VHS 1256-1257

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VHS 1256-1257
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
Spectral type M7.5 ± 0.5[citation needed]
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
Distance41 ± 3 ly
(13 ± 1 pc)
Mass0.07 ± 0.015[citation needed] M
Luminosity-3.14 ± 0.1[clarification needed] L
Surface gravity (log g)5.05 ± 0.1 cm/s[citation needed] cgs
Temperature2,620 ± 140[citation needed] K
Age225 ± 75[citation needed] Myr
Other designations
VHS J125601.92-125723.9, WISE J125601.94-125723.7, 2MASS J12560215-1257217

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]

VHS 1256-1257 b[edit]

The brown 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 close to the minimum mass required for the thermonuclear fusion of deuterium.


  1. ^ a b 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.
  2. ^ "Planet VHS 1256-1257 b".