Temperature
3717 K
3717 to 4056.8
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Stellar HostProfile
GJ 3138
M0 • 28.47 pc
Records
6
literature rows
Planets
3
system count
References
7
distinct source labels
HIP: HIP 10037TIC: TIC 632528291
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: Astudillo-Defru et al. 2017 • System source: TICv8
Mass
0.68 Msun
0.55 to 0.68
Radius
0.50 Rsun
0.50 to 0.67
Luminosity
-1.35 log(Lsun)
-1.35 to -1
Distance
28.47 pc
single adopted value
Spectral Type
M0
Multiple classifications reported
Planets
3
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.50 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
GJ 3138
0.50 R☉
System Layout
Known planets
3 planets linked to this host
GJ 3138: A Cool Dwarf and Its Three Planets
GJ 3138 is an M0 star located 92.9 light-years away. As an M-type dwarf, it is a small, cool red dwarf. Its spectral class places it below the Sun in temperature, and the reported measurements bear this out: the star has a mass of 0.681 solar masses, a radius of 0.5 solar radii, and a temperature of 3720 K. The star's reported mass and radius are smaller than the Sun's, and its reported temperature is cooler than the Sun's. Three planets have been found orbiting this star.
GJ 3138 b was discovered by the radial velocity method in 2017. That method detects the wobble a planet's gravity induces in its star's motion; repeated wobbles reveal the planet and its orbital period. GJ 3138 b has a minimum mass of 1.78 Earth masses and an orbital period of 1.22 days. Among the listed planets, it has the smallest minimum mass and the shortest year. GJ 3138 c was also discovered by radial velocity in 2017. It has a minimum mass of 4.18 Earth masses and an orbital period of 5.97 days. Among the listed planets, it has the second-smallest minimum mass and the second-shortest year.
GJ 3138 d was likewise found by radial velocity in 2017. It has a minimum mass of 10.5 Earth masses and an orbital period of 258 days. Among the listed planets, it has the largest minimum mass and the longest year.
The minimum mass of each of these planets is larger than Earth's. For all three planets, the minimum mass is a lower bound on the true mass rather than an exact figure.
Provenance
Underlying measurements and references
Evidence Summary
Rows
6
Stellar refs
6
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitystable
Metallicitystable
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3717 | 0.68 | 0.50 | — | -1.35 | M0 | 28.47 | Astudillo-Defru et al. 2017 | TICv8 |
| 3916 | 0.55 | 0.67 | — | -1 | K7 | 28.47 | Turnbull 2015 | TICv8 |
| — | — | — | — | — | K9 V (k) | 28.47 | Gray et al. 2006 | TICv8 |
| 4056.8 | — | 0.58 | — | -1.09 | — | 28.47 | Gaia DR2 | TICv8 |
| — | — | — | — | — | M0 | 28.47 | Hawley et al. 1996 | TICv8 |
| 3953 | 0.62 | 0.63 | — | -1.06 | — | 28.47 | TICv8 | TICv8 |