Temperature
4795 K
4745 to 4844.3
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Stellar HostProfile
HD 20868
K3/4 IV • 47.72 pc
Records
7
literature rows
Planets
1
system count
References
8
distinct source labels
HIP: HIP 15578TIC: TIC 142851295HD: HD 20868
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: Moutou et al. 2009 • System source: TICv8
Mass
0.78 Msun
0.39 to 0.78
Radius
0.79 Rsun
0.75 to 0.79
Age
4.50 Gyr
single adopted value
Luminosity
-0.53 log(Lsun)
-0.56 to -0.53
Distance
47.72 pc
single adopted value
Spectral Type
K3/4 IV
Multiple classifications reported
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.79 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
HD 20868
0.79 R☉
System Layout
Known planets
1 planets linked to this host
HD 20868 b
Radial Velocity
◌
Discovery
2008
Period
380.9 days
Radius
—
Mass
397.3 M⊕
Eq. Temp
—
HD 20868 and Its Planet
HD 20868 is a K3/4 IV star 156 light-years away with one known planet. It is 4.5 billion years old, has 0.78 solar masses, 0.79 solar radii, and a temperature of 4800 K. Its mass, radius, and temperature are each smaller or cooler than the Sun's.
HD 20868 b was discovered in 2008 by the radial velocity method, which detects the wobble a planet's gravity induces in its star's motion. The planet's minimum mass is 397 Earth masses, larger than Earth's, and its orbital period is 381 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
7
Stellar refs
7
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 |
|---|---|---|---|---|---|---|---|---|
| 4795 | 0.78 | 0.79 | 4.50 | -0.53 | K3/4 IV | 47.72 | Moutou et al. 2009 | TICv8 |
| 4745 | — | — | — | — | — | 47.72 | Tsantaki et al. 2014 | TICv8 |
| — | — | — | — | — | K3/4 III/V | 47.72 | Michigan Catalog, Vol. 3 | TICv8 |
| 4802 | 0.39 | 0.76 | — | — | — | 47.72 | Stassun et al. 2017 | TICv8 |
| — | — | — | — | — | K0 | 47.72 | Cannon & Pickering 1918 | TICv8 |
| 4802 | 0.78 | 0.77 | — | -0.55 | — | 47.72 | TICv8 | TICv8 |
| 4844.3 | — | 0.75 | — | -0.56 | — | 47.72 | Gaia DR2 | TICv8 |