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]
Characteristics
Spectral type Y0-Y0.5[1]
Astrometry
Proper motion (μ) RA: 586 ± 6[2] mas/yr
Dec.: −3101 ± 4[2] 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]
W1639[1]
Database references
SIMBAD data

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.[2]

Discovery[edit]

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]

Distance[edit]

WISE 1639-6847 distance estimates

Source Parallax, mas Distance, pc Distance, ly Distance, Pm Ref.
Tinney et al. (2012) 200±20 5+0.6
−0.5
16.3+1.8
−1.5
154.3+17.1
−14
[1]
Tinney et al. (2014) 202.3±3.1 4.94+0.08
−0.07
16.12+0.25
−0.24
152.5+2.4
−2.3
[2]

Non-trigonometric distance estimates are marked in italic. The most precise estimate is marked in bold.

Space motion[edit]

WISE 1639-6847 has a very large[1] proper motion of about 3156.0 milliarcseconds per year.[2]

WISE 1639-6847 proper motion estimates

Source μ, mas/yr P. A., ° μRA, mas/yr μDEC, mas/yr Ref.
Tinney et al. (2012) 3069 ± 40 169.1 ± 0.4 580 ± 29 −3014 ± 43 [1]
Tinney et al. (2014) 3156.0 ± 3.5 169.3 ± 0.1 586 ± 6 −3101 ± 4 [2]

The most accurate estimates are marked in bold. Italic are computed values, not italic are values, given in the sources.

Physical properties[edit]

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

References[edit]

  1. ^ a b c d e f g h i j k l m 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. ^ a b c d e f g 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. arXiv:1410.0746. Bibcode:2014ApJ...796...39T. doi:10.1088/0004-637X/796/1/39.  edit
  3. ^ a b Dupuy, T. J.; Kraus, A. L. (2013). "Distances, Luminosities, and Temperatures of the Coldest Known Substellar Objects". Science 341 (6153): 1492. doi:10.1126/science.1241917.