WISE 0350−5658

WISE J035000.32−565830.2 (designation abbreviated to WISE 0350−5658) is a (sub-)brown dwarf of spectral class Y1,^[1] located in constellation Reticulum, the nearest known star/brown dwarf in this constellation. Being approximately 18.5 light-years from Earth,^[2] it is one of the Sun's nearest neighbors.

WISE J035000.32−565830.2

WISE 0350−5658 Location of WISE 0350−5658 in the constellation Reticulum
Observation data Epoch J2000      Equinox J2000
Constellation	Reticulum
Right ascension	03h 50m 00.32s[1]
Declination	−56° 58′ 30.2″[1]
Characteristics
Spectral type	Y1[1]
Apparent magnitude (J (MKO-NIR filter system))	>22.8[1]
Apparent magnitude (H (MKO-NIR filter system))	>21.5[1]
Astrometry
Proper motion (μ)	RA: −208.7±1.0 mas/yr[2] Dec.: −575.4±1.1 mas/yr[2]
Parallax (π)	176.4±2.3 mas[2]
Distance	18.5 ± 0.2 ly (5.67 ± 0.07 pc)
Details
Temperature	388±88[2] K
Other designations
WISE J035000.32−565830.2,[1] WISE 0350−5658[1]
Database references
SIMBAD	data

Discovery

WISE 0350-5658 with unWISE

WISE 0350−5658 was discovered in 2012 by J. Davy Kirkpatrick and colleagues from data collected by the Wide-field Infrared Survey Explorer (WISE) in the infrared at a wavelength of 40 cm (16 in), whose mission lasted from December 2009 to February 2011. In 2012, Kirkpatrick et al. published a paper in The Astrophysical Journal, where they presented the discovery of seven new brown dwarfs of spectral type Y that had been found by WISE, among which was WISE 0350−5658.^[1]

Distance

WISE 0350−5658 is one of the nearest known brown dwarfs: its trigonometric parallax is 0.184 ± 0.010 arcsecond, corresponding to a direct distance of 5.4 pc (17.7 ly).^[3]

Physical properties

WISE 0350−5658 was observed together with WISEP J1738+2732 with the Gemini Observatory. The researchers found that non-equilibrium chemistry models reproduce the spectra of these two brown dwarfs better than equilibrium models. The researchers also found an effective temperature of 350±25 K and surface gravity of log g=4.0±0.25 for WISE 0350−5658. A mass of 7−9 M_J was estimated in this work.^[4] Later work using the Spitzer Space Telescope and J-band photometry found that WISE 0350−5658 has a low tangential velocity, could be metal-rich and also found a similar mass of 3−8 M_J. These properties could be an indicator that it is a young Y-dwarf, and might be a rogue planet.^[5] Another work using Hubble found a slightly higher mass of 7−13 M_J.^[6]

See also

• List of nearest stars and brown dwarfs
• List of Y-dwarfs

The other six discoveries of brown dwarfs, published in Kirkpatrick et al. (2012):^[1]

• WISE 0146+4234 (Y0)
• WISE 0359−5401 (Y0)
• WISE 0535−7500 (≥Y1)
• WISE 0713−2917 (Y0)
• WISE 0734−7157 (Y0)
• WISE 2220−3628 (Y0)