE 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[4]:{{{3}}} (about 77 °C / 170 °F). Its spectral class is Y0.5[2]:{{{3}}} (initially was estimated as Y0).[1]:{{{3}}}[4]:{{{3}}}

See also

The other six discoveries of brown dwarfs, published in Cushing et al. (2011):[4]:{{{3}}}

Lists:

Notes

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References

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External links

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