DEN 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] |
Characteristics | |
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] |
Astrometry | |
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 |
Details | |
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 | |
SIMBAD | data |
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
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]
Distance
DEN 0255-4700 distance estimates
Source | Parallax, mas | Distance, pc | Distance, ly | Distance, Pm | Ref. |
---|---|---|---|---|---|
Costa et al. (2006) | 201.37±3.89 | 4.97+0.1 −0.09 |
16.2+0.32 −0.31 |
153.2+3 −2.9 |
[3] |
RECONS TOP100 (2012) | 201.37±3.89[nb 1] | 4.97+0.1 −0.09 |
16.2+0.32 −0.31 |
153.2+3 −2.9 |
[5] |
Non-trigonometric distance estimates are marked in italic. The most precise estimate is marked in bold.
Properties
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.[6] 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
- List of nearest stars
- List of brown dwarfs
- Research Consortium on Nearby Stars
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 "2MUCD 10158 – Brown Dwarf (M<0.08 M☉)". Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-14.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 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. arXiv:0906.2991. Bibcode:2009ApJ...702..154S. doi:10.1088/0004-637X/702/1/154.
- ↑ 3.0 3.1 3.2 3.3 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.
- ↑ 4.0 4.1 "Discovery of the Nearest L Dwarf: the Intrinsically Faintest Object at Visual Wavelengths Known Beyond our Solar System". RECONS. Retrieved 2007-06-17.
- ↑ "RECONS TOP100". THE ONE HUNDRED NEAREST STAR SYSTEMS brought to you by RECONS (Research Consortium On Nearby Stars). 2012.
- ↑ Cushing, Michael C. (2006). "Spitzer Space Telescope Observations of M, L, and T Dwarfs". ASP Conference Series 357: 66–67. Bibcode:2006ASPC..357...66C.
Notes
- ↑ Parallax from Costa et al. (2006). RECONS TOP100 list refers to Costa et al. (2005) (TSN-14), but actually this parallax is from Costa et al. (2006) (TSN-16). In Costa et al. (2005) DEN 0255-4700 is not mentioned.
External links
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