Binary brown dwarf star in the constellation Andromeda
 ;indicator name="01-sky-coordinates" ; ;templatestyles src="Template:Sky/styles.css" / ;Coordinates: &amp;de=42.56944444444445&amp;zoom=&amp;show_grid=1&amp;show_constellation_lines=1&amp;show_constellation_boundaries=1&amp;show_const_names=1&amp;show_galaxies=1&amp;img_source=IMG_all 01h 46m 56.66s, +42° 34′ 10″ ;/indicator ;
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! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000      Equinox J2000
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | Apparent magnitude (H)
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! style="background-color: #FFFFC0; text-align: center;" colspan="2" | Position (relative to WISE 0146+4234A)
WISE J014656.66+423410.0 (designation abbreviated to WISE 0146+4234) is a binary brown dwarf of spectral classes T9 and Y0 located in the constellation Andromeda. It is approximately 60 light-years from Earth.
Analysis of the spectrum shows that the binary is probably old and has a total mass of MJ for an age of 10 billion years. If it is however young (about 1 billion years), it would be a pair of planetary-mass objects with a total mass of MJ. For an old system an orbital period of ≤10 years was predicted. Another work estimated an age of 5 ±3 billion years, which was then used to estimate masses of 7-15 MJ and 6-14 MJ.
Discovery.
WISE 0146+4234 was discovered in 2012 by J. Davy Kirkpatrick 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 Kirkpatrick et al. published a paper in The Astrophysical Journal, where they presented discovery of seven new found by WISE brown dwarfs of spectral type Y, among which also was WISE 0146+4234.
Distance.
The distance of WISE 0146+4234 was initially estimated to be 20 light-years from earth. Later measurements of its stellar parallax showed that it was actually 60 light-years away.
See also.
The other six discoveries of brown dwarfs, published in Kirkpatrick et al. (2012):
References.
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