The brown dwarf is 50 light years from Earth, with a transverse velocity of over 200 km/s – over 25% faster than the next fastest stellar object of its kind.

[5] WISE 1534-1043 was first noticed by Dan Caselden, a security engineer[6] and citizen scientist of the Backyard Worlds Zooniverse project.

[7] Subsequent observations with the Hubble Space Telescope WFC3 and Keck MOSFIRE uncovered the faintness of the source in the J-band.

[1] The parallax measurement for WISE 1534–1043 showed a distance of 16 parsec, resulting in a faint absolute ch2 magnitude and therefore a low temperature.

New spectroscopic models for metal-poor brown dwarfs, resulted in a temperature lower than 500 K (<227 °C), making WISE 1534–1043 a Y-dwarf.

Methane absorbs around the wavelength of 3.6 μm, corresponding to the W1 (WISE) and ch1 (Spitzer) bands, causing a red color for T and Y-dwarfs.

[1] The low amount of carbon in WISE 1534–1043 causes the atmosphere to contain less methane and explains the moderate red ch1-ch2 color.

[10] (μm) (Vega magnitude) Previous alternative explanations included an extremely low-mass and young brown dwarf.

Microlensing surveys have shown that ejected exoplanets with such high masses are extremely rare and it is unlikely to find any in the neighbourhood of the Sun.