Planet VHS 1256-1257 (AB)b

Detailed information about planet VHS 1256-1257 (AB)b and its parameters.

Planet

Name
VHS 1256-1257 (AB)b
Mass
Mass*sin(i)
Semi-Major Axis
Orbital Period
Eccentricity
ω
Tperi
Radius
Inclination
Primary transit
Secondary transit
λ
Impact Parameter b
Time Vr=0
Velocity Semiamplitude K
Calculated temperature
Measured temperature
Hottest point longitude
Surface gravity log(g/gH)
Data Source Type Result Value Result Figure Notes Reference
Molecule Data Source Type Result Value Result Figure Notes Reference
C
Measurements Detected 2023 - GANDHI S.
CH4
Measurements Detected 2024 - PETRUS S.
Measurements Detected 2023 - MILES B.
CO
Measurements Detected 2024 - PETRUS S.
Measurements Detected 2023 - MILES B.
CO2
Measurements Detected 2023 - MILES B.
H2O
Measurements Detected 2023 - MILES B.
K
Measurements Detected 2023 - MILES B.
Na
Measurements Detected 2023 - MILES B.
O
Measurements Detected 2023 - GANDHI S.

Poon et al. (2024): The planet shows tilted rotation axis like Solar planet Uranus (ip = 90 ± 18°). Spectral type L7.

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Star

Name
VHS 1256-1257 (AB)
Distance
Spectral type
M7.5V+M7.5V
Apparent magnitude V
17.8
Apparent magnitude I
Apparent magnitude J
Apparent magnitude H
Apparent magnitude K
Mass
Age
Effective temperature
Radius
0.16 RSun
Metallicity [Fe/H]
Detected Disc
Magnetic Field
RA2000
12:56:02.0
Dec2000
-12:57:24.0
Alternate Names
VHS J125601.92-125723.9

Rich et al. (2016): The central star is a binary, whose components are nearly equal in brightness and separated by 0.106" +/- 0.001" (i.e. 1.96 AUs) and trace a highly eccentric orbit (e = 0.88).

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