Temperature
4965 K
4835 to 5120
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Stellar HostProfile
HD 128311
K0 • 16.33 pc
Records
20
literature rows
Planets
2
system count
References
21
distinct source labels
TIC: TIC 349606708HIP: HIP 71395HD: HD 128311
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
0.83 Msun
0.61 to 0.84
Radius
0.76 Rsun
0.66 to 0.78
Age
6.40 Gyr
0.74 to 6.40
Luminosity
-0.49 log(Lsun)
-0.57 to -0.49
Distance
16.33 pc
single adopted value
Spectral Type
K0
Multiple classifications reported
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.76 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
HD 128311
0.76 R☉
System Layout
Known planets
2 planets linked to this host
HD 128311 b
Radial Velocity
◌
Discovery
2002
Period
453.0 days
Radius
—
Mass
562.2 M⊕
Eq. Temp
—
HD 128311 c
Radial Velocity
◌
Discovery
2005
Period
921.5 days
Radius
—
Mass
1204.3 M⊕
Eq. Temp
—
HD 128311 and Its Two Planets
HD 128311 is a K0 star 53.3 light-years away with two planets, both found by the radial velocity method. That method measures the wobble a planet's gravity induces in its star's motion, and repeated wobbles reveal the planet and its orbital period. The star is 0.83 solar masses, 0.76 solar radii, and 4970 K, with an age of 6.4 billion years. Its mass and radius are smaller than the Sun's, and its temperature is cooler.
HD 128311 b was discovered in 2002, has a minimum mass of 562 Earth masses, and orbits every 453 days. Its minimum mass is larger than Earth's and roughly 1.77 times Jupiter's mass. HD 128311 c was discovered in 2005, has a mass of 1200 Earth masses, and orbits every 922 days. Its mass is larger than Earth's and roughly 3.79 times Jupiter's. Among the listed planets, b has the shortest year, at 453 days, and c the longest, at 922 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
20
Stellar refs
20
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agedisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 4863.5 | — | 0.78 | — | -0.51 | — | 16.33 | Gaia DR2 | TICv8 |
| — | 0.83 | 0.76 | 0.96 | — | — | 16.33 | Takeda et al. 2007 | TICv8 |
| — | — | — | — | — | K3- V | 16.33 | Gray et al. 2003 | TICv8 |
| 5120 | 0.80 | 0.66 | 1 | -0.57 | — | 16.33 | Ghezzi et al. 2010 | TICv8 |
| — | 0.83 | — | — | — | — | 16.33 | Rein 2015 | TICv8 |
| — | — | — | — | — | — | 16.33 | Wright et al. 2004 | TICv8 |
| 4917 | 0.81 | 0.76 | — | -0.52 | — | 16.33 | TICv8 | TICv8 |
| 4835 | 0.61 | — | — | — | — | 16.33 | Santos et al. 2004 | TICv8 |
| — | — | — | — | — | K0 | 16.33 | Cannon & Pickering 1918 | TICv8 |
| 4931.9 | 0.84 | 0.78 | — | — | — | 16.33 | Rosenthal et al. 2021 | TICv8 |
| — | — | — | — | — | — | 16.33 | Nidever et al. 2002 | TICv8 |
| 4965 | 0.83 | 0.76 | 6.40 | -0.49 | K0 | 16.33 | Turnbull 2015 | TICv8 |
| 4950 | 0.76 | — | — | — | — | 16.33 | Santos et al. 2003 | TICv8 |
| — | 0.80 | — | — | — | K0 V | 16.33 | Butler et al. 2003 | TICv8 |
| — | 0.83 | 0.76 | 0.96 | — | — | 16.33 | McArthur et al. 2014 | TICv8 |
| 4983 | — | — | — | — | — | 16.33 | Maldonado et al. 2015 | TICv8 |
| 4965 | 0.83 | — | — | — | K0 | 16.33 | Wittenmyer et al. 2009 | TICv8 |
| — | 0.84 | — | 0.75 | — | K0 V | 16.33 | Vogt et al. 2005 | TICv8 |
| — | — | — | 0.74 | — | — | 16.33 | Sanz-Forcada et al. 2010 | TICv8 |
| — | — | — | — | — | — | 16.33 | Valenti & Fischer 2005 | TICv8 |