WISE 1639-6847

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Coordinates: Sky map 16h 39m 40.83s, −68° 47′ 38.6″

WISE J163940.83-684738.6
Observation data
Epoch       Equinox J2000[1]
Constellation Triangulum Australe
Right ascension 16h 39m 40.83s[1]
Declination −68° 47′ 38.6″[1]
Spectral type Y0-Y0.5[1]
Proper motion (μ) RA: 580[1] mas/yr
Dec.: -3014[1] mas/yr
Parallax (π) 202.3 ± 3.1[2] mas
Distance 16.1 ± 0.2 ly
(4.94 ± 0.08 pc)
Other designations
WISEPC J163940.83-684738.6[1]
WISE 1639-6847[3]

WISE J163940.83-684738.6 (designation is abbreviated to WISE 1639-6847[3], or W1639[1]) is a brown dwarf of spectral class Y0-Y0.5,[1] located in constellation Triangulum Australe (it's the nearest star / brown dwarf in this constellation) at approximately 16 light-years from Earth.[1]


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.[1]


Trigonometric parallax of WISE 1639-6847, published in its discovery paper, is 200 ± 20 mas, corresponding to a distance of 5.0+0.6
pc, or 16.3+1.8

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.

Space motion[edit]

WISE 1639-6847 has a very large[1] proper motion of about 3069 milliarcseconds per year.[1]

WISE 1639-6847 proper motion estimates

Source μ,
P. A.,
Tinney et al. (2012) 3069 ± 40 169.1 ± 0.4 580 -3014 [1]

The most accurate estimates are marked in bold.

Physical properties[edit]

WISE 1639-6847 has absolute magnitude in J-band 22.14 ± 0.22.[1]


  1. ^ a b c d e f g h i j k l m n o p q r 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. arXiv:1209.6123. Bibcode:2012ApJ...759...60T. doi:10.1088/0004-637X/759/1/60.  edit
  2. ^ The Luminosities of the Coldest Brown Dwarfs
  3. ^ a b 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.