Temperature
4014 K
3841 to 4014
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Stellar HostProfile
GJ 338 B
M0 V • 6.33 pc
Records
12
literature rows
Planets
1
system count
References
13
distinct source labels
HD: HD 79211TIC: TIC 251078597HIP: HIP 120005
Approximate color
from effective temperature
Canonical Summary
Adopted host values from one source row
Values come from the row with the most populated summary measurements. Missing values stay missing. Ranges and counts describe all source rows.
Stellar source: DiTomasso et al. 2023 • System source: TICv8
Mass
0.64 Msun
0.55 to 0.64
Radius
0.58 Rsun
0.53 to 0.59
Age
4 Gyr
0.40 to 4
Luminosity
-1.10 log(Lsun)
-1.12 to -1.10
Distance
6.33 pc
single adopted value
Spectral Type
M0 V
Multiple classifications reported
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.58 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
GJ 338 B
0.58 R☉
System Layout
Known planets
1 planets linked to this host
GJ 338 B b
Radial Velocity
◌
Discovery
2020
Period
24.42 days
Radius
—
Mass
10.60 M⊕
Eq. Temp
—
GJ 338 B b: A Nearby Planet Orbiting a Cool Dwarf
GJ 338 B is a small, cool red dwarf of spectral type M0 V located 20.7 light-years away. Its reported mass estimate is 0.64 solar masses, its radius is 0.58 solar radii, and its temperature is 4010 K, all smaller or cooler than the Sun's corresponding values. The star is estimated to be 4 billion years old. One planet has been found orbiting this host.
That planet, GJ 338 B b, was discovered in 2020 using the radial velocity method, which detects the wobble a planet's gravity induces in its star's motion. Its minimum mass is 10.6 Earth masses, a lower bound on its true mass, and its orbital period is 24.4 days. That minimum mass is larger than Earth's.
Provenance
Underlying measurements and references
Evidence Summary
Rows
12
Stellar refs
12
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agedisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitystable
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 4014 | 0.64 | 0.58 | 4 | -1.10 | M0 V | 6.33 | DiTomasso et al. 2023 | TICv8 |
| — | — | — | — | — | — | 6.33 | Duncan et al. 1991 | TICv8 |
| — | 0.58 | 0.59 | — | — | — | 6.33 | TICv8 | TICv8 |
| — | 0.55 | 0.53 | 0.40 | — | — | 6.33 | Takeda et al. 2007 | TICv8 |
| 3995.0 | — | 0.57 | — | -1.12 | — | 6.33 | Gaia DR2 | TICv8 |
| 3841 | 0.55 | 0.53 | — | -1.10 | K7.0V | 6.33 | Turnbull 2015 | TICv8 |
| — | — | — | — | — | — | 6.33 | Pizzolato et al. 2003 | TICv8 |
| — | — | — | — | — | — | 6.33 | Nidever et al. 2002 | TICv8 |
| 4005 | 0.64 | 0.58 | 4 | -1.10 | M0.0 V | 6.33 | González-Álvarez et al. 2020 | TICv8 |
| — | — | — | — | — | K2 | 6.33 | Cannon & Pickering 1918 | TICv8 |
| — | — | — | — | — | — | 6.33 | Wright et al. 2004 | TICv8 |
| — | — | — | — | — | — | 6.33 | Nordstrom et al. 2004 | TICv8 |