WISE 1639−6847
WISE J163940.83−684738.6 is a brown dwarf of spectral class Y0 pec, located in the constellation Triangulum Australe at 15.5 light-years from Earth. It is the closest star or brown dwarf in its constellation, and the second closest known Y dwarf as of February 2024.
Discovery
WISE 1639−6847 was discovered in 2012 by C. G. Tinney et al. from data, collected by Wide-field Infrared Survey Explorer Earth-orbiting satellite—NASA infrared-wavelength 40 cm 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 ; and spectroscopy using the Folded-port Infrared Echellette also mounted on the 6.5 m Magellan Baade telescope.
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 paper was accepted for publication on 20 September 2012, submitted to arXiv on 27 September 2012, and published in November 2012.