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2MASS J11145133−2618235

Brown dwarf star in the constellation Hydra

Brown dwarf star in the constellation Hydra

2MASS 1114-2618, 2M1114−26, 2M1114−2618, 2MASS 1114−26, 2MASS J1114−2618, WISE J111448.79−261827.7

2MASS J11145133−2618235 (designation abbreviated to 2MASS 1114−2618), or 2M1114−26, or 2M1114−2618, or 2MASS 1114−26, or 2MASS J1114−2618) is a nearby brown dwarf of spectral class T7.5, located in constellation Hydra at approximately 18 light-years from Earth.

Discovery

2MASS 1114−2618 was discovered in 2005 by C. G. Tinney et al. from the 2MASS Wide-Field T Dwarf Search (WFTS), based on observations obtained at the Anglo-Australian Telescope, Siding Spring, Australia. In 2005 Tinney et al. published a paper in The Astronomical Journal, where they presented discovery of five new brown dwarfs of spectral type T, among which also was 2MASS 1114−2618.

Distance

Trigonometric parallax of 2MASS 1114−2618, measured in 2012 by Dupuy & Liu under The Hawaii Infrared Parallax Program, is 0.1792 ± 0.0014 arcsec, corresponding to a distance 5.58 ± 0.04 pc, or 18.20 ± 0.14 ly.

The photometric distance estimate of 2MASS 1114−2618, published in its discovery paper in 2005, is 7 pc (22.8 ly). Spectrophotometric distance estimate by Kirkpatrick et al. (2012), is 6.6 pc (21.5 ly).

Proper motion

2MASS 1114−2618 has quite a large proper motion of 3043.2 mas/yr with position angle 262.75 degrees, indicating motion in south-west direction on the sky. At distance 18.20 ly (assuming parallax 179.2 ± 1.4 mas), corresponding tangential velocity is 80.56 km/s.

Notes

References

References

  1. Tinney, C. G.. (2005). "The 2MASS Wide-Field T Dwarf Search. IV. Hunting Out T Dwarfs with Methane Imaging". [[The Astronomical Journal]].
  2. Burgasser, Adam J.. (2006). "A Unified Near-Infrared Spectral Classification Scheme for T Dwarfs". [[The Astrophysical Journal]].
  3. Leggett, Sandy K.. (2007). "Physical and Spectral Characteristics of the T8 and Later Type Dwarfs". [[The Astrophysical Journal]].
  4. Leggett, Sandy K.. (2012). "The Properties of the 500 K Dwarf UGPS J072227.51-054031.2 and a Study of the Far-red Flux of Cold Brown Dwarfs". [[The Astrophysical Journal]].
  5. Kirkpatrick, J. Davy. (2012). "Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function". [[The Astrophysical Journal]].
  6. Faherty, Jacqueline K.. (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". [[The Astrophysical Journal]].
  7. Dupuy, Trent J.. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition". [[The Astrophysical Journal Supplement]].
  8. "2MASS J11145133-2618235 -- Brown Dwarf (M<0.08solMass)". [[Centre de données astronomiques de Strasbourg]].
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