VHS 1256-1257
VHS J125601.92-125723.9 (abbreviated as VHS 1256-1257 or HSV 1 256) is a red dwarf of spectral type M7.5 located approximately 13 parsecs from the sun, which was discovered by a team led by the Polish astronomer Bartosz Gauza. It is the central object of a planetary system with one known confirmed planet, VHS 1256-1257 b.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Corvus |
| Right ascension | 12h 56m 02.0s |
| Declination | −12° 57′ 24″ |
| Apparent magnitude (V) | 17.759 ± 0.059 |
| Characteristics | |
| Spectral type | M7.5 ± 0.5 |
| Astrometry | |
| Radial velocity (Rv) | -1.4 ± 4.5 km/s |
| Proper motion (μ) | RA: -281.5 ± 5.3 mas/yr Dec.: -205.5 ± 15.2 mas/yr |
| Parallax (π) | 78.79 ± 6.4[1] mas |
| Distance | 41 ± 3 ly (13 ± 1 pc) |
| Details | |
| Mass | 0.07 ± 0.015 M☉ |
| Luminosity | -3.14 ± 0.1 L☉ |
| Surface gravity (log g) | 5.05 ± 0.1 cm/s cgs |
| Temperature | 2,620 ± 140 K |
| Age | 225 ± 75 Myr |
| Other designations | |
VHS J125601.92-125723.9, WISE J125601.94-125723.7, 2MASS J12560215-1257217 | |
VHS 1256-1257 b
The red dwarf's only discovered companion planet was first identified and documented by the 2MASS survey in 2015. It orbits at a distance of 102 ± 9 AU and has an estimated mass of approximately 11 times Jupiter's,[1] which is below the minimum mass required for the thermonuclear fusion of deuterium.
References
- Gauza, Bartosz; Béjar, Victor J. S.; Pérez-Garrido, Antonio; Maria Rosa Zapatero Osorio; Lodieu, Nicolas; Rebolo, Rafael; Pallé, Enric; Nowak, Grzegorz (2015). "Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9". The Astrophysical Journal. 804 (2): 96. arXiv:1505.00806. Bibcode:2015ApJ...804...96G. doi:10.1088/0004-637X/804/2/96.
- "Planet VHS 1256-1257 b".
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