Wolf 1130
unWISE image of the triple Wolf 1130 AB (center) and C (lower left in the yellow circle) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Wolf 1130 AB | |
| Right ascension | 20h 05m 02.1951s |
| Declination | +54° 26′ 03.234″ |
| Apparent magnitude (V) | 13.883±0.007 |
| Wolf 1130 C | |
| Right ascension | 20h 05m 20.7785s |
| Declination | +54° 24′ 43.274″ |
| Characteristics | |
| Wolf 1130 AB | |
| Evolutionary stage | subdwarf + white dwarf |
| Spectral type | M3+WD |
| Variable type | Flare star |
| Wolf 1130 C | |
| Evolutionary stage | brown dwarf |
| Spectral type | (e)sdT6: |
| Astrometry | |
| Wolf 1130AB | |
| Proper motion (μ) | RA: −1,159.524 mas/yr Dec.: −904.008 mas/yr |
| Parallax (π) | 60.2958±0.0266 mas |
| Distance | 54.09 ± 0.02 ly (16.585 ± 0.007 pc) |
| Absolute magnitude (MV) | 10.99 |
| Wolf 1130C | |
| Proper motion (μ) | RA: −1,156.2 mas/yr Dec.: −904.4 mas/yr |
| Parallax (π) | 53.9±2.7 mas |
| Distance | 61 ± 3 ly (18.6 ± 0.9 pc) |
| Orbit | |
| Primary | Wolf 1130A |
| Name | Wolf 1130B |
| Period (P) | 0.497±0.003 d |
| Semi-major axis (a) | ca. 3 R☉ |
| Eccentricity (e) | 0.011±0.003 |
| Inclination (i) | 29±3° |
| Longitude of the node (Ω) | 210±19° |
| Details | |
| A | |
| Mass | 0.26 M☉ |
| Radius | 0.33 R☉ |
| Surface gravity (log g) | 4.9 cgs |
| Temperature | 3,530±60 K |
| Metallicity [Fe/H] | −0.70±0.12 dex |
| B | |
| Mass | 1.24+0.19 −0.15 M☉ |
| Radius | 0.005 R☉ |
| Temperature | <7000 K |
| C | |
| Mass | 44+6 −5 MJup |
| Radius | 0.80±0.02 RJup |
| Luminosity (bolometric) | 10−6.047±0.003 L☉ |
| Surface gravity (log g) | 5.19+0.05 −0.06 cgs |
| Temperature | 621±9 K |
| Metallicity | −0.68±0.04 dex |
| Other designations | |
| HIP 98906, WDS J20050+5426, 2MASS J20050227+5426037, GJ 781, LHS 482, WISEA J200500.79+542553.7, WISE J200520.38+542433.9 | |
| Database references | |
| SIMBAD | Wolf 1130AB |
| Wolf 1130C | |
Wolf 1130 is a nearby pre-cataclysmic triple star system consisting of a cold subdwarf of spectral type sdM3 (A), an ultramassive white dwarf (B) and a cold brown dwarf of spectral type sdT8 (C). Wolf 1130 is 54.1 light-years (16.6 parsecs) distant from earth.
The system is older than 10 billion years based on UVW velocities and the low metallicity of Wolf 1130A. This makes Wolf 1130C one of the oldest brown dwarfs known to science, together with LSPM J0055+5948B, which has a similar age. There might be older brown dwarfs, such as WISE 1534–1043, which have less well determined ages.