Temperature
4915 K
4843.4 to 4962
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Stellar HostProfile
HD 181433
Unclassified star • 26.88 pc
Records
15
literature rows
Planets
3
system count
References
15
distinct source labels
TIC: TIC 410399074HD: HD 181433HIP: HIP 95467
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: Ghezzi et al. 2010 • System source: TICv8
Mass
0.90 Msun
0.63 to 0.90
Radius
0.78 Rsun
0.78 to 0.85
Age
2 Gyr
2 to 6.70
Luminosity
-0.50 log(Lsun)
-0.51 to -0.44
Distance
26.88 pc
single adopted value
Planets
3
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.78 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
HD 181433
0.78 R☉
System Layout
Known planets
3 planets linked to this host
HD 181433 b
Radial Velocity
◌
Discovery
2008
Period
9.37 days
Radius
—
Mass
7.22 M⊕
Eq. Temp
—
HD 181433 c
Radial Velocity
◌
Discovery
2008
Period
1018.5 days
Radius
—
Mass
235.5 M⊕
Eq. Temp
—
HD 181433 d
Radial Velocity
◌
Discovery
2008
Period
6896.1 days
Radius
—
Mass
206.9 M⊕
Eq. Temp
—
HD 181433: A K-Type Star and Its Three Worlds
HD 181433 is a K2IV/V star located 87.7 light-years away. This star has three known planets. The star is roughly 2 billion years old, with a mass of 0.9 solar masses, a radius of 0.78 solar radii, and a temperature of 4920 K. Its reported radius is smaller than the Sun's, and its temperature is cooler than the Sun's.
All three planets were discovered in 2008 using the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion; repeated wobbles reveal the planet and its orbital period.
HD 181433 b has a minimum mass of 7.22 Earth masses and an orbital period of 9.37 days. Among the listed planets, it has the shortest year and the smallest minimum mass.
HD 181433 c has a minimum mass of 236 Earth masses and an orbital period of 1020 days. Among the listed planets, it has the second-shortest year and the largest minimum mass.
HD 181433 d has a minimum mass of 207 Earth masses and an orbital period of 6900 days. Among the listed planets, it has the longest year and the second-smallest minimum mass.
Each planet's minimum mass is larger than Earth's. A minimum mass is a lower bound on a planet's true mass, differing from an ordinary mass estimate.
Provenance
Underlying measurements and references
Evidence Summary
Rows
15
Stellar refs
14
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 |
|---|---|---|---|---|---|---|---|---|
| — | — | — | — | — | K3 III-IV | 26.88 | Gray et al. 2006 | TICv8 |
| — | — | — | — | — | K2 IV/V | 26.88 | Michigan Catalog, Vol. 1 | TICv8 |
| 4900 | 0.77 | 0.83 | — | -0.44 | K2IV/V | 26.88 | Turnbull 2015 | TICv8 |
| 4962 | 0.78 | — | — | -0.51 | K3 IV | 26.88 | Bouchy et al. 2009 | TICv8 |
| — | — | — | — | — | — | 26.88 | Nordstrom et al. 2004 | TICv8 |
| 4962 | 0.78 | — | — | -0.51 | — | 26.88 | Sousa et al. 2008 | TICv8 |
| 4915 | 0.90 | 0.78 | 2 | -0.50 | — | 26.88 | Ghezzi et al. 2010 | TICv8 |
| — | 0.86 | — | — | — | — | 26.88 | Standing et al. 2026 | TICv8 |
| — | 0.87 | — | — | — | — | 26.88 | An et al. 2025 | TICv8 |
| — | — | — | — | — | K2 | 26.88 | Cannon & Pickering 1918 | TICv8 |
| 4843.4 | — | 0.85 | — | -0.45 | — | 26.88 | Gaia DR2 | TICv8 |
| — | 0.87 | — | — | — | — | 26.88 | An et al. 2025 | TICv8 |
| 4918 | 0.63 | 0.79 | — | — | — | 26.88 | Stassun et al. 2017 | TICv8 |
| 4929.6 | 0.81 | 0.81 | — | -0.46 | — | 26.88 | TICv8 | TICv8 |
| 4962 | 0.78 | — | 6.70 | -0.51 | — | 26.88 | Horner et al. 2019 | TICv8 |