WISE 0825+2805

WISE 0825+2805 (WISE J082507.35+280548.5) is a brown dwarf with a spectral type of Y0.5.^[3] It is about 21.4 light-years away from Earth in the Cancer constellation.^[5]

WISE 0825+2805

WISE 0825+2805 Credit: JWST/MIRI; Faherty et al.
Observation data Epoch 2000      Equinox 2000
Constellation	Cancer[1]
Right ascension	08h 25m 07.35720s[2]
Declination	+28° 05′ 48.5592″[2]
Characteristics
Evolutionary stage	brown dwarf
Spectral type	Y0.5[3]
Apparent magnitude (J)	22.53±0.10
Apparent magnitude (H)	23.09±0.18
Astrometry
Proper motion (μ)	RA: −66.7±0.9 mas/yr[2] Dec.: −235.8±0.9 mas/yr[2]
Parallax (π)	152.6±2 mas[2]
Distance	21.4 ± 0.3 ly (6.55 ± 0.09 pc)
Details[4]
Mass	5 MJup
Surface gravity (log g)	4 cgs
Temperature	350 K
Age	800 Myr
Other designations
WISEA J082507.37+280548.2, WISE J082507.35+280548.5
Database references
SIMBAD	data

Discovery

WISE 0825+2805 was discovered in 2015 by Schneider et al. with the Wide-field Infrared Survey Explorer and the Hubble Space Telescope, using WFC3 near-infrared grism spectroscopy. The team also announced the discovery of three T-dwarfs as well as two additional Y-dwarfs (WISE J1206+8401 and WISE J2354+0240) in the same paper.^[3]

Physical properties

WISE 0825+2805 was observed with JWST NIRCam and MIRI. The modeling requires phosphine-free and diabatic models to produce a good fit. The good fit requires an effective temperature of 350 Kelvin and a surface gravity of log g = 4.0. Alternatively a lower surface gravity could improve the fit. The model parameters correspond to a mass of 5 M_J and an age of 800 Myrs.^[4]

See also

• List of Y-dwarfs
• List of star systems within 20–25 light-years