Location of DENIS 0255−4700 in the constellation
Eridanus | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Eridanus |
Right ascension | 02h 55m 03.693s [1] |
Declination | −47° 00′ 51.36″ [1] |
Characteristics | |
Spectral type | L8/L9 [2] |
Apparent magnitude (V) | ~22.9 [3] |
Apparent magnitude (R) | ~20.1 [3] |
Apparent magnitude (I) | ~17.2 [3] |
Apparent magnitude (J) | ~13.2 [3] |
Astrometry | |
Proper motion (μ) |
RA: 1,012.445
mas/
yr
[1] Dec.: −554.031 mas/ yr [1] |
Parallax (π) | 205.4251 ± 0.1857 mas [1] |
Distance | 15.88 ± 0.01
ly (4.868 ± 0.004 pc) |
Absolute magnitude (MV) | 24.44 |
Details | |
Mass | 0.0578 [4] M☉ |
Radius | 0.0776 [4] R☉ |
Luminosity | 0.0000154 [4] L☉ |
Temperature | ~1300 [2] [4] K |
Rotation | 1.7 hours [5] |
Rotational velocity (v sin i) | 40.8±8.0 [5] km/s |
Age | 0.3–10 [2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
DENIS 0255−4700 is an extremely faint brown dwarf 15.9 light-years (4.9 parsecs) from the Solar System in the southern constellation of Eridanus. [3] [7] It is the closest isolated L-type brown dwarf (no undiscovered L-dwarfs are expected to be closer), 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. [8] A number of nearer T and Y-type dwarfs are known, specifically WISE 0855−0714, Epsilon Indi B and C, SCR 1845-6357 B, and UGPS 0722−05.
DENIS 0255−4700 was identified for the first time as a probable nearby object in 1999. [7] Its proximity to the Solar System was established by the RECONS group in 2006 when its trigonometric parallax was measured. [8] 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 1300 K. [2] Its atmosphere in addition to hydrogen and helium contains water vapor, methane and possibly ammonia. [9] 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] The brown dwarf is rotating rapidly with the period of 1.7 hours, and its rotational axis is inclined 40 degrees from the line-of-sight. [5]
Location of DENIS 0255−4700 in the constellation
Eridanus | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Eridanus |
Right ascension | 02h 55m 03.693s [1] |
Declination | −47° 00′ 51.36″ [1] |
Characteristics | |
Spectral type | L8/L9 [2] |
Apparent magnitude (V) | ~22.9 [3] |
Apparent magnitude (R) | ~20.1 [3] |
Apparent magnitude (I) | ~17.2 [3] |
Apparent magnitude (J) | ~13.2 [3] |
Astrometry | |
Proper motion (μ) |
RA: 1,012.445
mas/
yr
[1] Dec.: −554.031 mas/ yr [1] |
Parallax (π) | 205.4251 ± 0.1857 mas [1] |
Distance | 15.88 ± 0.01
ly (4.868 ± 0.004 pc) |
Absolute magnitude (MV) | 24.44 |
Details | |
Mass | 0.0578 [4] M☉ |
Radius | 0.0776 [4] R☉ |
Luminosity | 0.0000154 [4] L☉ |
Temperature | ~1300 [2] [4] K |
Rotation | 1.7 hours [5] |
Rotational velocity (v sin i) | 40.8±8.0 [5] km/s |
Age | 0.3–10 [2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
DENIS 0255−4700 is an extremely faint brown dwarf 15.9 light-years (4.9 parsecs) from the Solar System in the southern constellation of Eridanus. [3] [7] It is the closest isolated L-type brown dwarf (no undiscovered L-dwarfs are expected to be closer), 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. [8] A number of nearer T and Y-type dwarfs are known, specifically WISE 0855−0714, Epsilon Indi B and C, SCR 1845-6357 B, and UGPS 0722−05.
DENIS 0255−4700 was identified for the first time as a probable nearby object in 1999. [7] Its proximity to the Solar System was established by the RECONS group in 2006 when its trigonometric parallax was measured. [8] 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 1300 K. [2] Its atmosphere in addition to hydrogen and helium contains water vapor, methane and possibly ammonia. [9] 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] The brown dwarf is rotating rapidly with the period of 1.7 hours, and its rotational axis is inclined 40 degrees from the line-of-sight. [5]