Planet GJ 229 Ba
Detailed information about planet GJ 229 Ba and its parameters.
Planet
- Name
- GJ 229 Ba
- Planet Status
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- Discovered in
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- Update
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- Mass
- Mass*sin(i)
- Semi-Major Axis
- Orbital Period
- Eccentricity
- ω
- Tperi
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- Radius
- Inclination
- Detection Method
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- Mass Meas. Method
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- Radius Meas. Method
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- Primary transit
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- Secondary transit
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- λ
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- Impact Parameter b
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- Time Vr=0
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- Velocity Semiamplitude K
- Calculated temperature
- Measured temperature
- Hottest point longitude
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- Geometric albedo
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- Surface gravity log(g/gH)
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- Alternate Names
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Data Source | Type | Result Value | Result Figure | Notes | Reference |
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Molecule | Data Source | Type | Result Value | Result Figure | Notes | Reference |
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CH4 | ||||||
Modeling | Detected | 2022 - HOWE A.R. | ||||
CO | ||||||
Modeling | Detected | 2022 - HOWE A.R. | ||||
CO2 | ||||||
Modeling | Detected | 2022 - HOWE A.R. | ||||
H2O | ||||||
Modeling | Detected | 2022 - HOWE A.R. | ||||
H2S | ||||||
Modeling | Detected | 2022 - HOWE A.R. | ||||
K | ||||||
Modeling | Detected | 2022 - HOWE A.R. | ||||
Na | ||||||
Modeling | Detected | 2022 - HOWE A.R. | ||||
NH3 | ||||||
Modeling | Detected | 2022 - HOWE A.R. |
Feng et al. (2022) list GJ 229 B as "HD 42581 d" following separation order of substellar components. However the more correct designation is "HD 42581 b" according to the chronology of discoveries (1995).
Howe et al. (2022) provide a lower mass estimate (41.6 ± 3.3 MJup for an age > 1 Gyr).
17 Oct. 2024: Brandt et al. (2021) estimated a mass of 71.4 ± 0.6MJup for GJ 229 B also considering a binary nature for the object. Kawashima et al. (2024) provide support to the binary model. Accordingly taking 71.4 ± 0.6MJup as total mass and 1.3 RJup as total radius, GJ 229 B is likely an equal-mass substellar binary of about 36 MJup and 0.92 RJup for each component (for Mb = Ms/2 and Rb = Rs/ √ 2, where Mb and Ms are namely the mass estimate for a binary and a single object as well as Rb and Rs concern the radius estimate for a binary and a single object).
18 Oct. 2024: Gj 229 B is confirmed as binary brown dwarf with individual spectral types close to T7 and T8 respectively.
No link
Star
- Name
- GJ 229
- Distance
- Spectral type
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- Apparent magnitude V
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- Mass
- Age
- Effective temperature
- Radius
- Metallicity [Fe/H]
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- Detected Disc
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- Magnetic Field
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- RA2000
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- Dec2000
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- Alternate Names
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No remarks
No link
- Simbad
- Most recent references (ADS)