DEN 0255-4700

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DENIS 0255-4700
Artist's impression of an L-dwarf
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 02h 55m 03.579s[1]
Declination −47° 00′ 50.99″[1]
Spectral type L8/L9[2]
Apparent magnitude (V) ~22.9[1]
Apparent magnitude (R) ~20.1[1]
Apparent magnitude (I) ~17.2[1]
Apparent magnitude (J) ~13.2[1]
Proper motion (μ) RA: 1053 ± 11[1] mas/yr
Dec.: −547 ± 6[1] mas/yr
Parallax (π) 201.37 ± 3.89[3] mas
Distance 16.2 ± 0.3 ly
(4.97 ± 0.10 pc)
Absolute magnitude (MV) 24.44
Mass 0.025–0.065[2] M
Radius 0.08–0.1[2] R
Temperature ~1300[2] K
Age 0.3–10 Gya[2] years
Other designations
2MUCD 10158,
DENIS-P J025503.3-470049,
2MASS J02550357-4700509,
DENIS-P J025503.5-470050,
DENIS-P J0255.0-4700,
2MASSI 0255035-470050
Database references

DENIS 0255-4700 is an extremely faint brown dwarf approximately 16 light years from the Solar System in the southern constellation of Eridanus.[1][4] It is the closest known isolated L brown dwarf, and only after the binary Luhman 16. It is also the faintest brown dwarf (with the absolute magnitude of MV=24.44) having measured visible magnitude.[3]

History of observations[edit]

DENIS 0255-4700 was identified for the first time as a probable nearby object in 1999.[4] Its proximity to the Solar System was established by the RECONS group in 2006 when its trigonometric parallax was measured.[3] DENIS 0255-4700 has a relatively small tangential velocity of 27.0 ± 0.5 km/s.[2]


The photospheric temperature of DENIS 0255-4700 is estimated at about 1300 K.[2] Its atmosphere in addition to hydrogen and helium contains water vapor, methane and possibly ammonia.[5] The mass of DENIS 0255-4700 lies in the range from 25 to 65 Jupiter masses corresponding to the age range from 0.3 to 10 billion years.[2]

See also[edit]


  1. ^ a b c d e f g h i "2MUCD 10158 – Brown Dwarf (M<0.08 M)". Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-14. 
  2. ^ a b c d e f g h Stephens, D. C.; Leggett, S. K.; Cushing, M. C.; Marley, M. S.; Saumon, D.; Geballe, T. R.; Golimowski, D. A.; Fan, X.; Noll, K. S. (2009). "The 0.8–14.5 μm Spectra of Mid-L to Mid-T Dwarfs: Diagnostics of Effective Temperature, Grain Sedimentation, Gas Transport, and Surface Gravity". The Astrophysical Journal. 702: 154. Bibcode:2009ApJ...702..154S. arXiv:0906.2991Freely accessible. doi:10.1088/0004-637X/702/1/154. 
  3. ^ a b c Costa, E.; Méndez, R. A.; Jao, W. -C.; Henry, T. J.; Subasavage, J. P.; Ianna, P. A. (2006). "The Solar Neighborhood. XVI. Parallaxes from CTIOPI: Final Results from the 1.5 m Telescope Program". The Astronomical Journal. 132 (3): 1234. Bibcode:2006AJ....132.1234C. doi:10.1086/505706. 
  4. ^ a b "Discovery of the Nearest L Dwarf: the Intrinsically Faintest Object at Visual Wavelengths Known Beyond our Solar System". RECONS. Retrieved 2007-06-17. 
  5. ^ Cushing, Michael C. (2006). "Spitzer Space Telescope Observations of M, L, and T Dwarfs". ASP Conference Series. 357: 66–67. Bibcode:2006ASPC..357...66C. 


External links[edit]