ULAS J003402.77−005206.7

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ULAS J003402.77-005206.7
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cetus
Right ascension  00h 34m 02.771s[1]
Declination −00° 52′ 06.78″[1]
Spectral type Y0[2]
Parallax (π)79.6 ± 3.8[3] mas
Distance41 ± 2 ly
(12.6 ± 0.6 pc)
Mass0.005–0.019 M
Surface gravity (log g)4.0–4.5 cgs
Temperature550–600 K
Age0.1–2.0 Gyr
Database references
Other designations
ULAS J003402.77-005206.7
ULAS J0034-00

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

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]


  1. ^ a b c CFBDS J003402.77-005206.7 -- Brown Dwarf (M<0.08solMass), database entry, SIMBAD. Accessed on line June 24, 2009.
  2. ^ a b c The Physical Properties of Four ~600 K T Dwarfs, S. K. Leggett et al., The Astrophysical Journal 695, #2 (April 2009), pp. 1517–1526, doi:10.1088/0004-637X/695/2/1517, Bibcode2009ApJ...695.1517L.
  3. ^ Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J.; Anglada-Escud, Guillem (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". The Astrophysical Journal. 752 (1): 56. arXiv:1203.5543. Bibcode:2012ApJ...752...56F. doi:10.1088/0004-637X/752/1/56.