DENIS-P J1228.2−1547

DENIS-P J1228.2-1547 is a system of two nearly equal brown dwarfs, both are of spectral types L5.5:,^[4] located in constellation Corvus at approximately 20.2 parsecs or 66.0 light-years from Earth.^[5]

DENIS-P J1228.2-1547

DENIS-P J1228.2−1547 Credit: legacy surveys
Observation data Epoch J2000      Equinox J2000
Constellation	Corvus
Right ascension	12h 28m 15.232s[1]
Declination	−15° 47′ 34.23″[1]
Characteristics
Spectral type	L5.5
Apparent magnitude (J)	14.378[2]
Apparent magnitude (H)	13.35[2]
Apparent magnitude (K)	12.767[2]
Astrometry
Parallax (π)	49.40±1.90 mas[3]
Distance	66 ± 3 ly (20.2 ± 0.8 pc)
Other designations
DENIS J1228.2-1547, 2MASS J12281523-1547342, 2MUCD 11073
Database references
SIMBAD	data

History of observations

DENIS-P J1228.2-1547 is one on the first free-floating L dwarfs discovered. It was discovered in 1997 by Xavier Delfosse and colleagues from the DENIS survey.^[6]

The second component (B) was discovered by Eduardo L. Martín and colleagues using near-infrared camera NICMOS on Hubble Space Telescope. It was announced in 1999.^[7]

See also

The other two free-floating L dwarfs, detected by Delfosse et al. and announced in 1997:^[6]

• Deep Near Infrared Survey of the Southern Sky
• DENIS-P J1058.7-1548
• DENIS-P J020529.0-115925
• DENIS-P J082303.1-491201 b
• DENIS-P J101807.5-285931

A free-floating L dwarf, detected by Kirkpatrick et al., announced also in 1997, but earlier:^[8]

• 2MASP J0345432+254023

A free-floating L dwarf, detected by Ruiz et al., announced also in 1997, but later:^[9]

• Kelu-1