ULAS J133553.45+113005.2

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ULAS J133553.45+113005.2
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Virgo
Right ascension 13h 35m 53.45s[1]
Declination +11° 30′ 05.2″[1]
Spectral type T9[1]
Distance26–40[2] ly
(8–12[2] pc)
Mass0.014–0.030[2] M
Temperature500–550[3] K
Age0.6–5.3[2] Gyr
Database references

ULAS J133553.45+113005.2 (also called ULAS1335) is a T-type brown dwarf in the constellation of Virgo.[1] It was discovered in data from the UK Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS). Its discovery was reported June 2008.[2]

After identification, ULAS1335 was imaged using the UFTI camera on the UKIRT, on Mauna Kea, Hawaii, to confirm its photometric properties and location. It was spectroscopically confirmed as a T9 dwarf using the Gemini North telescope, also at Mauna Kea, and was imaged using IRAC on the Spitzer Space Telescope. The IRAC imaging confirmed it as the reddest (in near-to-mid infrared colors) T dwarf yet discovered, and by inference the coolest.[2]

ULAS1334 was initially estimated to have a temperature around 550–600 K, a distance of 8–12 parsecs (26–40 light years), and a mass of 15–31 Jupiter masses.[2] More recent spectroscopic observations, using IRS on the Spitzer Space Telescope, give an effective temperature of 500–550 K.[3] Since these temperature estimates are based on model comparisons, they should be treated with caution until the parallax of this object has been measured.[2]


  1. ^ a b c d ULAS J133553.45+113005.2 -- Brown Dwarf (M<0.08solMass), database entry, SIMBAD. Accessed on line June 24, 2009.
  2. ^ a b c d e f g h Exploring the substellar temperature regime down to ~550K, Ben Burningham et al., Monthly Notices of the Royal Astronomical Society 391, #1 (November 2008), pp. 320–333, doi:10.1111/j.1365-2966.2008.13885.x, Bibcode:2008MNRAS.391..320B. The arXiv e-print of this paper, arXiv:0806.0067, was first submitted June 2, 2008.
  3. ^ a b 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, Bibcode:2009ApJ...695.1517L.