Temperature
4785 K
4734 to 4845
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Stellar HostProfile
81 Cet
G5 III • 101.3 pc
Records
8
literature rows
Planets
1
system count
References
9
distinct source labels
TIC: TIC 35725282HD: HD 16400HIP: HIP 12247
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: Sato et al. 2008 • System source: TICv8
Mass
2.40 Msun
1.23 to 2.40
Radius
11 Rsun
11 to 11.43
Luminosity
1.78 log(Lsun)
1.76 to 1.81
Distance
101.3 pc
single adopted value
Spectral Type
G5 III
Multiple classifications reported
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 11 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
81 Cet
11 R☉
System Layout
Known planets
1 planets linked to this host
81 Cet b
Radial Velocity
◌
Discovery
2008
Period
1005.6 days
Radius
—
Mass
1051.1 M⊕
Eq. Temp
—
81 Cet and Its Giant Planet
81 Cet is a G5 III star 330 light-years from Earth, and it hosts one known planet. The star's reported mass estimate is 2.4 solar masses, and its reported radius estimate is 11 solar radii. Its temperature is 4790 K, cooler than the Sun's.
The planet, 81 Cet b, was discovered in 2008 by the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion. It has a minimum mass of 1050 Earth masses, a lower bound on its true mass that is larger than Earth's and roughly 3.31 times Jupiter's mass. Its orbital period is 1010 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
8
Stellar refs
8
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 4829.8 | — | 11.43 | — | 1.81 | — | 101.3 | Gaia DR2 | TICv8 |
| 4734 | 1.23 | 11.21 | — | 1.76 | G5 III | 101.3 | Teng et al. 2023 | TICv8 |
| — | 1.60 | — | — | — | — | 101.3 | Kunitomo et al. 2011 | TICv8 |
| — | — | — | — | — | K0 | 101.3 | Cannon & Pickering 1918 | TICv8 |
| 4844.3 | — | 11.29 | — | — | — | 101.3 | TICv8 | TICv8 |
| 4785 | 2.40 | 11 | — | 1.78 | G5 III | 101.3 | Sato et al. 2008 | TICv8 |
| — | — | — | — | — | K0 III | 101.3 | Michigan Catalog, Vol. 5 | TICv8 |
| 4845 | 1.74 | — | — | — | — | 101.3 | Mortier et al. 2013 | TICv8 |