2MASS J15031961+2525196

2MASS J15031961+2525196 (2MASS 1503+2525) is a nearby brown dwarf of spectral type T5.5,^[6] located in the constellation of Boötes at approximately 20.7 light-years from Earth.^[7] It was discovered in 2003 by Adam J. Burgasser et al. in wide-field search for T dwarfs using the Two Micron All Sky Survey (2MASS).

2MASS J15031961+2525196

2MASS 1503+2525 Location of 2MASS 1503+2525 in the constellation Boötes
Observation data Epoch J2000      Equinox J2000
Constellation	Boötes[1]
Right ascension	15h 03m 19.613s[2]
Declination	+25° 25′ 19.68″[2]
Characteristics
Spectral type	T5[3]
Astrometry
Radial velocity (Rv)	33±14[4] km/s
Proper motion (μ)	RA: 87.414±0.613[5] mas/yr Dec.: 557.780±0.695[5] mas/yr
Parallax (π)	155.7758±0.7557 mas[5]
Distance	20.9 ± 0.1 ly (6.42 ± 0.03 pc)
Other designations
Gaia DR2 1267906854386665088, 2MASS J15031961+2525196, SDSS J150319.64+252522.4[2]
Database references
SIMBAD	data

The brown dwarf 2MASS 1503+2525 is marked with a white arrow. The image also shows the star EX Boötis and a galaxy group. (Credit: legacy surveys)

Originally the most precise distance estimate of 2MASS 1503+2525 is a trigonometric parallax, published by Dupuy and Liu in 2012: 157.2 ± 2.2 mas, corresponding to a distance 6.36 ± 0.09 pc, or 20.7 ± 0.3 ly.^[7] The parallax was further refined by Gaia mission in 2018 to 154.9208±1.1025mas. The brown dwarf 2MASS 1503+2525 lies in a local void 6.5 parsecs across, where relatively few stars and brown dwarfs are located.^[8]

The 2MASS J15031961+2525196 is the spectral standard of the spectral class T5.^[9]