Temperature
4640 K
4571 to 4723
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Stellar HostProfile
GJ 143
K4.5 • 16.32 pc
Records
11
literature rows
Planets
2
system count
References
11
distinct source labels
TIC: TIC 279741379HIP: HIP 16069HD: HD 21749
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: Dragomir et al. 2019 • System source: TICv8
Mass
0.73 Msun
0.68 to 0.76
Radius
0.69 Rsun
0.69 to 0.76
Age
3.80 Gyr
single adopted value
Luminosity
-0.69 log(Lsun)
-0.73 to -0.64
Distance
16.32 pc
single adopted value
Spectral Type
K4.5
Multiple classifications reported
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.69 R☉ • circles scaled linearly by radius
Sun
1.0 R☉ baseline
GJ 143
0.69 R☉
System Layout
Known planets
2 planets linked to this host
GJ 143 b
Transit
◌
Discovery
2019
Period
35.61 days
Radius
2.61 R⊕
Mass
22.70 M⊕
Eq. Temp
422 K
HD 21749 c
Transit
◌
Discovery
2019
Period
7.79 days
Radius
0.89 R⊕
Mass
3.70 M⊕
Eq. Temp
701 K
GJ 143 and Its Two Known Planets
GJ 143 is a K-type star 53.2 light-years from Earth. Its spectral type, K4.5, places it among the cooler, more orange stars. The star has a reported age of 3.8 billion years, a mass of 0.73 solar masses, a radius of 0.695 solar radii, and a temperature of 4640 K. Its mass and radius are smaller than the Sun's, and its temperature is cooler.
Two planets have been reported orbiting this star. GJ 143 b was discovered in 2019 by the transit method. It is a Neptune-like planet with a mass of 22.7 Earth masses and a radius of 2.61 Earth radii, and it orbits every 35.6 days. Its radius and mass are each larger than Earth's, and its mean density is 7.03 g/cm³, 1.28 times Earth's.
HD 21749 c was also discovered in 2019 by the transit method. It is a Sub-Earth planet, meaning its radius is smaller than Earth's; its radius is 0.892 Earth radii. Its mass is a reported upper limit of 3.7 Earth masses. It completes an orbit in 7.79 days. Among the two listed planets, HD 21749 c has the shortest year and the smallest radius, while GJ 143 b has the longest year and the largest radius.
Provenance
Underlying measurements and references
Evidence Summary
Rows
11
Stellar refs
10
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| — | — | — | — | — | K0 | 16.32 | Cannon & Pickering 1918 | TICv8 |
| — | — | — | — | — | K4.5 V | 16.32 | Gray et al. 2006 | TICv8 |
| — | 0.76 | 0.73 | — | -0.71 | — | 16.32 | Trifonov et al. 2019 | TICv8 |
| 4628.5 | — | 0.71 | — | — | — | 16.32 | ExoFOP | TICv8 |
| 4628.5 | 0.73 | 0.71 | — | -0.69 | — | 16.32 | TICv8 | TICv8 |
| 4723 | 0.76 | — | — | -0.73 | — | 16.32 | Sousa et al. 2008 | TICv8 |
| 4640 | 0.73 | 0.69 | 3.80 | -0.69 | K4.5 | 16.32 | Dragomir et al. 2019 | TICv8 |
| 4628.5 | — | 0.71 | — | — | — | 16.32 | ExoFOP | TICv8 |
| 4571 | 0.68 | 0.76 | — | -0.64 | K4V | 16.32 | Turnbull 2015 | TICv8 |
| 4628.5 | — | 0.71 | — | -0.69 | — | 16.32 | Gaia DR2 | TICv8 |
| — | — | — | — | — | K4 V | 16.32 | Michigan Catalog, Vol. 1 | TICv8 |