WISE J0254+0223

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Coordinates: Sky map 02h 54m 09.62s, +02° 23′ 58.85″

WISEPA J025409.45+022359.1
Observation data
Epoch MJD 55588.27[1]:{{{3}}}      Equinox J2000[1]:{{{3}}}
Constellation Cetus
Right ascension 02h 54m 09.62s[1]:{{{3}}}
Declination 02° 23′ 58.85″[1]:{{{3}}}
Characteristics
Spectral type T8[1]:{{{3}}}
Apparent magnitude (Y (MKO filter system)) 16.999±0.014[2]:{{{3}}}
Apparent magnitude (J (2MASS filter system)) 16.557±0.156[1]:{{{3}}}
Apparent magnitude (J (MKO filter system)) 15.916±0.008[2]:{{{3}}}
Apparent magnitude (H (2MASS filter system)) 15.884±0.199[1]:{{{3}}}
Apparent magnitude (H (MKO filter system)) 16.29±0.02[2]:{{{3}}}
Apparent magnitude (KS (2MASS filter system)) >16.006[1]:{{{3}}}
Apparent magnitude (K (MKO filter system)) 16.73±0.05[2]:{{{3}}}
Astrometry
Proper motion (μ) RA: 2588±27[3]:{{{3}}} mas/yr
Dec.: 273±27[3]:{{{3}}} mas/yr
Parallax (π) 135 ± 15[3]:{{{3}}} mas
Distance approx. 24 ly
(approx. 7.4 pc)
Other designations
WISEPC J025409.45+022359.1[4]:{{{3}}}
WISEPA J025409.45+022359.1[1]:{{{3}}}
WISE J0254+0223[1]:{{{3}}}
PSO J043.5395+02.3995[5]:{{{3}}}
PSO J043.5+02[5]:{{{3}}}

WISEPA J025409.45+022359.1 (designation is abbreviated to WISE 0254+0223) is a brown dwarf of spectral class T8,[1]:{{{3}}}[6]:{{{3}}} located in constellation Cetus at approximately 24.2 light-years from Earth.[3]:{{{3}}}

History of observations

Discovery

WISE 0254+0223 was discovered in 2011 from data, collected by Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satellite — NASA infrared-wavelength 40 cm (16 in) space telescope, which mission lasted from December 2009 to February 2011. WISE 0254+0223 has two discovery papers: Scholz et al. (2011) and Kirkpatrick et al. (2011) (the first was published earlier).[4]:{{{3}}}[1]:{{{3}}}

  • Scholz et al. discovered two late T-type brown dwarfs, including WISE 0254+0223, using preliminary data release from WISE and follow-up near-infrared spectroscopy with LUCIFER1 near-infrared camera/spectrograph at the Large Binocular Telescope (LBT).
  • Kirkpatrick et al. presented discovery of 98 new found by WISE brown dwarf systems with components of spectral types M, L, T and Y, among which also was WISE 0254+0223.[1]:{{{3}}}[~ 1]

Distance

Currently the most accurate distance estimate of WISE 0254+0223 is a trigonometric parallax, measured using Spitzer Space Telescope and published in 2013 by Trent Dupuy and Adam Kraus: 0.135 ± 0.015 arcsec, corresponding to a distance 7.4+0.9
−0.7 pc, or 24.2+3.0
−2.4 ly.[3]:{{{3}}}

WISE 0254+0223 distance estimates

Source Parallax, mas Distance, pc Distance, ly Ref.
Scholz et al. (2011) (preprint version 1) 5.5+1.4
−1.1		 17.9+4.6
−3.6		 [7]:{{{3}}}
Scholz et al. (2011) 5.5+2.3
−1.6		 17.9+7.5
−5.2		 [4]:{{{3}}}
Kirkpatrick et al. (2011), Table 6 ~ 6.9 ~ 22.5 [1]:{{{3}}}
Kirkpatrick et al. (2011), Table 7 165±46 6.1+2.3
−1.3		 19.8+7.6
−4.3		 [1]:{{{3}}}
Liu et al. (2011) 7.2±0.7 23.5±2.3 [5]:{{{3}}}
Liu et al. (2011) 171±45 5.8+2.1
−1.2		 19.1+7.8
−4.0		 [5]:{{{3}}}
Scholz et al. (2012) 165±20 6.1+0.8
−0.7		 19.8+2.7
−2.1		 [8]:{{{3}}}
Marsh et al. (2013)
(according Kirkpatrick et al. (2012))		 166±26 6.0+1.1
−0.8		 19.6+3.6
−2.7		 [6]:{{{3}}}
Marsh et al. (2013) 185±42 4.9+1.0
−0.6[~ 2]		 16.0+3.3
−2.0		 [9]:{{{3}}}
Dupuy & Kraus (2013) 135 ± 15[~ 3] 7.4+0.9
−0.7		 24.2+3.0
−2.4		 [3]:{{{3}}}

Non-trigonometric distance estimates are marked in italic. The most accurate estimate is marked in bold.

Space motion

WISE 0254+0223 has a large proper motion of about 2602 milliarcseconds per year.[3]:{{{3}}}

WISE 0254+0223 proper motion estimates

Source μ,
mas/yr		 P. A.,
°		 μRA,
mas/yr		 μDEC,
mas/yr		 Ref.
Scholz et al. (2011) 2511 84 2496±46 276±47 [4]:{{{3}}}
Kirkpatrick et al. (2011) 2546 85 2534±28 243±37 [1]:{{{3}}}
Marsh et al. (2013) 2596 83 2578±42 309±50 [9]:{{{3}}}
Dupuy & Kraus (2013) 2602±27 84.0±0.6 2588±27 273±27 [3]:{{{3}}}

The most accurate estimates are marked in bold.

See also

Another object, discovered by Scholz et al. (2011):[4]:{{{3}}}

Notes

  1. ↑ These 98 brown dwarf systems are only among first, not all brown dwarf systems, discovered from data, collected by WISE: 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.
  2. ↑ In this parallax and distance estimates the most probable distance value does not equal to inverse maximum likelihood parallax value, as would be in the case of exact parallax and distance values. This is because Marsh et al. used a more sophisticated method of converting maximum likelihood parallaxes into most probable distances, that uses also some prior information, and not just the calculation of the inverse value. (The method description see in Marsh et al. (2013), Section 4).
  3. ↑ Relative parallax.

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 5.2 5.3 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ 9.0 9.1 Lua error in package.lua at line 80: module 'strict' not found.

External links

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