Epoch Equinox J2000
|Right ascension||16h 39m 40.83s|
|Declination||−68° 47′ 38.6″|
|Proper motion (μ)||RA: ±6586 mas/yr
Dec.: ±4−3101 mas/yr
|Parallax (π)||202.3 ± 3.1 mas|
|Distance||16.1 ± 0.2 ly
(4.94 ± 0.08 pc)
WISE J163940.83-684738.6 (designation is abbreviated to WISE 1639-6847, or W1639) is a brown dwarf of spectral class Y0-Y0.5, located in constellation Triangulum Australe (it's the nearest star / brown dwarf in this constellation) at approximately 16 light-years from Earth.
WISE 1639-6847 was discovered in 2012 by C. G. Tinney et al. 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.
In 2012 Tinney et al. carried out follow-up observations of WISE 1639-6847 using the FourStar infrared mosaic camera mounted on the 6.5 m Magellan Baade telescope at Las Campanas Observatory, Chile (on 2012 May 10–11 (UT)); and spectroscopy using the Folded-port Infrared Echellette (FIRE) also mounted on the 6.5 m Magellan Baade telescope (on 2012 July 10 (UT)).
In 2012 Tinney et al. published a paper in The Astrophysical Journal, where they presented discovery of a newfound by WISE Y-type brown dwarf WISE 1639-6847 (the only brown dwarf discovery, presented in the article): the paper was accepted for publication on 20 September 2012, submitted to arXiv on 27 September 2012, and published in November 2012.
- Tinney, C. G.; Faherty, J. K.; Kirkpatrick, J. D.; Wright, E. L.; Gelino, C. R.; Cushing, M. C.; Griffith, R. L.; Salter, G. (2012). "WISE J163940.83–684738.6: A Y Dwarf Identified by Methane Imaging". The Astrophysical Journal. 759 (4): 60. Bibcode:2012ApJ...759...60T. arXiv: . doi:10.1088/0004-637X/759/1/60.
- Tinney, C. G.; Faherty, Jacqueline K.; Kirkpatrick, J. Davy; Cushing, Mike; Morley, Caroline V.; Wright, Edward L. (2014). "The Luminosities of the Coldest Brown Dwarfs". The Astrophysical Journal. 796 (1): 39. Bibcode:2014ApJ...796...39T. arXiv: . doi:10.1088/0004-637X/796/1/39.
- Dupuy, T. J.; Kraus, A. L. (2013). "Distances, Luminosities, and Temperatures of the Coldest Known Substellar Objects". Science. 341 (6153): 1492–5. Bibcode:2013Sci...341.1492D. PMID 24009359. arXiv: . doi:10.1126/science.1241917.
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