VHS J1256−1257
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Corvus |
| Right ascension | 12h 56m 02.1337s |
| Declination | −12° 57′ 21.924″ |
| Apparent magnitude (V) | 17.759 ± 0.059 |
| Characteristics | |
| VHS J1256−1257AB | |
| Spectral type | M7.5 ± 0.5 |
| VHS J1256−1257 b | |
| Spectral type | L7.0 ± 1.5 |
| Apparent magnitude (J) | 16.662 ± 0.287 |
| Apparent magnitude (H) | 15.595 ± 0.209 |
| Apparent magnitude (K) | 14.568 ± 0.121 |
| Astrometry | |
| Radial velocity (Rv) | −1.4 ± 4.5 km/s |
| Proper motion (μ) | RA: −272.462 mas/yr Dec.: −190.239 mas/yr |
| Parallax (π) | 47.2733±0.4731 mas |
| Distance | 69.0 ± 0.7 ly (21.2 ± 0.2 pc) |
| Details | |
| VHS J1256−1257 AB | |
| Mass | 94+10 −11 MJup |
| Luminosity (bolometric) | 0.0011±0.0002 (10−2.95 ± 0.07) L☉ |
| Temperature | 2620±140 K |
| Rotation | 2.0782±0.0004 (A) 2.1342±0.0003 (B) |
| Rotational velocity (v sin i) | 75.2+2.7 −2.3 km/s |
| Age | 140±20 Myr |
| VHS J1256−1257 b | |
| Mass | 19±5 MJup |
| Radius | 1.13–1.21 RJup |
| Luminosity (bolometric) | 10−4.54 ± 0.07 L☉ |
| Surface gravity (log g) | 4.55+0.15 −0.11 cgs |
| Temperature | 1240±50 K |
| Rotation | 22.04±0.05 h |
| Rotational velocity (v sin i) | 13.5+3.6 −4.1 km/s |
| Age | 140±20 Myr |
| Orbit | |
| Primary | VHS J1256−1257 A |
| Companion | VHS J1256−1257 B |
| Period (P) | 7.31±0.02 yr |
| Semi-major axis (a) | 1.96±0.03 AU |
| Eccentricity (e) | 0.8826+0.0025 −0.0024 |
| Inclination (i) | 118.7±1.0° |
| Longitude of the node (Ω) | 4.4±0.5° |
| Periastron epoch (T) | 2021.537+0.015 −0.014 |
| Argument of periastron (ω) (secondary) | 44.9±1.0° |
| Position (relative to VHS J1256−1257AB) | |
| Component | VHS J1256−1257 b |
| Epoch of observation | MJD 55743.067635 (1 July 2011) |
| Angular distance | 8.06 ± 0.03″ |
| Position angle | 218.1 ± 0.2° |
| Projected separation | 102 ± 9 AU |
| Other designations | |
| VHS J1256−1257AB: GJ 11870(A),11871(B),2MASS J12560215−1257217, TIC 2470992, SIPS J1256−1257, WDS J12560-1257A, WISE J125601.94−125723.7 | |
| VHS J1256−1257 b: GJ 11869,2MASS J12560183−1257276, TIC 2470993, WDS J12560-1257B, WISEA J125601.66−125728.7 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
VHS J125601.92−125723.9 (abbreviated to VHS J1256−1257) is a young triple brown dwarf system located in the constellation Corvus approximately 69.0 light-years (21.2 parsecs) from the Sun. The system consists of the equal-mass binary VHS J1256−1257AB and the distant planetary-mass companion VHS 1256−1257 b. In 2022, a continuous radio emission from the radiation belts surrounding VHS J1256−1257 was detected.