Temperature
3710 K
3564 to 3912.5
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Stellar HostProfile
GJ 229
M1.5V • 5.76 pc
Records
13
literature rows
Planets
2
system count
References
14
distinct source labels
HIP: HIP 29295TIC: TIC 124279525HD: HD 42581
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: Turnbull 2015 • System source: TICv8
Mass
0.48 Msun
0.48 to 0.58
Radius
0.46 Rsun
0.46 to 0.55
Luminosity
-1.22 log(Lsun)
-1.55 to -1.22
Distance
5.76 pc
single adopted value
Spectral Type
M1.5V
Multiple classifications reported
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.46 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
GJ 229
0.46 R☉
System Layout
Known planets
2 planets linked to this host
GJ 229 A c
Radial Velocity
◌
Discovery
2020
Period
121.9 days
Radius
—
Mass
8.58 M⊕
Eq. Temp
—
GJ 229 b
Radial Velocity
◌
Discovery
2014
Period
579.5 days
Radius
—
Mass
14.94 M⊕
Eq. Temp
—
GJ 229: A Nearby Red Dwarf and Its Two Known Worlds
GJ 229 is an M1.5V star, a small, cool red dwarf, located 18.8 light-years from Earth. Its reported mass is 0.48 solar masses and its reported radius is 0.46 solar radii, both smaller than the Sun's corresponding values. Its reported temperature of 3710 K is cooler than the Sun's. Two planets have been reported orbiting this host.
Both planets were found using the radial velocity method, which detects the wobble a planet's gravity induces in its star's motion. GJ 229 A c was discovered in 2020. Its minimum mass is 8.58 Earth masses, and its orbital period is 122 days. GJ 229 b was discovered in 2014, with a minimum mass of 14.9 Earth masses and an orbital period of 579 days. Each planet's minimum mass is larger than Earth's. Among the listed planets, GJ 229 A c has the shortest orbital period and the smallest minimum mass, while GJ 229 b has the longest orbital period and the largest minimum mass.
Provenance
Underlying measurements and references
Evidence Summary
Rows
13
Stellar refs
13
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3564 | 0.58 | — | — | -1.55 | M1/M2 V | 5.76 | Tuomi et al. 2014 | TICv8 |
| — | — | — | — | — | M1/2 V | 5.76 | Michigan Catalog, Vol. 4 | TICv8 |
| — | — | — | — | — | — | 5.76 | Nidever et al. 2002 | TICv8 |
| — | 0.58 | — | — | — | — | 5.76 | Feng et al. 2020 | TICv8 |
| — | — | — | — | — | — | 5.76 | Wright et al. 2004 | TICv8 |
| — | — | 0.46 | 0.40 | — | — | 5.76 | Takeda et al. 2007 | TICv8 |
| 3912.5 | — | — | — | — | — | 5.76 | Gaia DR2 | TICv8 |
| — | — | — | — | — | M0.5 | 5.76 | Hawley et al. 1996 | TICv8 |
| — | — | — | — | — | — | 5.76 | Nordstrom et al. 2004 | TICv8 |
| — | — | — | — | — | K5 | 5.76 | Cannon & Pickering 1918 | TICv8 |
| 3710 | 0.48 | 0.46 | — | -1.22 | M1.5V | 5.76 | Turnbull 2015 | TICv8 |
| — | 0.51 | — | — | — | — | 5.76 | Feng et al. 2022 | TICv8 |
| — | 0.54 | 0.55 | — | — | — | 5.76 | TICv8 | TICv8 |