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]:{{{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 | |
| 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]
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.[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
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
Notes
External links
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