2MASS J00361617+1821104

2MASS J00361617+1821104 (abbreviated to 2MASS 0036+1821) is a brown dwarf, located in 28.6 light-years from Earth in the constellation Pisces. It was discovered in 2000 by I. Neill Reid et al. Kinematically, it does not belong to any known moving group, been grouped with other "field stars".^[5]

2MASS J00361617+1821104

2MASS J0036+1821 Credit: legacy surveys
Observation data Epoch J2000      Equinox J2000
Constellation	Pisces
Right ascension	00h 36m 16.112s[1]
Declination	18° 21′ 10.29″[1]
Apparent magnitude (V)	21.33±0.06[2]
Characteristics
Evolutionary stage	Brown dwarf[2]
Spectral type	L3.5[2]
Apparent magnitude (J)	12.44[2]
Apparent magnitude (H)	11.58[2]
Apparent magnitude (K)	11.03[2]
B−V color index	1.7±0.2[2]
Astrometry
Radial velocity (Rv)	21.7±3.0[2] km/s
Proper motion (μ)	RA: 901.582 mas/yr[1] Dec.: 124.354 mas/yr[1]
Parallax (π)	114.4735±0.1381 mas[1]
Distance	28.49 ± 0.03 ly (8.74 ± 0.01 pc)
Details
Radius	1.01±0.07[3] RJup
Temperature	1300–2000[citation needed] K
Rotation	3.08±0.05 h[4]
Other designations
LSPM J0036+1821, 2MASS J00361617+1821104
Database references
SIMBAD	data

2MASS 0036+1821 is of spectral type L3.5, the surface temperature is 1300-2000 Kelvin. As with other brown dwarfs of spectral type L, its spectrum is dominated of metal hydrides and alkali metals. Its position shifts due to its proper motion by 0.9071 arcseconds per year.

The surface of 2MASS 0036+1821 is completely covered by clouds, although cloud deck appear to be thin (less than ten optical depths)^[4] Because of unusually rapid rotation, it is possessing a strong magnetic field over 1000 G at the photosphere level,^[6] and is well known for its radio emissions.^[7]

2MASS 0036+1821 is likely a binary separated by 0.4 astronomical units. Assuming an age of 0.5-5 Billion years, the A component has a mass estimate of 51-76 M_J and the B component has a mass estimate of 47-74 M_J.^[8]

See also

• List of star systems within 25–30 light-years