WISE J0254+0223

WISEPA J025409.45+022359.1 is a brown dwarf of spectral class T8, located in constellation Cetus at approximately 22.3 light-years from Earth. It was discovered by astronomers from the Leibniz Institute for Astrophysics Potsdam.

History of observations

Discovery

WISE 0254+0223 was discovered in 2011 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. WISE 0254+0223 has two discovery papers: Scholz et al. and Kirkpatrick et al. .

Scholz et al. discovered two late T-type brown dwarfs, including WISE 0254+0223, using preliminary data release from WISE and follow-up near-infrared spectroscopy with near-infrared camera/spectrograph at the Large Binocular Telescope (LBT).
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 0254+0223.

Distance

Currently the most accurate distance estimate of WISE 0254+0223 is a trigonometric parallax, measured using the Spitzer Space Telescope and published in 2019 by Kirkpatrick et al.:, corresponding to a distance, or.
WISE 0254+0223 distance estimates

Source	Parallax, mas	Distance, pc	Distance, ly	Ref.
Scholz et al.		'	'
Scholz et al.		'	'
Kirkpatrick et al., Table 6		~ 6.9	~ 22.5
Kirkpatrick et al., Table 7
Liu et al.		'	'
Liu et al.
Scholz et al.
Marsh et al.
Marsh et al.			16.0
Dupuy & Kraus	135 ± 15	'	'

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

Space motion

WISE 0254+0223 has a large proper motion of about milliarcseconds per year.
WISE 0254+0223 proper motion estimates

Source	μ, mas/yr	P. A., °	μ_RA, mas/yr	μ_DEC, mas/yr	Ref.
Scholz et al.		84
Kirkpatrick et al.		85
Marsh et al.		83
Dupuy & Kraus	'	'	'	'

The most accurate estimates are marked in bold.