ULAS J003402.77−005206.7

ULAS J003402.77−005206.7 (also ULAS J0034−00) is a T9-type^[4] brown dwarf in the constellation of Cetus.^[1]

ULAS J003402.77−005206.7

ULAS J0034−00 (red object in the center) Credit: legacy surveys
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Cetus
Right ascension	00h 34m 02.771s[1]
Declination	−00° 52′ 06.78″[1]
Characteristics
Spectral type	Y0[2]
Astrometry
Parallax (π)	79.6±3.8 mas[3]
Distance	41 ± 2 ly (12.6 ± 0.6 pc)
Details[2]
Mass	0.005–0.019 M☉
Surface gravity (log g)	4.0–4.5 cgs
Temperature	550–600 K
Age	0.1–2.0 Gyr
Database references
SIMBAD	data
Other designations
ULAS J003402.77−005206.7 ULAS J0034−00

ULAS J0034−00 is one of the coolest brown dwarfs known. It was first identified in data from the UK Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS). Infrared spectra subsequently taken with the IRS instrument on the Spitzer Space Telescope give an estimated effective temperature of between 550 and 600 K and does not emit any visible light. Its mass is estimated at between 5 and 20 Jupiter masses and its age at between 0.1 and 2.0 billion years.^[2]