WISE J163940.83−684738.6 (designation is abbreviated to WISE 1639−6847[4], 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.[2]

WISE J163940.83−684738.6

Observation data Epoch J2000      Equinox J2000
Constellation	Triangulum Australe
Right ascension	16h 39m 40.83s[1]
Declination	−68° 47′ 38.6″[1]
Characteristics
Spectral type	Y0-Y0.5[1]
Astrometry
Proper motion (μ)	RA: 586±6 mas/yr[2] Dec.: −3101±4 mas/yr[2]
Parallax (π)	211.11 ± 0.56 mas[3]
Distance	15.45 ± 0.04 ly (4.74 ± 0.01 pc)
Other designations
WISEPC J163940.83-684738.6[1] WISE 1639-6847[4] W1639[1]
Database references
SIMBAD	data
WISE 1639−6847 Location of WISE 1639−6847 in the constellation Triangulum Australe

Discovery

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]

Physical properties

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

See also

• List of nearest stars and brown dwarfs

References