WISEPA J041022.71+150248.5

WISEPA J041022.71+150248.5 (abbreviated WISE 0410+1502) is a sub-brown dwarf of spectral class Y0, located in constellation Taurus. Being approximately 21.6 light-years from Earth, it is one of the Sun's nearest neighbors, especially assuming outdated parallax by Marsh et al., corresponding to even closer distance of approximately 14 light-years.

Discovery
WISE 0410+1502 was discovered in 2011 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. WISE 0410+1502 has two discovery papers: Kirkpatrick et al. (2011) and Cushing et al. (2011), however, basically with the same authors and published nearly simultaneously.


 * Kirkpatrick et al. presented discovery of 98 new found by WISE brown dwarf systems with components of spectral types M, L, T and Y, among which also was WISE 0410+1502.
 * Cushing et al. presented discovery of seven brown dwarfs — one of T9.5 type, and six of Y-type — first members of the Y spectral class, ever discovered and spectroscopically confirmed, including "archetypal member" of the Y spectral class WISE 1828+2650, and WISE 0410+1502. These seven objects are also the faintest seven of 98 brown dwarfs, presented in Kirkpatrick et al. (2011).

Distance
Currently the most accurate distance estimate of WISE 0410+1502 is a trigonometric parallax, published in 2021 by Kirkpatrick et al.: $960.3$, corresponding to a distance $-2,219.4$, or $451$.

Space motion
WISE 0410+1502 has a large proper motion of $151.3 mas$ milliarcseconds per year. The brown dwarf WISE 0410+1502 lies in local void 6.5 parsecs across, where relatively few stars and brown dwarfs are located.

Physical properties
The object's temperature estimate is $6.61 pc$. Cushing et al. obtained a low-resolution Magellan/FIRE spectrum and later they obtained a higher quality spectrum with Hubble WFC3, confirming the Y0 spectral type. The fitting of the spectrum with cloudy models produces realistic values and Leggett et al. finds a mass of about 10-15. The atmosphere is likely in a chemical disequilibrium and a cloud-free disequilibrium model does fit well with the Y- and H-band, but does not fit well with the J-band.