Epoch Equinox J2000
|Right ascension||16h 39m 40.83s|
|Declination||−68° 47′ 38.6″|
|Proper motion (μ)||RA: 580 mas/yr
Dec.: -3014 mas/yr
|Parallax (π)||200 ± 20 mas|
|Distance||16 ± 2 ly
(5.0 ± 0.5 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.
WISE 1639-6847 distance estimates
|Source||Parallax, mas||Distance, pc||Distance, ly||Ref.|
|Tinney et al. (2012)||200 ± 20||5.0+0.6
Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.
WISE 1639-6847 proper motion estimates
|Tinney et al. (2012)||3069 ± 40||169.1 ± 0.4||580||-3014|||
The most accurate estimates are marked in bold.
- Tinney, C. G.; Faherty, Jacqueline K.; Kirkpatrick, J. Davy; Wright, Edward L.; Gelino, Christopher R.; Cushing, Michael C.; Griffith, Roger L.; Salter, Graeme (2012). "WISE J163940.83–684738.6: A Y Dwarf Identified by Methane Imaging". The Astrophysical Journal 759 (4): 60. arXiv:1209.6123. Bibcode:2012ApJ...759...60T. doi:10.1088/0004-637X/759/1/60.
- Dupuy, Trent J.; Kraus, Adam L. (2013). "Distances, Luminosities, and Temperatures of the Coldest Known Substellar Objects". arXiv:1309.1422v1 [astro-ph.SR]. Bibcode 2013arXiv1309.1422D.
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